Merge tag 'char-misc-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here's the big char/misc driver patchset for 4.1-rc1.

  Lots of different driver subsystem updates here, nothing major, full
  details are in the shortlog.

  All of this has been in linux-next for a while"

* tag 'char-misc-4.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (133 commits)
  mei: trace: remove unused TRACE_SYSTEM_STRING
  DTS: ARM: OMAP3-N900: Add lis3lv02d support
  Documentation: DT: lis302: update wakeup binding
  lis3lv02d: DT: add wakeup unit 2 and wakeup threshold
  lis3lv02d: DT: use s32 to support negative values
  Drivers: hv: hv_balloon: correctly handle num_pages>INT_MAX case
  Drivers: hv: hv_balloon: correctly handle val.freeram<num_pages case
  mei: replace check for connection instead of transitioning
  mei: use mei_cl_is_connected consistently
  mei: fix mei_poll operation
  hv_vmbus: Add gradually increased delay for retries in vmbus_post_msg()
  Drivers: hv: hv_balloon: survive ballooning request with num_pages=0
  Drivers: hv: hv_balloon: eliminate jumps in piecewiese linear floor function
  Drivers: hv: hv_balloon: do not online pages in offline blocks
  hv: remove the per-channel workqueue
  hv: don't schedule new works in vmbus_onoffer()/vmbus_onoffer_rescind()
  hv: run non-blocking message handlers in the dispatch tasklet
  coresight: moving to new "hwtracing" directory
  coresight-tmc: Adding a status interface to sysfs
  coresight: remove the unnecessary configuration coresight-default-sink
  ...

91 files changed, 3605 insertions, 1399 deletions

diff --git a/drivers/Makefile b/drivers/Makefile
index 527a6da8d539..46d2554be404 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -163,5 +163,5 @@ obj-$(CONFIG_POWERCAP)		+= powercap/
 obj-$(CONFIG_MCB)		+= mcb/
 obj-$(CONFIG_RAS)		+= ras/
 obj-$(CONFIG_THUNDERBOLT)	+= thunderbolt/
-obj-$(CONFIG_CORESIGHT)		+= coresight/
+obj-$(CONFIG_CORESIGHT)		+= hwtracing/coresight/
 obj-$(CONFIG_ANDROID)		+= android/
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 571ef61f8ea9..da8faf78536a 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -300,11 +300,14 @@ static const struct file_operations rng_chrdev_ops = {
 	.llseek		= noop_llseek,
 };
 
+static const struct attribute_group *rng_dev_groups[];
+
 static struct miscdevice rng_miscdev = {
 	.minor		= RNG_MISCDEV_MINOR,
 	.name		= RNG_MODULE_NAME,
 	.nodename	= "hwrng",
 	.fops		= &rng_chrdev_ops,
+	.groups		= rng_dev_groups,
 };
 
 
@@ -377,37 +380,22 @@ static DEVICE_ATTR(rng_available, S_IRUGO,
 		   hwrng_attr_available_show,
 		   NULL);
 
+static struct attribute *rng_dev_attrs[] = {
+	&dev_attr_rng_current.attr,
+	&dev_attr_rng_available.attr,
+	NULL
+};
+
+ATTRIBUTE_GROUPS(rng_dev);
 
 static void __exit unregister_miscdev(void)
 {
-	device_remove_file(rng_miscdev.this_device, &dev_attr_rng_available);
-	device_remove_file(rng_miscdev.this_device, &dev_attr_rng_current);
 	misc_deregister(&rng_miscdev);
 }
 
 static int __init register_miscdev(void)
 {
-	int err;
-
-	err = misc_register(&rng_miscdev);
-	if (err)
-		goto out;
-	err = device_create_file(rng_miscdev.this_device,
-				 &dev_attr_rng_current);
-	if (err)
-		goto err_misc_dereg;
-	err = device_create_file(rng_miscdev.this_device,
-				 &dev_attr_rng_available);
-	if (err)
-		goto err_remove_current;
-out:
-	return err;
-
-err_remove_current:
-	device_remove_file(rng_miscdev.this_device, &dev_attr_rng_current);
-err_misc_dereg:
-	misc_deregister(&rng_miscdev);
-	goto out;
+	return misc_register(&rng_miscdev);
 }
 
 static int hwrng_fillfn(void *unused)
diff --git a/drivers/char/hw_random/pasemi-rng.c b/drivers/char/hw_random/pasemi-rng.c
index 3eb7bdd7f93b..51cb1d5cc489 100644
--- a/drivers/char/hw_random/pasemi-rng.c
+++ b/drivers/char/hw_random/pasemi-rng.c
@@ -133,7 +133,7 @@ static int rng_remove(struct platform_device *dev)
 	return 0;
 }
 
-static struct of_device_id rng_match[] = {
+static const struct of_device_id rng_match[] = {
 	{ .compatible      = "1682m-rng", },
 	{ .compatible      = "pasemi,pwrficient-rng", },
 	{ },
diff --git a/drivers/char/hw_random/powernv-rng.c b/drivers/char/hw_random/powernv-rng.c
index 3f4f63204560..263a5bb8e605 100644
--- a/drivers/char/hw_random/powernv-rng.c
+++ b/drivers/char/hw_random/powernv-rng.c
@@ -61,7 +61,7 @@ static int powernv_rng_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static struct of_device_id powernv_rng_match[] = {
+static const struct of_device_id powernv_rng_match[] = {
 	{ .compatible	= "ibm,power-rng",},
 	{},
 };
diff --git a/drivers/char/hw_random/ppc4xx-rng.c b/drivers/char/hw_random/ppc4xx-rng.c
index c85d31a5f9e3..b2cfda0fa93e 100644
--- a/drivers/char/hw_random/ppc4xx-rng.c
+++ b/drivers/char/hw_random/ppc4xx-rng.c
@@ -123,7 +123,7 @@ static int ppc4xx_rng_remove(struct platform_device *dev)
 	return 0;
 }
 
-static struct of_device_id ppc4xx_rng_match[] = {
+static const struct of_device_id ppc4xx_rng_match[] = {
 	{ .compatible = "ppc4xx-rng", },
 	{ .compatible = "amcc,ppc460ex-rng", },
 	{ .compatible = "amcc,ppc440epx-rng", },
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 24cc4ed9a780..a43048b5b05f 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -510,13 +510,15 @@ static int i8k_proc_show(struct seq_file *seq, void *offset)
 	 * 9)  AC power
 	 * 10) Fn Key status
 	 */
-	return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
-			  I8K_PROC_FMT,
-			  bios_version,
-			  i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
-			  cpu_temp,
-			  left_fan, right_fan, left_speed, right_speed,
-			  ac_power, fn_key);
+	seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
+		   I8K_PROC_FMT,
+		   bios_version,
+		   i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+		   cpu_temp,
+		   left_fan, right_fan, left_speed, right_speed,
+		   ac_power, fn_key);
+
+	return 0;
 }
 
 static int i8k_open_fs(struct inode *inode, struct file *file)
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 518585c1ce94..5e90a18afbaf 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2667,7 +2667,7 @@ static struct pci_driver ipmi_pci_driver = {
 };
 #endif /* CONFIG_PCI */
 
-static struct of_device_id ipmi_match[];
+static const struct of_device_id ipmi_match[];
 static int ipmi_probe(struct platform_device *dev)
 {
 #ifdef CONFIG_OF
@@ -2764,7 +2764,7 @@ static int ipmi_remove(struct platform_device *dev)
 	return 0;
 }
 
-static struct of_device_id ipmi_match[] =
+static const struct of_device_id ipmi_match[] =
 {
 	{ .type = "ipmi", .compatible = "ipmi-kcs",
 	  .data = (void *)(unsigned long) SI_KCS },
diff --git a/drivers/char/misc.c b/drivers/char/misc.c
index ffa97d261cf3..9fd5a91e0d81 100644
--- a/drivers/char/misc.c
+++ b/drivers/char/misc.c
@@ -140,12 +140,17 @@ static int misc_open(struct inode * inode, struct file * file)
 			goto fail;
 	}
 
+	/*
+	 * Place the miscdevice in the file's
+	 * private_data so it can be used by the
+	 * file operations, including f_op->open below
+	 */
+	file->private_data = c;
+
 	err = 0;
 	replace_fops(file, new_fops);
-	if (file->f_op->open) {
-		file->private_data = c;
+	if (file->f_op->open)
 		err = file->f_op->open(inode,file);
-	}
 fail:
 	mutex_unlock(&misc_mtx);
 	return err;
@@ -169,7 +174,9 @@ static const struct file_operations misc_fops = {
  *	the minor number requested is used.
  *
  *	The structure passed is linked into the kernel and may not be
- *	destroyed until it has been unregistered.
+ *	destroyed until it has been unregistered. By default, an open()
+ *	syscall to the device sets file->private_data to point to the
+ *	structure. Drivers don't need open in fops for this.
  *
  *	A zero is returned on success and a negative errno code for
  *	failure.
@@ -205,8 +212,9 @@ int misc_register(struct miscdevice * misc)
 
 	dev = MKDEV(MISC_MAJOR, misc->minor);
 
-	misc->this_device = device_create(misc_class, misc->parent, dev,
-					  misc, "%s", misc->name);
+	misc->this_device =
+		device_create_with_groups(misc_class, misc->parent, dev,
+					  misc, misc->groups, "%s", misc->name);
 	if (IS_ERR(misc->this_device)) {
 		int i = DYNAMIC_MINORS - misc->minor - 1;
 		if (i < DYNAMIC_MINORS && i >= 0)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 72d7028f779b..50754d203310 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -355,7 +355,7 @@ static inline bool use_multiport(struct ports_device *portdev)
 	 * early_init
 	 */
 	if (!portdev->vdev)
-		return 0;
+		return false;
 	return __virtio_test_bit(portdev->vdev, VIRTIO_CONSOLE_F_MULTIPORT);
 }
 
diff --git a/drivers/char/xillybus/xillybus_core.c b/drivers/char/xillybus/xillybus_core.c
index b827fa095f1b..77d6c127e691 100644
--- a/drivers/char/xillybus/xillybus_core.c
+++ b/drivers/char/xillybus/xillybus_core.c
@@ -1237,6 +1237,8 @@ static ssize_t xillybus_write(struct file *filp, const char __user *userbuf,
 					unsigned char *tail;
 					int i;
 
+					howmany = 0;
+
 					end_offset_plus1 = bufpos >>
 						channel->log2_element_size;
 
diff --git a/drivers/char/xillybus/xillybus_of.c b/drivers/char/xillybus/xillybus_of.c
index 2002a3a28146..781865084dc1 100644
--- a/drivers/char/xillybus/xillybus_of.c
+++ b/drivers/char/xillybus/xillybus_of.c
@@ -31,7 +31,7 @@ MODULE_LICENSE("GPL v2");
 static const char xillyname[] = "xillybus_of";
 
 /* Match table for of_platform binding */
-static struct of_device_id xillybus_of_match[] = {
+static const struct of_device_id xillybus_of_match[] = {
 	{ .compatible = "xillybus,xillybus-1.00.a", },
 	{ .compatible = "xlnx,xillybus-1.00.a", }, /* Deprecated */
 	{}
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 6a1f7de6fa54..fdc0bf0543ce 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -55,6 +55,16 @@ config EXTCON_MAX77693
 	  Maxim MAX77693 PMIC. The MAX77693 MUIC is a USB port accessory
 	  detector and switch.
 
+config EXTCON_MAX77843
+	tristate "MAX77843 EXTCON Support"
+	depends on MFD_MAX77843
+	select IRQ_DOMAIN
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the MUIC device of
+	  Maxim MAX77843. The MAX77843 MUIC is a USB port accessory
+	  detector add switch.
+
 config EXTCON_MAX8997
 	tristate "MAX8997 EXTCON Support"
 	depends on MFD_MAX8997 && IRQ_DOMAIN
@@ -93,4 +103,11 @@ config EXTCON_SM5502
 	  Silicon Mitus SM5502. The SM5502 is a USB port accessory
 	  detector and switch.
 
+config EXTCON_USB_GPIO
+	tristate "USB GPIO extcon support"
+	depends on GPIOLIB
+	help
+	  Say Y here to enable GPIO based USB cable detection extcon support.
+	  Used typically if GPIO is used for USB ID pin detection.
+
 endif # MULTISTATE_SWITCH
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 0370b42e5a27..9204114791a3 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -2,13 +2,15 @@
 # Makefile for external connector class (extcon) devices
 #
 
-obj-$(CONFIG_EXTCON)		+= extcon-class.o
+obj-$(CONFIG_EXTCON)		+= extcon.o
 obj-$(CONFIG_EXTCON_ADC_JACK)	+= extcon-adc-jack.o
 obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o
 obj-$(CONFIG_EXTCON_GPIO)	+= extcon-gpio.o
 obj-$(CONFIG_EXTCON_MAX14577)	+= extcon-max14577.o
 obj-$(CONFIG_EXTCON_MAX77693)	+= extcon-max77693.o
+obj-$(CONFIG_EXTCON_MAX77843)	+= extcon-max77843.o
 obj-$(CONFIG_EXTCON_MAX8997)	+= extcon-max8997.o
 obj-$(CONFIG_EXTCON_PALMAS)	+= extcon-palmas.o
 obj-$(CONFIG_EXTCON_RT8973A)	+= extcon-rt8973a.o
 obj-$(CONFIG_EXTCON_SM5502)	+= extcon-sm5502.o
+obj-$(CONFIG_EXTCON_USB_GPIO)	+= extcon-usb-gpio.o
diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index 6b5e795f3fe2..a0ed35b336e4 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -136,18 +136,35 @@ static const char *arizona_cable[] = {
 
 static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info);
 
-static void arizona_extcon_do_magic(struct arizona_extcon_info *info,
-				    unsigned int magic)
+static void arizona_extcon_hp_clamp(struct arizona_extcon_info *info,
+				    bool clamp)
 {
 	struct arizona *arizona = info->arizona;
+	unsigned int mask = 0, val = 0;
 	int ret;
 
+	switch (arizona->type) {
+	case WM5110:
+		mask = ARIZONA_HP1L_SHRTO | ARIZONA_HP1L_FLWR |
+		       ARIZONA_HP1L_SHRTI;
+		if (clamp)
+			val = ARIZONA_HP1L_SHRTO;
+		else
+			val = ARIZONA_HP1L_FLWR | ARIZONA_HP1L_SHRTI;
+		break;
+	default:
+		mask = ARIZONA_RMV_SHRT_HP1L;
+		if (clamp)
+			val = ARIZONA_RMV_SHRT_HP1L;
+		break;
+	};
+
 	mutex_lock(&arizona->dapm->card->dapm_mutex);
 
-	arizona->hpdet_magic = magic;
+	arizona->hpdet_clamp = clamp;
 
-	/* Keep the HP output stages disabled while doing the magic */
-	if (magic) {
+	/* Keep the HP output stages disabled while doing the clamp */
+	if (clamp) {
 		ret = regmap_update_bits(arizona->regmap,
 					 ARIZONA_OUTPUT_ENABLES_1,
 					 ARIZONA_OUT1L_ENA |
@@ -158,20 +175,20 @@ static void arizona_extcon_do_magic(struct arizona_extcon_info *info,
 				 ret);
 	}
 
-	ret = regmap_update_bits(arizona->regmap, 0x225, 0x4000,
-				 magic);
+	ret = regmap_update_bits(arizona->regmap, ARIZONA_HP_CTRL_1L,
+				 mask, val);
 	if (ret != 0)
-		dev_warn(arizona->dev, "Failed to do magic: %d\n",
+		dev_warn(arizona->dev, "Failed to do clamp: %d\n",
 				 ret);
 
-	ret = regmap_update_bits(arizona->regmap, 0x226, 0x4000,
-				 magic);
+	ret = regmap_update_bits(arizona->regmap, ARIZONA_HP_CTRL_1R,
+				 mask, val);
 	if (ret != 0)
-		dev_warn(arizona->dev, "Failed to do magic: %d\n",
+		dev_warn(arizona->dev, "Failed to do clamp: %d\n",
 			 ret);
 
-	/* Restore the desired state while not doing the magic */
-	if (!magic) {
+	/* Restore the desired state while not doing the clamp */
+	if (!clamp) {
 		ret = regmap_update_bits(arizona->regmap,
 					 ARIZONA_OUTPUT_ENABLES_1,
 					 ARIZONA_OUT1L_ENA |
@@ -603,7 +620,7 @@ done:
 			   ARIZONA_HP_IMPEDANCE_RANGE_MASK | ARIZONA_HP_POLL,
 			   0);
 
-	arizona_extcon_do_magic(info, 0);
+	arizona_extcon_hp_clamp(info, false);
 
 	if (id_gpio)
 		gpio_set_value_cansleep(id_gpio, 0);
@@ -648,7 +665,7 @@ static void arizona_identify_headphone(struct arizona_extcon_info *info)
 	if (info->mic)
 		arizona_stop_mic(info);
 
-	arizona_extcon_do_magic(info, 0x4000);
+	arizona_extcon_hp_clamp(info, true);
 
 	ret = regmap_update_bits(arizona->regmap,
 				 ARIZONA_ACCESSORY_DETECT_MODE_1,
@@ -699,7 +716,7 @@ static void arizona_start_hpdet_acc_id(struct arizona_extcon_info *info)
 
 	info->hpdet_active = true;
 
-	arizona_extcon_do_magic(info, 0x4000);
+	arizona_extcon_hp_clamp(info, true);
 
 	ret = regmap_update_bits(arizona->regmap,
 				 ARIZONA_ACCESSORY_DETECT_MODE_1,
diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c
index c1bf0cf747b0..3823aa4a3a80 100644
--- a/drivers/extcon/extcon-max14577.c
+++ b/drivers/extcon/extcon-max14577.c
@@ -539,8 +539,6 @@ static void max14577_muic_irq_work(struct work_struct *work)
 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
 
 	mutex_unlock(&info->mutex);
-
-	return;
 }
 
 /*
@@ -730,8 +728,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
 				muic_irq->name, info);
 		if (ret) {
 			dev_err(&pdev->dev,
-				"failed: irq request (IRQ: %d,"
-				" error :%d)\n",
+				"failed: irq request (IRQ: %d, error :%d)\n",
 				muic_irq->irq, ret);
 			return ret;
 		}
diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index af165fd0c6f5..a66bec8f6252 100644
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -190,8 +190,8 @@ enum max77693_muic_acc_type {
 	/* The below accessories have same ADC value so ADCLow and
 	   ADC1K bit is used to separate specific accessory */
 						/* ADC|VBVolot|ADCLow|ADC1K| */
-	MAX77693_MUIC_GND_USB_OTG = 0x100,	/* 0x0|      0|     0|    0| */
-	MAX77693_MUIC_GND_USB_OTG_VB = 0x104,	/* 0x0|      1|     0|    0| */
+	MAX77693_MUIC_GND_USB_HOST = 0x100,	/* 0x0|      0|     0|    0| */
+	MAX77693_MUIC_GND_USB_HOST_VB = 0x104,	/* 0x0|      1|     0|    0| */
 	MAX77693_MUIC_GND_AV_CABLE_LOAD = 0x102,/* 0x0|      0|     1|    0| */
 	MAX77693_MUIC_GND_MHL = 0x103,		/* 0x0|      0|     1|    1| */
 	MAX77693_MUIC_GND_MHL_VB = 0x107,	/* 0x0|      1|     1|    1| */
@@ -228,7 +228,7 @@ static const char *max77693_extcon_cable[] = {
 	[EXTCON_CABLE_SLOW_CHARGER]		= "Slow-charger",
 	[EXTCON_CABLE_CHARGE_DOWNSTREAM]	= "Charge-downstream",
 	[EXTCON_CABLE_MHL]			= "MHL",
-	[EXTCON_CABLE_MHL_TA]			= "MHL_TA",
+	[EXTCON_CABLE_MHL_TA]			= "MHL-TA",
 	[EXTCON_CABLE_JIG_USB_ON]		= "JIG-USB-ON",
 	[EXTCON_CABLE_JIG_USB_OFF]		= "JIG-USB-OFF",
 	[EXTCON_CABLE_JIG_UART_OFF]		= "JIG-UART-OFF",
@@ -403,8 +403,8 @@ static int max77693_muic_get_cable_type(struct max77693_muic_info *info,
 
 			/**
 			 * [0x1|VBVolt|ADCLow|ADC1K]
-			 * [0x1|     0|     0|    0] USB_OTG
-			 * [0x1|     1|     0|    0] USB_OTG_VB
+			 * [0x1|     0|     0|    0] USB_HOST
+			 * [0x1|     1|     0|    0] USB_HSOT_VB
 			 * [0x1|     0|     1|    0] Audio Video cable with load
 			 * [0x1|     0|     1|    1] MHL without charging cable
 			 * [0x1|     1|     1|    1] MHL with charging cable
@@ -523,7 +523,7 @@ static int max77693_muic_dock_handler(struct max77693_muic_info *info,
 		 * - Support charging and data connection through micro-usb port
 		 *           if USB cable is connected between target and host
 		 *	     device.
-		 * - Support OTG device (Mouse/Keyboard)
+		 * - Support OTG(On-The-Go) device (Ex: Mouse/Keyboard)
 		 */
 		ret = max77693_muic_set_path(info, info->path_usb, attached);
 		if (ret < 0)
@@ -609,9 +609,9 @@ static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)
 				MAX77693_CABLE_GROUP_ADC_GND, &attached);
 
 	switch (cable_type_gnd) {
-	case MAX77693_MUIC_GND_USB_OTG:
-	case MAX77693_MUIC_GND_USB_OTG_VB:
-		/* USB_OTG, PATH: AP_USB */
+	case MAX77693_MUIC_GND_USB_HOST:
+	case MAX77693_MUIC_GND_USB_HOST_VB:
+		/* USB_HOST, PATH: AP_USB */
 		ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
 		if (ret < 0)
 			return ret;
@@ -704,7 +704,7 @@ static int max77693_muic_adc_handler(struct max77693_muic_info *info)
 
 	switch (cable_type) {
 	case MAX77693_MUIC_ADC_GROUND:
-		/* USB_OTG/MHL/Audio */
+		/* USB_HOST/MHL/Audio */
 		max77693_muic_adc_ground_handler(info);
 		break;
 	case MAX77693_MUIC_ADC_FACTORY_MODE_USB_OFF:
@@ -823,19 +823,19 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info)
 		case MAX77693_MUIC_GND_MHL:
 		case MAX77693_MUIC_GND_MHL_VB:
 			/*
-			 * MHL cable with MHL_TA(USB/TA) cable
+			 * MHL cable with MHL-TA(USB/TA) cable
 			 * - MHL cable include two port(HDMI line and separate
 			 * micro-usb port. When the target connect MHL cable,
-			 * extcon driver check whether MHL_TA(USB/TA) cable is
-			 * connected. If MHL_TA cable is connected, extcon
+			 * extcon driver check whether MHL-TA(USB/TA) cable is
+			 * connected. If MHL-TA cable is connected, extcon
 			 * driver notify state to notifiee for charging battery.
 			 *
-			 * Features of 'MHL_TA(USB/TA) with MHL cable'
+			 * Features of 'MHL-TA(USB/TA) with MHL cable'
 			 * - Support MHL
 			 * - Support charging through micro-usb port without
 			 *   data connection
 			 */
-			extcon_set_cable_state(info->edev, "MHL_TA", attached);
+			extcon_set_cable_state(info->edev, "MHL-TA", attached);
 			if (!cable_attached)
 				extcon_set_cable_state(info->edev,
 						      "MHL", cable_attached);
@@ -886,7 +886,7 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info)
 			 * - Support charging and data connection through micro-
 			 *   usb port if USB cable is connected between target
 			 *   and host device
-			 * - Support OTG device (Mouse/Keyboard)
+			 * - Support OTG(On-The-Go) device (Ex: Mouse/Keyboard)
 			 */
 			ret = max77693_muic_set_path(info, info->path_usb,
 						    attached);
@@ -1019,8 +1019,6 @@ static void max77693_muic_irq_work(struct work_struct *work)
 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
 
 	mutex_unlock(&info->mutex);
-
-	return;
 }
 
 static irqreturn_t max77693_muic_irq_handler(int irq, void *data)
@@ -1171,8 +1169,7 @@ static int max77693_muic_probe(struct platform_device *pdev)
 				muic_irq->name, info);
 		if (ret) {
 			dev_err(&pdev->dev,
-				"failed: irq request (IRQ: %d,"
-				" error :%d)\n",
+				"failed: irq request (IRQ: %d, error :%d)\n",
 				muic_irq->irq, ret);
 			return ret;
 		}
diff --git a/drivers/extcon/extcon-max77843.c b/drivers/extcon/extcon-max77843.c
new file mode 100644
index 000000000000..8db6a926ea07
--- /dev/null
+++ b/drivers/extcon/extcon-max77843.c
@@ -0,0 +1,881 @@
+/*
+ * extcon-max77843.c - Maxim MAX77843 extcon driver to support
+ *			MUIC(Micro USB Interface Controller)
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ * Author: Jaewon Kim <jaewon02.kim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/extcon.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/max77843-private.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+#define DELAY_MS_DEFAULT		15000	/* unit: millisecond */
+
+enum max77843_muic_status {
+	MAX77843_MUIC_STATUS1 = 0,
+	MAX77843_MUIC_STATUS2,
+	MAX77843_MUIC_STATUS3,
+
+	MAX77843_MUIC_STATUS_NUM,
+};
+
+struct max77843_muic_info {
+	struct device *dev;
+	struct max77843 *max77843;
+	struct extcon_dev *edev;
+
+	struct mutex mutex;
+	struct work_struct irq_work;
+	struct delayed_work wq_detcable;
+
+	u8 status[MAX77843_MUIC_STATUS_NUM];
+	int prev_cable_type;
+	int prev_chg_type;
+	int prev_gnd_type;
+
+	bool irq_adc;
+	bool irq_chg;
+};
+
+enum max77843_muic_cable_group {
+	MAX77843_CABLE_GROUP_ADC = 0,
+	MAX77843_CABLE_GROUP_ADC_GND,
+	MAX77843_CABLE_GROUP_CHG,
+};
+
+enum max77843_muic_adc_debounce_time {
+	MAX77843_DEBOUNCE_TIME_5MS = 0,
+	MAX77843_DEBOUNCE_TIME_10MS,
+	MAX77843_DEBOUNCE_TIME_25MS,
+	MAX77843_DEBOUNCE_TIME_38_62MS,
+};
+
+/* Define accessory cable type */
+enum max77843_muic_accessory_type {
+	MAX77843_MUIC_ADC_GROUND = 0,
+	MAX77843_MUIC_ADC_SEND_END_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
+	MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
+	MAX77843_MUIC_ADC_RESERVED_ACC_1,
+	MAX77843_MUIC_ADC_RESERVED_ACC_2,
+	MAX77843_MUIC_ADC_RESERVED_ACC_3,
+	MAX77843_MUIC_ADC_RESERVED_ACC_4,
+	MAX77843_MUIC_ADC_RESERVED_ACC_5,
+	MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
+	MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
+	MAX77843_MUIC_ADC_TTY_CONVERTER,
+	MAX77843_MUIC_ADC_UART_CABLE,
+	MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
+	MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
+	MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
+	MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
+	MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
+	MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
+	MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
+	MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
+	MAX77843_MUIC_ADC_OPEN,
+
+	/* The blow accessories should check
+	   not only ADC value but also ADC1K and VBVolt value. */
+						/* Offset|ADC1K|VBVolt| */
+	MAX77843_MUIC_GND_USB_HOST = 0x100,	/*    0x1|    0|     0| */
+	MAX77843_MUIC_GND_USB_HOST_VB = 0x101,	/*    0x1|    0|     1| */
+	MAX77843_MUIC_GND_MHL = 0x102,		/*    0x1|    1|     0| */
+	MAX77843_MUIC_GND_MHL_VB = 0x103,	/*    0x1|    1|     1| */
+};
+
+/* Define charger cable type */
+enum max77843_muic_charger_type {
+	MAX77843_MUIC_CHG_NONE = 0,
+	MAX77843_MUIC_CHG_USB,
+	MAX77843_MUIC_CHG_DOWNSTREAM,
+	MAX77843_MUIC_CHG_DEDICATED,
+	MAX77843_MUIC_CHG_SPECIAL_500MA,
+	MAX77843_MUIC_CHG_SPECIAL_1A,
+	MAX77843_MUIC_CHG_SPECIAL_BIAS,
+	MAX77843_MUIC_CHG_RESERVED,
+	MAX77843_MUIC_CHG_GND,
+};
+
+enum {
+	MAX77843_CABLE_USB = 0,
+	MAX77843_CABLE_USB_HOST,
+	MAX77843_CABLE_TA,
+	MAX77843_CABLE_CHARGE_DOWNSTREAM,
+	MAX77843_CABLE_FAST_CHARGER,
+	MAX77843_CABLE_SLOW_CHARGER,
+	MAX77843_CABLE_MHL,
+	MAX77843_CABLE_MHL_TA,
+	MAX77843_CABLE_JIG_USB_ON,
+	MAX77843_CABLE_JIG_USB_OFF,
+	MAX77843_CABLE_JIG_UART_ON,
+	MAX77843_CABLE_JIG_UART_OFF,
+
+	MAX77843_CABLE_NUM,
+};
+
+static const char *max77843_extcon_cable[] = {
+	[MAX77843_CABLE_USB]			= "USB",
+	[MAX77843_CABLE_USB_HOST]		= "USB-HOST",
+	[MAX77843_CABLE_TA]			= "TA",
+	[MAX77843_CABLE_CHARGE_DOWNSTREAM]	= "CHARGER-DOWNSTREAM",
+	[MAX77843_CABLE_FAST_CHARGER]		= "FAST-CHARGER",
+	[MAX77843_CABLE_SLOW_CHARGER]		= "SLOW-CHARGER",
+	[MAX77843_CABLE_MHL]			= "MHL",
+	[MAX77843_CABLE_MHL_TA]			= "MHL-TA",
+	[MAX77843_CABLE_JIG_USB_ON]		= "JIG-USB-ON",
+	[MAX77843_CABLE_JIG_USB_OFF]		= "JIG-USB-OFF",
+	[MAX77843_CABLE_JIG_UART_ON]		= "JIG-UART-ON",
+	[MAX77843_CABLE_JIG_UART_OFF]		= "JIG-UART-OFF",
+};
+
+struct max77843_muic_irq {
+	unsigned int irq;
+	const char *name;
+	unsigned int virq;
+};
+
+static struct max77843_muic_irq max77843_muic_irqs[] = {
+	{ MAX77843_MUIC_IRQ_INT1_ADC,		"MUIC-ADC" },
+	{ MAX77843_MUIC_IRQ_INT1_ADCERROR,	"MUIC-ADC_ERROR" },
+	{ MAX77843_MUIC_IRQ_INT1_ADC1K,		"MUIC-ADC1K" },
+	{ MAX77843_MUIC_IRQ_INT2_CHGTYP,	"MUIC-CHGTYP" },
+	{ MAX77843_MUIC_IRQ_INT2_CHGDETRUN,	"MUIC-CHGDETRUN" },
+	{ MAX77843_MUIC_IRQ_INT2_DCDTMR,	"MUIC-DCDTMR" },
+	{ MAX77843_MUIC_IRQ_INT2_DXOVP,		"MUIC-DXOVP" },
+	{ MAX77843_MUIC_IRQ_INT2_VBVOLT,	"MUIC-VBVOLT" },
+	{ MAX77843_MUIC_IRQ_INT3_VBADC,		"MUIC-VBADC" },
+	{ MAX77843_MUIC_IRQ_INT3_VDNMON,	"MUIC-VDNMON" },
+	{ MAX77843_MUIC_IRQ_INT3_DNRES,		"MUIC-DNRES" },
+	{ MAX77843_MUIC_IRQ_INT3_MPNACK,	"MUIC-MPNACK"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXBUFOW,	"MUIC-MRXBUFOW"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXTRF,	"MUIC-MRXTRF"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXPERR,	"MUIC-MRXPERR"},
+	{ MAX77843_MUIC_IRQ_INT3_MRXRDY,	"MUIC-MRXRDY"},
+};
+
+static const struct regmap_config max77843_muic_regmap_config = {
+	.reg_bits       = 8,
+	.val_bits       = 8,
+	.max_register   = MAX77843_MUIC_REG_END,
+};
+
+static const struct regmap_irq max77843_muic_irq[] = {
+	/* INT1 interrupt */
+	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
+	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
+	{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
+
+	/* INT2 interrupt */
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
+	{ .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
+
+	/* INT3 interrupt */
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
+	{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
+};
+
+static const struct regmap_irq_chip max77843_muic_irq_chip = {
+	.name           = "max77843-muic",
+	.status_base    = MAX77843_MUIC_REG_INT1,
+	.mask_base      = MAX77843_MUIC_REG_INTMASK1,
+	.mask_invert    = true,
+	.num_regs       = 3,
+	.irqs           = max77843_muic_irq,
+	.num_irqs       = ARRAY_SIZE(max77843_muic_irq),
+};
+
+static int max77843_muic_set_path(struct max77843_muic_info *info,
+		u8 val, bool attached)
+{
+	struct max77843 *max77843 = info->max77843;
+	int ret = 0;
+	unsigned int ctrl1, ctrl2;
+
+	if (attached)
+		ctrl1 = val;
+	else
+		ctrl1 = CONTROL1_SW_OPEN;
+
+	ret = regmap_update_bits(max77843->regmap_muic,
+			MAX77843_MUIC_REG_CONTROL1,
+			CONTROL1_COM_SW, ctrl1);
+	if (ret < 0) {
+		dev_err(info->dev, "Cannot switch MUIC port\n");
+		return ret;
+	}
+
+	if (attached)
+		ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
+	else
+		ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
+
+	ret = regmap_update_bits(max77843->regmap_muic,
+			MAX77843_MUIC_REG_CONTROL2,
+			MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
+			MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
+	if (ret < 0) {
+		dev_err(info->dev, "Cannot update lowpower mode\n");
+		return ret;
+	}
+
+	dev_dbg(info->dev,
+		"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
+		ctrl1, ctrl2, attached ? "attached" : "detached");
+
+	return 0;
+}
+
+static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
+		enum max77843_muic_cable_group group, bool *attached)
+{
+	int adc, chg_type, cable_type, gnd_type;
+
+	adc = info->status[MAX77843_MUIC_STATUS1] &
+			MAX77843_MUIC_STATUS1_ADC_MASK;
+	adc >>= STATUS1_ADC_SHIFT;
+
+	switch (group) {
+	case MAX77843_CABLE_GROUP_ADC:
+		if (adc == MAX77843_MUIC_ADC_OPEN) {
+			*attached = false;
+			cable_type = info->prev_cable_type;
+			info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
+		} else {
+			*attached = true;
+			cable_type = info->prev_cable_type = adc;
+		}
+		break;
+	case MAX77843_CABLE_GROUP_CHG:
+		chg_type = info->status[MAX77843_MUIC_STATUS2] &
+				MAX77843_MUIC_STATUS2_CHGTYP_MASK;
+
+		/* Check GROUND accessory with charger cable */
+		if (adc == MAX77843_MUIC_ADC_GROUND) {
+			if (chg_type == MAX77843_MUIC_CHG_NONE) {
+				/* The following state when charger cable is
+				 * disconnected but the GROUND accessory still
+				 * connected */
+				*attached = false;
+				cable_type = info->prev_chg_type;
+				info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
+			} else {
+
+				/* The following state when charger cable is
+				 * connected on the GROUND accessory */
+				*attached = true;
+				cable_type = MAX77843_MUIC_CHG_GND;
+				info->prev_chg_type = MAX77843_MUIC_CHG_GND;
+			}
+			break;
+		}
+
+		if (chg_type == MAX77843_MUIC_CHG_NONE) {
+			*attached = false;
+			cable_type = info->prev_chg_type;
+			info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
+		} else {
+			*attached = true;
+			cable_type = info->prev_chg_type = chg_type;
+		}
+		break;
+	case MAX77843_CABLE_GROUP_ADC_GND:
+		if (adc == MAX77843_MUIC_ADC_OPEN) {
+			*attached = false;
+			cable_type = info->prev_gnd_type;
+			info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
+		} else {
+			*attached = true;
+
+			/* Offset|ADC1K|VBVolt|
+			 *    0x1|    0|     0| USB-HOST
+			 *    0x1|    0|     1| USB-HOST with VB
+			 *    0x1|    1|     0| MHL
+			 *    0x1|    1|     1| MHL with VB */
+			/* Get ADC1K register bit */
+			gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
+					MAX77843_MUIC_STATUS1_ADC1K_MASK);
+
+			/* Get VBVolt register bit */
+			gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
+					MAX77843_MUIC_STATUS2_VBVOLT_MASK);
+			gnd_type >>= STATUS2_VBVOLT_SHIFT;
+
+			/* Offset of GND cable */
+			gnd_type |= MAX77843_MUIC_GND_USB_HOST;
+			cable_type = info->prev_gnd_type = gnd_type;
+		}
+		break;
+	default:
+		dev_err(info->dev, "Unknown cable group (%d)\n", group);
+		cable_type = -EINVAL;
+		break;
+	}
+
+	return cable_type;
+}
+
+static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
+{
+	int ret, gnd_cable_type;
+	bool attached;
+
+	gnd_cable_type = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_ADC_GND, &attached);
+	dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
+			attached ? "attached" : "detached", gnd_cable_type);
+
+	switch (gnd_cable_type) {
+	case MAX77843_MUIC_GND_USB_HOST:
+	case MAX77843_MUIC_GND_USB_HOST_VB:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "USB-HOST", attached);
+		break;
+	case MAX77843_MUIC_GND_MHL_VB:
+	case MAX77843_MUIC_GND_MHL:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "MHL", attached);
+		break;
+	default:
+		dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
+			attached ? "attached" : "detached", gnd_cable_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77843_muic_jig_handler(struct max77843_muic_info *info,
+		int cable_type, bool attached)
+{
+	int ret;
+
+	dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
+			attached ? "attached" : "detached", cable_type);
+
+	switch (cable_type) {
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+		extcon_set_cable_state(info->edev, "JIG-USB-OFF", attached);
+		break;
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+		extcon_set_cable_state(info->edev, "JIG-USB-ON", attached);
+		break;
+	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_UART, attached);
+		if (ret < 0)
+			return ret;
+		extcon_set_cable_state(info->edev, "JIG-UART-OFF", attached);
+		break;
+	default:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	}
+
+	return 0;
+}
+
+static int max77843_muic_adc_handler(struct max77843_muic_info *info)
+{
+	int ret, cable_type;
+	bool attached;
+
+	cable_type = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_ADC, &attached);
+
+	dev_dbg(info->dev,
+		"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
+		attached ? "attached" : "detached", cable_type,
+		info->prev_cable_type);
+
+	switch (cable_type) {
+	case MAX77843_MUIC_ADC_GROUND:
+		ret = max77843_muic_adc_gnd_handler(info);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
+	case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
+	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
+		ret = max77843_muic_jig_handler(info, cable_type, attached);
+		if (ret < 0)
+			return ret;
+		break;
+	case MAX77843_MUIC_ADC_SEND_END_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
+	case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_1:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_2:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_3:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_4:
+	case MAX77843_MUIC_ADC_RESERVED_ACC_5:
+	case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
+	case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
+	case MAX77843_MUIC_ADC_TTY_CONVERTER:
+	case MAX77843_MUIC_ADC_UART_CABLE:
+	case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
+	case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
+	case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
+	case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
+	case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
+	case MAX77843_MUIC_ADC_OPEN:
+		dev_err(info->dev,
+			"accessory is %s but it isn't used (adc:0x%x)\n",
+			attached ? "attached" : "detached", cable_type);
+		return -EAGAIN;
+	default:
+		dev_err(info->dev,
+			"failed to detect %s accessory (adc:0x%x)\n",
+			attached ? "attached" : "detached", cable_type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77843_muic_chg_handler(struct max77843_muic_info *info)
+{
+	int ret, chg_type, gnd_type;
+	bool attached;
+
+	chg_type = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_CHG, &attached);
+
+	dev_dbg(info->dev,
+		"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
+		attached ? "attached" : "detached",
+		chg_type, info->prev_chg_type);
+
+	switch (chg_type) {
+	case MAX77843_MUIC_CHG_USB:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "USB", attached);
+		break;
+	case MAX77843_MUIC_CHG_DOWNSTREAM:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev,
+				"CHARGER-DOWNSTREAM", attached);
+		break;
+	case MAX77843_MUIC_CHG_DEDICATED:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "TA", attached);
+		break;
+	case MAX77843_MUIC_CHG_SPECIAL_500MA:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "SLOW-CHAREGER", attached);
+		break;
+	case MAX77843_MUIC_CHG_SPECIAL_1A:
+		ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		if (ret < 0)
+			return ret;
+
+		extcon_set_cable_state(info->edev, "FAST-CHARGER", attached);
+		break;
+	case MAX77843_MUIC_CHG_GND:
+		gnd_type = max77843_muic_get_cable_type(info,
+				MAX77843_CABLE_GROUP_ADC_GND, &attached);
+
+		/* Charger cable on MHL accessory is attach or detach */
+		if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
+			extcon_set_cable_state(info->edev, "MHL-TA", true);
+		else if (gnd_type == MAX77843_MUIC_GND_MHL)
+			extcon_set_cable_state(info->edev, "MHL-TA", false);
+		break;
+	case MAX77843_MUIC_CHG_NONE:
+		break;
+	default:
+		dev_err(info->dev,
+			"failed to detect %s accessory (chg_type:0x%x)\n",
+			attached ? "attached" : "detached", chg_type);
+
+		max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void max77843_muic_irq_work(struct work_struct *work)
+{
+	struct max77843_muic_info *info = container_of(work,
+			struct max77843_muic_info, irq_work);
+	struct max77843 *max77843 = info->max77843;
+	int ret = 0;
+
+	mutex_lock(&info->mutex);
+
+	ret = regmap_bulk_read(max77843->regmap_muic,
+			MAX77843_MUIC_REG_STATUS1, info->status,
+			MAX77843_MUIC_STATUS_NUM);
+	if (ret) {
+		dev_err(info->dev, "Cannot read STATUS registers\n");
+		mutex_unlock(&info->mutex);
+		return;
+	}
+
+	if (info->irq_adc) {
+		ret = max77843_muic_adc_handler(info);
+		if (ret)
+			dev_err(info->dev, "Unknown cable type\n");
+		info->irq_adc = false;
+	}
+
+	if (info->irq_chg) {
+		ret = max77843_muic_chg_handler(info);
+		if (ret)
+			dev_err(info->dev, "Unknown charger type\n");
+		info->irq_chg = false;
+	}
+
+	mutex_unlock(&info->mutex);
+}
+
+static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
+{
+	struct max77843_muic_info *info = data;
+	int i, irq_type = -1;
+
+	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
+		if (irq == max77843_muic_irqs[i].virq)
+			irq_type = max77843_muic_irqs[i].irq;
+
+	switch (irq_type) {
+	case MAX77843_MUIC_IRQ_INT1_ADC:
+	case MAX77843_MUIC_IRQ_INT1_ADCERROR:
+	case MAX77843_MUIC_IRQ_INT1_ADC1K:
+		info->irq_adc = true;
+		break;
+	case MAX77843_MUIC_IRQ_INT2_CHGTYP:
+	case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
+	case MAX77843_MUIC_IRQ_INT2_DCDTMR:
+	case MAX77843_MUIC_IRQ_INT2_DXOVP:
+	case MAX77843_MUIC_IRQ_INT2_VBVOLT:
+		info->irq_chg = true;
+		break;
+	case MAX77843_MUIC_IRQ_INT3_VBADC:
+	case MAX77843_MUIC_IRQ_INT3_VDNMON:
+	case MAX77843_MUIC_IRQ_INT3_DNRES:
+	case MAX77843_MUIC_IRQ_INT3_MPNACK:
+	case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
+	case MAX77843_MUIC_IRQ_INT3_MRXTRF:
+	case MAX77843_MUIC_IRQ_INT3_MRXPERR:
+	case MAX77843_MUIC_IRQ_INT3_MRXRDY:
+		break;
+	default:
+		dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
+		break;
+	}
+
+	schedule_work(&info->irq_work);
+
+	return IRQ_HANDLED;
+}
+
+static void max77843_muic_detect_cable_wq(struct work_struct *work)
+{
+	struct max77843_muic_info *info = container_of(to_delayed_work(work),
+			struct max77843_muic_info, wq_detcable);
+	struct max77843 *max77843 = info->max77843;
+	int chg_type, adc, ret;
+	bool attached;
+
+	mutex_lock(&info->mutex);
+
+	ret = regmap_bulk_read(max77843->regmap_muic,
+			MAX77843_MUIC_REG_STATUS1, info->status,
+			MAX77843_MUIC_STATUS_NUM);
+	if (ret) {
+		dev_err(info->dev, "Cannot read STATUS registers\n");
+		goto err_cable_wq;
+	}
+
+	adc = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_ADC, &attached);
+	if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
+		ret = max77843_muic_adc_handler(info);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot detect accessory\n");
+			goto err_cable_wq;
+		}
+	}
+
+	chg_type = max77843_muic_get_cable_type(info,
+			MAX77843_CABLE_GROUP_CHG, &attached);
+	if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
+		ret = max77843_muic_chg_handler(info);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot detect charger accessory\n");
+			goto err_cable_wq;
+		}
+	}
+
+err_cable_wq:
+	mutex_unlock(&info->mutex);
+}
+
+static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
+		enum max77843_muic_adc_debounce_time time)
+{
+	struct max77843 *max77843 = info->max77843;
+	int ret;
+
+	switch (time) {
+	case MAX77843_DEBOUNCE_TIME_5MS:
+	case MAX77843_DEBOUNCE_TIME_10MS:
+	case MAX77843_DEBOUNCE_TIME_25MS:
+	case MAX77843_DEBOUNCE_TIME_38_62MS:
+		ret = regmap_update_bits(max77843->regmap_muic,
+				MAX77843_MUIC_REG_CONTROL4,
+				MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
+				time << CONTROL4_ADCDBSET_SHIFT);
+		if (ret < 0) {
+			dev_err(info->dev, "Cannot write MUIC regmap\n");
+			return ret;
+		}
+		break;
+	default:
+		dev_err(info->dev, "Invalid ADC debounce time\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77843_init_muic_regmap(struct max77843 *max77843)
+{
+	int ret;
+
+	max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
+			I2C_ADDR_MUIC);
+	if (!max77843->i2c_muic) {
+		dev_err(&max77843->i2c->dev,
+				"Cannot allocate I2C device for MUIC\n");
+		return -ENOMEM;
+	}
+
+	i2c_set_clientdata(max77843->i2c_muic, max77843);
+
+	max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
+			&max77843_muic_regmap_config);
+	if (IS_ERR(max77843->regmap_muic)) {
+		ret = PTR_ERR(max77843->regmap_muic);
+		goto err_muic_i2c;
+	}
+
+	ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
+			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
+			0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
+	if (ret < 0) {
+		dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
+		goto err_muic_i2c;
+	}
+
+	return 0;
+
+err_muic_i2c:
+	i2c_unregister_device(max77843->i2c_muic);
+
+	return ret;
+}
+
+static int max77843_muic_probe(struct platform_device *pdev)
+{
+	struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
+	struct max77843_muic_info *info;
+	unsigned int id;
+	int i, ret;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+	info->max77843 = max77843;
+
+	platform_set_drvdata(pdev, info);
+	mutex_init(&info->mutex);
+
+	/* Initialize i2c and regmap */
+	ret = max77843_init_muic_regmap(max77843);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
+		return ret;
+	}
+
+	/* Turn off auto detection configuration */
+	ret = regmap_update_bits(max77843->regmap_muic,
+			MAX77843_MUIC_REG_CONTROL4,
+			MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
+			MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
+			CONTROL4_AUTO_DISABLE);
+
+	/* Initialize extcon device */
+	info->edev = devm_extcon_dev_allocate(&pdev->dev,
+			max77843_extcon_cable);
+	if (IS_ERR(info->edev)) {
+		dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
+		ret = -ENODEV;
+		goto err_muic_irq;
+	}
+
+	ret = devm_extcon_dev_register(&pdev->dev, info->edev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register extcon device\n");
+		goto err_muic_irq;
+	}
+
+	/* Set ADC debounce time */
+	max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
+
+	/* Set initial path for UART */
+	max77843_muic_set_path(info, CONTROL1_SW_UART, true);
+
+	/* Check revision number of MUIC device */
+	ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to read revision number\n");
+		goto err_muic_irq;
+	}
+	dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
+
+	/* Support virtual irq domain for max77843 MUIC device */
+	INIT_WORK(&info->irq_work, max77843_muic_irq_work);
+
+	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
+		struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
+		unsigned int virq = 0;
+
+		virq = regmap_irq_get_virq(max77843->irq_data_muic,
+				muic_irq->irq);
+		if (virq <= 0) {
+			ret = -EINVAL;
+			goto err_muic_irq;
+		}
+		muic_irq->virq = virq;
+
+		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
+				max77843_muic_irq_handler, IRQF_NO_SUSPEND,
+				muic_irq->name, info);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Failed to request irq (IRQ: %d, error: %d)\n",
+				muic_irq->irq, ret);
+			goto err_muic_irq;
+		}
+	}
+
+	/* Detect accessory after completing the initialization of platform */
+	INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
+	queue_delayed_work(system_power_efficient_wq,
+			&info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
+
+	return 0;
+
+err_muic_irq:
+	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
+	i2c_unregister_device(max77843->i2c_muic);
+
+	return ret;
+}
+
+static int max77843_muic_remove(struct platform_device *pdev)
+{
+	struct max77843_muic_info *info = platform_get_drvdata(pdev);
+	struct max77843 *max77843 = info->max77843;
+
+	cancel_work_sync(&info->irq_work);
+	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
+	i2c_unregister_device(max77843->i2c_muic);
+
+	return 0;
+}
+
+static const struct platform_device_id max77843_muic_id[] = {
+	{ "max77843-muic", },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(platform, max77843_muic_id);
+
+static struct platform_driver max77843_muic_driver = {
+	.driver		= {
+		.name		= "max77843-muic",
+	},
+	.probe		= max77843_muic_probe,
+	.remove		= max77843_muic_remove,
+	.id_table	= max77843_muic_id,
+};
+
+static int __init max77843_muic_init(void)
+{
+	return platform_driver_register(&max77843_muic_driver);
+}
+subsys_initcall(max77843_muic_init);
+
+MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
+MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c
index fc1678fa95c4..5774e56c6422 100644
--- a/drivers/extcon/extcon-max8997.c
+++ b/drivers/extcon/extcon-max8997.c
@@ -579,8 +579,6 @@ static void max8997_muic_irq_work(struct work_struct *work)
 		dev_err(info->dev, "failed to handle MUIC interrupt\n");
 
 	mutex_unlock(&info->mutex);
-
-	return;
 }
 
 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
@@ -689,8 +687,7 @@ static int max8997_muic_probe(struct platform_device *pdev)
 				muic_irq->name, info);
 		if (ret) {
 			dev_err(&pdev->dev,
-				"failed: irq request (IRQ: %d,"
-				" error :%d)\n",
+				"failed: irq request (IRQ: %d, error :%d)\n",
 				muic_irq->irq, ret);
 			goto err_irq;
 		}
diff --git a/drivers/extcon/extcon-rt8973a.c b/drivers/extcon/extcon-rt8973a.c
index a784b2d5ee72..9ccd5af89d1c 100644
--- a/drivers/extcon/extcon-rt8973a.c
+++ b/drivers/extcon/extcon-rt8973a.c
@@ -582,10 +582,8 @@ static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
 		return -EINVAL;
 
 	info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
-	if (!info) {
-		dev_err(&i2c->dev, "failed to allocate memory\n");
+	if (!info)
 		return -ENOMEM;
-	}
 	i2c_set_clientdata(i2c, info);
 
 	info->dev = &i2c->dev;
@@ -681,7 +679,7 @@ static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
 	return 0;
 }
 
-static struct of_device_id rt8973a_dt_match[] = {
+static const struct of_device_id rt8973a_dt_match[] = {
 	{ .compatible = "richtek,rt8973a-muic" },
 	{ },
 };
diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
index b0f7bd82af90..2f93cf307852 100644
--- a/drivers/extcon/extcon-sm5502.c
+++ b/drivers/extcon/extcon-sm5502.c
@@ -359,8 +359,8 @@ static unsigned int sm5502_muic_get_cable_type(struct sm5502_muic_info *info)
 			break;
 		default:
 			dev_dbg(info->dev,
-				"cannot identify the cable type: adc(0x%x) "
-				"dev_type1(0x%x)\n", adc, dev_type1);
+				"cannot identify the cable type: adc(0x%x)\n",
+				adc);
 			return -EINVAL;
 		};
 		break;
@@ -659,7 +659,7 @@ static int sm5502_muic_i2c_remove(struct i2c_client *i2c)
 	return 0;
 }
 
-static struct of_device_id sm5502_dt_match[] = {
+static const struct of_device_id sm5502_dt_match[] = {
 	{ .compatible = "siliconmitus,sm5502-muic" },
 	{ },
 };
diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
new file mode 100644
index 000000000000..de67fce18984
--- /dev/null
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -0,0 +1,237 @@
+/**
+ * drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver
+ *
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Roger Quadros <rogerq@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/extcon.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#define USB_GPIO_DEBOUNCE_MS	20	/* ms */
+
+struct usb_extcon_info {
+	struct device *dev;
+	struct extcon_dev *edev;
+
+	struct gpio_desc *id_gpiod;
+	int id_irq;
+
+	unsigned long debounce_jiffies;
+	struct delayed_work wq_detcable;
+};
+
+/* List of detectable cables */
+enum {
+	EXTCON_CABLE_USB = 0,
+	EXTCON_CABLE_USB_HOST,
+
+	EXTCON_CABLE_END,
+};
+
+static const char *usb_extcon_cable[] = {
+	[EXTCON_CABLE_USB] = "USB",
+	[EXTCON_CABLE_USB_HOST] = "USB-HOST",
+	NULL,
+};
+
+static void usb_extcon_detect_cable(struct work_struct *work)
+{
+	int id;
+	struct usb_extcon_info *info = container_of(to_delayed_work(work),
+						    struct usb_extcon_info,
+						    wq_detcable);
+
+	/* check ID and update cable state */
+	id = gpiod_get_value_cansleep(info->id_gpiod);
+	if (id) {
+		/*
+		 * ID = 1 means USB HOST cable detached.
+		 * As we don't have event for USB peripheral cable attached,
+		 * we simulate USB peripheral attach here.
+		 */
+		extcon_set_cable_state(info->edev,
+				       usb_extcon_cable[EXTCON_CABLE_USB_HOST],
+				       false);
+		extcon_set_cable_state(info->edev,
+				       usb_extcon_cable[EXTCON_CABLE_USB],
+				       true);
+	} else {
+		/*
+		 * ID = 0 means USB HOST cable attached.
+		 * As we don't have event for USB peripheral cable detached,
+		 * we simulate USB peripheral detach here.
+		 */
+		extcon_set_cable_state(info->edev,
+				       usb_extcon_cable[EXTCON_CABLE_USB],
+				       false);
+		extcon_set_cable_state(info->edev,
+				       usb_extcon_cable[EXTCON_CABLE_USB_HOST],
+				       true);
+	}
+}
+
+static irqreturn_t usb_irq_handler(int irq, void *dev_id)
+{
+	struct usb_extcon_info *info = dev_id;
+
+	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+			   info->debounce_jiffies);
+
+	return IRQ_HANDLED;
+}
+
+static int usb_extcon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct usb_extcon_info *info;
+	int ret;
+
+	if (!np)
+		return -EINVAL;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = dev;
+	info->id_gpiod = devm_gpiod_get(&pdev->dev, "id");
+	if (IS_ERR(info->id_gpiod)) {
+		dev_err(dev, "failed to get ID GPIO\n");
+		return PTR_ERR(info->id_gpiod);
+	}
+
+	ret = gpiod_set_debounce(info->id_gpiod,
+				 USB_GPIO_DEBOUNCE_MS * 1000);
+	if (ret < 0)
+		info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);
+
+	INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);
+
+	info->id_irq = gpiod_to_irq(info->id_gpiod);
+	if (info->id_irq < 0) {
+		dev_err(dev, "failed to get ID IRQ\n");
+		return info->id_irq;
+	}
+
+	ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
+					usb_irq_handler,
+					IRQF_TRIGGER_RISING |
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					pdev->name, info);
+	if (ret < 0) {
+		dev_err(dev, "failed to request handler for ID IRQ\n");
+		return ret;
+	}
+
+	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
+	if (IS_ERR(info->edev)) {
+		dev_err(dev, "failed to allocate extcon device\n");
+		return -ENOMEM;
+	}
+
+	ret = devm_extcon_dev_register(dev, info->edev);
+	if (ret < 0) {
+		dev_err(dev, "failed to register extcon device\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, info);
+	device_init_wakeup(dev, 1);
+
+	/* Perform initial detection */
+	usb_extcon_detect_cable(&info->wq_detcable.work);
+
+	return 0;
+}
+
+static int usb_extcon_remove(struct platform_device *pdev)
+{
+	struct usb_extcon_info *info = platform_get_drvdata(pdev);
+
+	cancel_delayed_work_sync(&info->wq_detcable);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int usb_extcon_suspend(struct device *dev)
+{
+	struct usb_extcon_info *info = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (device_may_wakeup(dev)) {
+		ret = enable_irq_wake(info->id_irq);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * We don't want to process any IRQs after this point
+	 * as GPIOs used behind I2C subsystem might not be
+	 * accessible until resume completes. So disable IRQ.
+	 */
+	disable_irq(info->id_irq);
+
+	return ret;
+}
+
+static int usb_extcon_resume(struct device *dev)
+{
+	struct usb_extcon_info *info = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (device_may_wakeup(dev)) {
+		ret = disable_irq_wake(info->id_irq);
+		if (ret)
+			return ret;
+	}
+
+	enable_irq(info->id_irq);
+
+	return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops,
+			 usb_extcon_suspend, usb_extcon_resume);
+
+static const struct of_device_id usb_extcon_dt_match[] = {
+	{ .compatible = "linux,extcon-usb-gpio", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, usb_extcon_dt_match);
+
+static struct platform_driver usb_extcon_driver = {
+	.probe		= usb_extcon_probe,
+	.remove		= usb_extcon_remove,
+	.driver		= {
+		.name	= "extcon-usb-gpio",
+		.pm	= &usb_extcon_pm_ops,
+		.of_match_table = usb_extcon_dt_match,
+	},
+};
+
+module_platform_driver(usb_extcon_driver);
+
+MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
+MODULE_DESCRIPTION("USB GPIO extcon driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon.c
index 8319f25b7145..4c9f165e4a04 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon.c
@@ -158,6 +158,7 @@ static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 	/* Optional callback given by the user */
 	if (edev->print_name) {
 		int ret = edev->print_name(edev, buf);
+
 		if (ret >= 0)
 			return ret;
 	}
@@ -444,6 +445,9 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
 			     const char *extcon_name, const char *cable_name,
 			     struct notifier_block *nb)
 {
+	unsigned long flags;
+	int ret;
+
 	if (!obj || !cable_name || !nb)
 		return -EINVAL;
 
@@ -461,8 +465,11 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
 
 		obj->internal_nb.notifier_call = _call_per_cable;
 
-		return raw_notifier_chain_register(&obj->edev->nh,
+		spin_lock_irqsave(&obj->edev->lock, flags);
+		ret = raw_notifier_chain_register(&obj->edev->nh,
 						  &obj->internal_nb);
+		spin_unlock_irqrestore(&obj->edev->lock, flags);
+		return ret;
 	} else {
 		struct class_dev_iter iter;
 		struct extcon_dev *extd;
@@ -495,10 +502,17 @@ EXPORT_SYMBOL_GPL(extcon_register_interest);
  */
 int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
 {
+	unsigned long flags;
+	int ret;
+
 	if (!obj)
 		return -EINVAL;
 
-	return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
+	spin_lock_irqsave(&obj->edev->lock, flags);
+	ret = raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
+	spin_unlock_irqrestore(&obj->edev->lock, flags);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(extcon_unregister_interest);
 
@@ -515,7 +529,14 @@ EXPORT_SYMBOL_GPL(extcon_unregister_interest);
 int extcon_register_notifier(struct extcon_dev *edev,
 			struct notifier_block *nb)
 {
-	return raw_notifier_chain_register(&edev->nh, nb);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&edev->lock, flags);
+	ret = raw_notifier_chain_register(&edev->nh, nb);
+	spin_unlock_irqrestore(&edev->lock, flags);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(extcon_register_notifier);
 
@@ -527,7 +548,14 @@ EXPORT_SYMBOL_GPL(extcon_register_notifier);
 int extcon_unregister_notifier(struct extcon_dev *edev,
 			struct notifier_block *nb)
 {
-	return raw_notifier_chain_unregister(&edev->nh, nb);
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&edev->lock, flags);
+	ret = raw_notifier_chain_unregister(&edev->nh, nb);
+	spin_unlock_irqrestore(&edev->lock, flags);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
 
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 2978f5ee8d2a..54da66dc7d16 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -71,7 +71,8 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 	struct vmbus_channel_msginfo *open_info = NULL;
 	void *in, *out;
 	unsigned long flags;
-	int ret, t, err = 0;
+	int ret, err = 0;
+	unsigned long t;
 
 	spin_lock_irqsave(&newchannel->lock, flags);
 	if (newchannel->state == CHANNEL_OPEN_STATE) {
@@ -89,9 +90,10 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 	out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
 		get_order(send_ringbuffer_size + recv_ringbuffer_size));
 
-	if (!out)
-		return -ENOMEM;
-
+	if (!out) {
+		err = -ENOMEM;
+		goto error0;
+	}
 
 	in = (void *)((unsigned long)out + send_ringbuffer_size);
 
@@ -135,7 +137,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 			   GFP_KERNEL);
 	if (!open_info) {
 		err = -ENOMEM;
-		goto error0;
+		goto error_gpadl;
 	}
 
 	init_completion(&open_info->waitevent);
@@ -151,7 +153,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
 
 	if (userdatalen > MAX_USER_DEFINED_BYTES) {
 		err = -EINVAL;
-		goto error0;
+		goto error_gpadl;
 	}
 
 	if (userdatalen)
@@ -195,10 +197,14 @@ error1:
 	list_del(&open_info->msglistentry);
 	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
 
+error_gpadl:
+	vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);
+
 error0:
 	free_pages((unsigned long)out,
 		get_order(send_ringbuffer_size + recv_ringbuffer_size));
 	kfree(open_info);
+	newchannel->state = CHANNEL_OPEN_STATE;
 	return err;
 }
 EXPORT_SYMBOL_GPL(vmbus_open);
@@ -534,6 +540,12 @@ static int vmbus_close_internal(struct vmbus_channel *channel)
 	free_pages((unsigned long)channel->ringbuffer_pages,
 		get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
 
+	/*
+	 * If the channel has been rescinded; process device removal.
+	 */
+	if (channel->rescind)
+		hv_process_channel_removal(channel,
+					   channel->offermsg.child_relid);
 	return ret;
 }
 
@@ -569,23 +581,9 @@ void vmbus_close(struct vmbus_channel *channel)
 }
 EXPORT_SYMBOL_GPL(vmbus_close);
 
-/**
- * vmbus_sendpacket() - Send the specified buffer on the given channel
- * @channel: Pointer to vmbus_channel structure.
- * @buffer: Pointer to the buffer you want to receive the data into.
- * @bufferlen: Maximum size of what the the buffer will hold
- * @requestid: Identifier of the request
- * @type: Type of packet that is being send e.g. negotiate, time
- * packet etc.
- *
- * Sends data in @buffer directly to hyper-v via the vmbus
- * This will send the data unparsed to hyper-v.
- *
- * Mainly used by Hyper-V drivers.
- */
-int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
+int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
 			   u32 bufferlen, u64 requestid,
-			   enum vmbus_packet_type type, u32 flags)
+			   enum vmbus_packet_type type, u32 flags, bool kick_q)
 {
 	struct vmpacket_descriptor desc;
 	u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
@@ -613,21 +611,61 @@ int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
 
 	ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
 
-	if (ret == 0 && signal)
+	/*
+	 * Signalling the host is conditional on many factors:
+	 * 1. The ring state changed from being empty to non-empty.
+	 *    This is tracked by the variable "signal".
+	 * 2. The variable kick_q tracks if more data will be placed
+	 *    on the ring. We will not signal if more data is
+	 *    to be placed.
+	 *
+	 * If we cannot write to the ring-buffer; signal the host
+	 * even if we may not have written anything. This is a rare
+	 * enough condition that it should not matter.
+	 */
+	if (((ret == 0) && kick_q && signal) || (ret))
 		vmbus_setevent(channel);
 
 	return ret;
 }
+EXPORT_SYMBOL(vmbus_sendpacket_ctl);
+
+/**
+ * vmbus_sendpacket() - Send the specified buffer on the given channel
+ * @channel: Pointer to vmbus_channel structure.
+ * @buffer: Pointer to the buffer you want to receive the data into.
+ * @bufferlen: Maximum size of what the the buffer will hold
+ * @requestid: Identifier of the request
+ * @type: Type of packet that is being send e.g. negotiate, time
+ * packet etc.
+ *
+ * Sends data in @buffer directly to hyper-v via the vmbus
+ * This will send the data unparsed to hyper-v.
+ *
+ * Mainly used by Hyper-V drivers.
+ */
+int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
+			   u32 bufferlen, u64 requestid,
+			   enum vmbus_packet_type type, u32 flags)
+{
+	return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid,
+				    type, flags, true);
+}
 EXPORT_SYMBOL(vmbus_sendpacket);
 
 /*
- * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
- * packets using a GPADL Direct packet type.
+ * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer
+ * packets using a GPADL Direct packet type. This interface allows you
+ * to control notifying the host. This will be useful for sending
+ * batched data. Also the sender can control the send flags
+ * explicitly.
  */
-int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
+int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
 				     struct hv_page_buffer pagebuffers[],
 				     u32 pagecount, void *buffer, u32 bufferlen,
-				     u64 requestid)
+				     u64 requestid,
+				     u32 flags,
+				     bool kick_q)
 {
 	int ret;
 	int i;
@@ -655,7 +693,7 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
 
 	/* Setup the descriptor */
 	desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
-	desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
+	desc.flags = flags;
 	desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
 	desc.length8 = (u16)(packetlen_aligned >> 3);
 	desc.transactionid = requestid;
@@ -676,11 +714,40 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
 
 	ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
 
-	if (ret == 0 && signal)
+	/*
+	 * Signalling the host is conditional on many factors:
+	 * 1. The ring state changed from being empty to non-empty.
+	 *    This is tracked by the variable "signal".
+	 * 2. The variable kick_q tracks if more data will be placed
+	 *    on the ring. We will not signal if more data is
+	 *    to be placed.
+	 *
+	 * If we cannot write to the ring-buffer; signal the host
+	 * even if we may not have written anything. This is a rare
+	 * enough condition that it should not matter.
+	 */
+	if (((ret == 0) && kick_q && signal) || (ret))
 		vmbus_setevent(channel);
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl);
+
+/*
+ * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
+ * packets using a GPADL Direct packet type.
+ */
+int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
+				     struct hv_page_buffer pagebuffers[],
+				     u32 pagecount, void *buffer, u32 bufferlen,
+				     u64 requestid)
+{
+	u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
+	return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount,
+					       buffer, bufferlen, requestid,
+					       flags, true);
+
+}
 EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
 
 /*
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 3736f71bdec5..0eeb1b3bc048 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -32,12 +32,6 @@
 
 #include "hyperv_vmbus.h"
 
-struct vmbus_channel_message_table_entry {
-	enum vmbus_channel_message_type message_type;
-	void (*message_handler)(struct vmbus_channel_message_header *msg);
-};
-
-
 /**
  * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
  * @icmsghdrp: Pointer to msg header structure
@@ -139,54 +133,29 @@ EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
  */
 static struct vmbus_channel *alloc_channel(void)
 {
+	static atomic_t chan_num = ATOMIC_INIT(0);
 	struct vmbus_channel *channel;
 
 	channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
 	if (!channel)
 		return NULL;
 
+	channel->id = atomic_inc_return(&chan_num);
 	spin_lock_init(&channel->inbound_lock);
 	spin_lock_init(&channel->lock);
 
 	INIT_LIST_HEAD(&channel->sc_list);
 	INIT_LIST_HEAD(&channel->percpu_list);
 
-	channel->controlwq = create_workqueue("hv_vmbus_ctl");
-	if (!channel->controlwq) {
-		kfree(channel);
-		return NULL;
-	}
-
 	return channel;
 }
 
 /*
- * release_hannel - Release the vmbus channel object itself
- */
-static void release_channel(struct work_struct *work)
-{
-	struct vmbus_channel *channel = container_of(work,
-						     struct vmbus_channel,
-						     work);
-
-	destroy_workqueue(channel->controlwq);
-
-	kfree(channel);
-}
-
-/*
  * free_channel - Release the resources used by the vmbus channel object
  */
 static void free_channel(struct vmbus_channel *channel)
 {
-
-	/*
-	 * We have to release the channel's workqueue/thread in the vmbus's
-	 * workqueue/thread context
-	 * ie we can't destroy ourselves.
-	 */
-	INIT_WORK(&channel->work, release_channel);
-	queue_work(vmbus_connection.work_queue, &channel->work);
+	kfree(channel);
 }
 
 static void percpu_channel_enq(void *arg)
@@ -204,33 +173,21 @@ static void percpu_channel_deq(void *arg)
 	list_del(&channel->percpu_list);
 }
 
-/*
- * vmbus_process_rescind_offer -
- * Rescind the offer by initiating a device removal
- */
-static void vmbus_process_rescind_offer(struct work_struct *work)
+
+void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
 {
-	struct vmbus_channel *channel = container_of(work,
-						     struct vmbus_channel,
-						     work);
+	struct vmbus_channel_relid_released msg;
 	unsigned long flags;
 	struct vmbus_channel *primary_channel;
-	struct vmbus_channel_relid_released msg;
-	struct device *dev;
-
-	if (channel->device_obj) {
-		dev = get_device(&channel->device_obj->device);
-		if (dev) {
-			vmbus_device_unregister(channel->device_obj);
-			put_device(dev);
-		}
-	}
 
 	memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
-	msg.child_relid = channel->offermsg.child_relid;
+	msg.child_relid = relid;
 	msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
 	vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released));
 
+	if (channel == NULL)
+		return;
+
 	if (channel->target_cpu != get_cpu()) {
 		put_cpu();
 		smp_call_function_single(channel->target_cpu,
@@ -259,7 +216,6 @@ void vmbus_free_channels(void)
 
 	list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
 		vmbus_device_unregister(channel->device_obj);
-		kfree(channel->device_obj);
 		free_channel(channel);
 	}
 }
@@ -268,15 +224,11 @@ void vmbus_free_channels(void)
  * vmbus_process_offer - Process the offer by creating a channel/device
  * associated with this offer
  */
-static void vmbus_process_offer(struct work_struct *work)
+static void vmbus_process_offer(struct vmbus_channel *newchannel)
 {
-	struct vmbus_channel *newchannel = container_of(work,
-							struct vmbus_channel,
-							work);
 	struct vmbus_channel *channel;
 	bool fnew = true;
 	bool enq = false;
-	int ret;
 	unsigned long flags;
 
 	/* Make sure this is a new offer */
@@ -335,10 +287,11 @@ static void vmbus_process_offer(struct work_struct *work)
 			}
 
 			newchannel->state = CHANNEL_OPEN_STATE;
+			channel->num_sc++;
 			if (channel->sc_creation_callback != NULL)
 				channel->sc_creation_callback(newchannel);
 
-			goto done_init_rescind;
+			return;
 		}
 
 		goto err_free_chan;
@@ -361,33 +314,35 @@ static void vmbus_process_offer(struct work_struct *work)
 		&newchannel->offermsg.offer.if_instance,
 		newchannel);
 	if (!newchannel->device_obj)
-		goto err_free_chan;
+		goto err_deq_chan;
 
 	/*
 	 * Add the new device to the bus. This will kick off device-driver
 	 * binding which eventually invokes the device driver's AddDevice()
 	 * method.
 	 */
-	ret = vmbus_device_register(newchannel->device_obj);
-	if (ret != 0) {
+	if (vmbus_device_register(newchannel->device_obj) != 0) {
 		pr_err("unable to add child device object (relid %d)\n",
-			   newchannel->offermsg.child_relid);
-
-		spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
-		list_del(&newchannel->listentry);
-		spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+			newchannel->offermsg.child_relid);
 		kfree(newchannel->device_obj);
-		goto err_free_chan;
+		goto err_deq_chan;
 	}
-done_init_rescind:
-	spin_lock_irqsave(&newchannel->lock, flags);
-	/* The next possible work is rescind handling */
-	INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
-	/* Check if rescind offer was already received */
-	if (newchannel->rescind)
-		queue_work(newchannel->controlwq, &newchannel->work);
-	spin_unlock_irqrestore(&newchannel->lock, flags);
 	return;
+
+err_deq_chan:
+	spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+	list_del(&newchannel->listentry);
+	spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+
+	if (newchannel->target_cpu != get_cpu()) {
+		put_cpu();
+		smp_call_function_single(newchannel->target_cpu,
+					 percpu_channel_deq, newchannel, true);
+	} else {
+		percpu_channel_deq(newchannel);
+		put_cpu();
+	}
+
 err_free_chan:
 	free_channel(newchannel);
 }
@@ -411,6 +366,8 @@ static const struct hv_vmbus_device_id hp_devs[] = {
 	{ HV_SCSI_GUID, },
 	/* Network */
 	{ HV_NIC_GUID, },
+	/* NetworkDirect Guest RDMA */
+	{ HV_ND_GUID, },
 };
 
 
@@ -511,8 +468,7 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
 	newchannel->monitor_grp = (u8)offer->monitorid / 32;
 	newchannel->monitor_bit = (u8)offer->monitorid % 32;
 
-	INIT_WORK(&newchannel->work, vmbus_process_offer);
-	queue_work(newchannel->controlwq, &newchannel->work);
+	vmbus_process_offer(newchannel);
 }
 
 /*
@@ -525,28 +481,34 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
 	struct vmbus_channel_rescind_offer *rescind;
 	struct vmbus_channel *channel;
 	unsigned long flags;
+	struct device *dev;
 
 	rescind = (struct vmbus_channel_rescind_offer *)hdr;
 	channel = relid2channel(rescind->child_relid);
 
-	if (channel == NULL)
-		/* Just return here, no channel found */
+	if (channel == NULL) {
+		hv_process_channel_removal(NULL, rescind->child_relid);
 		return;
+	}
 
 	spin_lock_irqsave(&channel->lock, flags);
 	channel->rescind = true;
-	/*
-	 * channel->work.func != vmbus_process_rescind_offer means we are still
-	 * processing offer request and the rescind offer processing should be
-	 * postponed. It will be done at the very end of vmbus_process_offer()
-	 * as rescind flag is being checked there.
-	 */
-	if (channel->work.func == vmbus_process_rescind_offer)
-		/* work is initialized for vmbus_process_rescind_offer() from
-		 * vmbus_process_offer() where the channel got created */
-		queue_work(channel->controlwq, &channel->work);
-
 	spin_unlock_irqrestore(&channel->lock, flags);
+
+	if (channel->device_obj) {
+		/*
+		 * We will have to unregister this device from the
+		 * driver core.
+		 */
+		dev = get_device(&channel->device_obj->device);
+		if (dev) {
+			vmbus_device_unregister(channel->device_obj);
+			put_device(dev);
+		}
+	} else {
+		hv_process_channel_removal(channel,
+			channel->offermsg.child_relid);
+	}
 }
 
 /*
@@ -731,25 +693,25 @@ static void vmbus_onversion_response(
 }
 
 /* Channel message dispatch table */
-static struct vmbus_channel_message_table_entry
+struct vmbus_channel_message_table_entry
 	channel_message_table[CHANNELMSG_COUNT] = {
-	{CHANNELMSG_INVALID,			NULL},
-	{CHANNELMSG_OFFERCHANNEL,		vmbus_onoffer},
-	{CHANNELMSG_RESCIND_CHANNELOFFER,	vmbus_onoffer_rescind},
-	{CHANNELMSG_REQUESTOFFERS,		NULL},
-	{CHANNELMSG_ALLOFFERS_DELIVERED,	vmbus_onoffers_delivered},
-	{CHANNELMSG_OPENCHANNEL,		NULL},
-	{CHANNELMSG_OPENCHANNEL_RESULT,	vmbus_onopen_result},
-	{CHANNELMSG_CLOSECHANNEL,		NULL},
-	{CHANNELMSG_GPADL_HEADER,		NULL},
-	{CHANNELMSG_GPADL_BODY,		NULL},
-	{CHANNELMSG_GPADL_CREATED,		vmbus_ongpadl_created},
-	{CHANNELMSG_GPADL_TEARDOWN,		NULL},
-	{CHANNELMSG_GPADL_TORNDOWN,		vmbus_ongpadl_torndown},
-	{CHANNELMSG_RELID_RELEASED,		NULL},
-	{CHANNELMSG_INITIATE_CONTACT,		NULL},
-	{CHANNELMSG_VERSION_RESPONSE,		vmbus_onversion_response},
-	{CHANNELMSG_UNLOAD,			NULL},
+	{CHANNELMSG_INVALID,			0, NULL},
+	{CHANNELMSG_OFFERCHANNEL,		0, vmbus_onoffer},
+	{CHANNELMSG_RESCIND_CHANNELOFFER,	0, vmbus_onoffer_rescind},
+	{CHANNELMSG_REQUESTOFFERS,		0, NULL},
+	{CHANNELMSG_ALLOFFERS_DELIVERED,	1, vmbus_onoffers_delivered},
+	{CHANNELMSG_OPENCHANNEL,		0, NULL},
+	{CHANNELMSG_OPENCHANNEL_RESULT,		1, vmbus_onopen_result},
+	{CHANNELMSG_CLOSECHANNEL,		0, NULL},
+	{CHANNELMSG_GPADL_HEADER,		0, NULL},
+	{CHANNELMSG_GPADL_BODY,			0, NULL},
+	{CHANNELMSG_GPADL_CREATED,		1, vmbus_ongpadl_created},
+	{CHANNELMSG_GPADL_TEARDOWN,		0, NULL},
+	{CHANNELMSG_GPADL_TORNDOWN,		1, vmbus_ongpadl_torndown},
+	{CHANNELMSG_RELID_RELEASED,		0, NULL},
+	{CHANNELMSG_INITIATE_CONTACT,		0, NULL},
+	{CHANNELMSG_VERSION_RESPONSE,		1, vmbus_onversion_response},
+	{CHANNELMSG_UNLOAD,			0, NULL},
 };
 
 /*
@@ -787,7 +749,7 @@ int vmbus_request_offers(void)
 {
 	struct vmbus_channel_message_header *msg;
 	struct vmbus_channel_msginfo *msginfo;
-	int ret, t;
+	int ret;
 
 	msginfo = kmalloc(sizeof(*msginfo) +
 			  sizeof(struct vmbus_channel_message_header),
@@ -795,8 +757,6 @@ int vmbus_request_offers(void)
 	if (!msginfo)
 		return -ENOMEM;
 
-	init_completion(&msginfo->waitevent);
-
 	msg = (struct vmbus_channel_message_header *)msginfo->msg;
 
 	msg->msgtype = CHANNELMSG_REQUESTOFFERS;
@@ -810,14 +770,6 @@ int vmbus_request_offers(void)
 		goto cleanup;
 	}
 
-	t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
-	if (t == 0) {
-		ret = -ETIMEDOUT;
-		goto cleanup;
-	}
-
-
-
 cleanup:
 	kfree(msginfo);
 
@@ -826,9 +778,8 @@ cleanup:
 
 /*
  * Retrieve the (sub) channel on which to send an outgoing request.
- * When a primary channel has multiple sub-channels, we choose a
- * channel whose VCPU binding is closest to the VCPU on which
- * this call is being made.
+ * When a primary channel has multiple sub-channels, we try to
+ * distribute the load equally amongst all available channels.
  */
 struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary)
 {
@@ -836,11 +787,19 @@ struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary)
 	int cur_cpu;
 	struct vmbus_channel *cur_channel;
 	struct vmbus_channel *outgoing_channel = primary;
-	int cpu_distance, new_cpu_distance;
+	int next_channel;
+	int i = 1;
 
 	if (list_empty(&primary->sc_list))
 		return outgoing_channel;
 
+	next_channel = primary->next_oc++;
+
+	if (next_channel > (primary->num_sc)) {
+		primary->next_oc = 0;
+		return outgoing_channel;
+	}
+
 	cur_cpu = hv_context.vp_index[get_cpu()];
 	put_cpu();
 	list_for_each_safe(cur, tmp, &primary->sc_list) {
@@ -851,18 +810,10 @@ struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary)
 		if (cur_channel->target_vp == cur_cpu)
 			return cur_channel;
 
-		cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ?
-				(outgoing_channel->target_vp - cur_cpu) :
-				(cur_cpu - outgoing_channel->target_vp));
-
-		new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ?
-				(cur_channel->target_vp - cur_cpu) :
-				(cur_cpu - cur_channel->target_vp));
-
-		if (cpu_distance < new_cpu_distance)
-			continue;
+		if (i == next_channel)
+			return cur_channel;
 
-		outgoing_channel = cur_channel;
+		i++;
 	}
 
 	return outgoing_channel;
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index a63a795300b9..b27220a425f4 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -216,10 +216,21 @@ int vmbus_connect(void)
 
 cleanup:
 	pr_err("Unable to connect to host\n");
+
 	vmbus_connection.conn_state = DISCONNECTED;
+	vmbus_disconnect();
+
+	kfree(msginfo);
 
-	if (vmbus_connection.work_queue)
+	return ret;
+}
+
+void vmbus_disconnect(void)
+{
+	if (vmbus_connection.work_queue) {
+		drain_workqueue(vmbus_connection.work_queue);
 		destroy_workqueue(vmbus_connection.work_queue);
+	}
 
 	if (vmbus_connection.int_page) {
 		free_pages((unsigned long)vmbus_connection.int_page, 0);
@@ -230,10 +241,6 @@ cleanup:
 	free_pages((unsigned long)vmbus_connection.monitor_pages[1], 0);
 	vmbus_connection.monitor_pages[0] = NULL;
 	vmbus_connection.monitor_pages[1] = NULL;
-
-	kfree(msginfo);
-
-	return ret;
 }
 
 /*
@@ -311,10 +318,8 @@ static void process_chn_event(u32 relid)
 	 */
 	channel = pcpu_relid2channel(relid);
 
-	if (!channel) {
-		pr_err("channel not found for relid - %u\n", relid);
+	if (!channel)
 		return;
-	}
 
 	/*
 	 * A channel once created is persistent even when there
@@ -349,10 +354,7 @@ static void process_chn_event(u32 relid)
 			else
 				bytes_to_read = 0;
 		} while (read_state && (bytes_to_read != 0));
-	} else {
-		pr_err("no channel callback for relid - %u\n", relid);
 	}
-
 }
 
 /*
@@ -420,6 +422,7 @@ int vmbus_post_msg(void *buffer, size_t buflen)
 	union hv_connection_id conn_id;
 	int ret = 0;
 	int retries = 0;
+	u32 msec = 1;
 
 	conn_id.asu32 = 0;
 	conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
@@ -429,13 +432,20 @@ int vmbus_post_msg(void *buffer, size_t buflen)
 	 * insufficient resources. Retry the operation a couple of
 	 * times before giving up.
 	 */
-	while (retries < 10) {
+	while (retries < 20) {
 		ret = hv_post_message(conn_id, 1, buffer, buflen);
 
 		switch (ret) {
+		case HV_STATUS_INVALID_CONNECTION_ID:
+			/*
+			 * We could get this if we send messages too
+			 * frequently.
+			 */
+			ret = -EAGAIN;
+			break;
+		case HV_STATUS_INSUFFICIENT_MEMORY:
 		case HV_STATUS_INSUFFICIENT_BUFFERS:
 			ret = -ENOMEM;
-		case -ENOMEM:
 			break;
 		case HV_STATUS_SUCCESS:
 			return ret;
@@ -445,7 +455,9 @@ int vmbus_post_msg(void *buffer, size_t buflen)
 		}
 
 		retries++;
-		msleep(100);
+		msleep(msec);
+		if (msec < 2048)
+			msec *= 2;
 	}
 	return ret;
 }
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 50e51a51ff8b..d3943bceecc3 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -312,7 +312,11 @@ static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
 	dev->features = CLOCK_EVT_FEAT_ONESHOT;
 	dev->cpumask = cpumask_of(cpu);
 	dev->rating = 1000;
-	dev->owner = THIS_MODULE;
+	/*
+	 * Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
+	 * result in clockevents_config_and_register() taking additional
+	 * references to the hv_vmbus module making it impossible to unload.
+	 */
 
 	dev->set_mode = hv_ce_setmode;
 	dev->set_next_event = hv_ce_set_next_event;
@@ -470,6 +474,20 @@ void hv_synic_init(void *arg)
 }
 
 /*
+ * hv_synic_clockevents_cleanup - Cleanup clockevent devices
+ */
+void hv_synic_clockevents_cleanup(void)
+{
+	int cpu;
+
+	if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
+		return;
+
+	for_each_online_cpu(cpu)
+		clockevents_unbind_device(hv_context.clk_evt[cpu], cpu);
+}
+
+/*
  * hv_synic_cleanup - Cleanup routine for hv_synic_init().
  */
 void hv_synic_cleanup(void *arg)
@@ -477,11 +495,17 @@ void hv_synic_cleanup(void *arg)
 	union hv_synic_sint shared_sint;
 	union hv_synic_simp simp;
 	union hv_synic_siefp siefp;
+	union hv_synic_scontrol sctrl;
 	int cpu = smp_processor_id();
 
 	if (!hv_context.synic_initialized)
 		return;
 
+	/* Turn off clockevent device */
+	if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
+		hv_ce_setmode(CLOCK_EVT_MODE_SHUTDOWN,
+			      hv_context.clk_evt[cpu]);
+
 	rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
 
 	shared_sint.masked = 1;
@@ -502,6 +526,10 @@ void hv_synic_cleanup(void *arg)
 
 	wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
 
-	free_page((unsigned long)hv_context.synic_message_page[cpu]);
-	free_page((unsigned long)hv_context.synic_event_page[cpu]);
+	/* Disable the global synic bit */
+	rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
+	sctrl.enable = 0;
+	wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
+
+	hv_synic_free_cpu(cpu);
 }
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index ff169386b2c7..cb5b7dc9797f 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -428,14 +428,13 @@ struct dm_info_msg {
  * currently hot added. We hot add in multiples of 128M
  * chunks; it is possible that we may not be able to bring
  * online all the pages in the region. The range
- * covered_start_pfn : covered_end_pfn defines the pages that can
+ * covered_end_pfn defines the pages that can
  * be brough online.
  */
 
 struct hv_hotadd_state {
 	struct list_head list;
 	unsigned long start_pfn;
-	unsigned long covered_start_pfn;
 	unsigned long covered_end_pfn;
 	unsigned long ha_end_pfn;
 	unsigned long end_pfn;
@@ -503,6 +502,8 @@ struct hv_dynmem_device {
 	 * Number of pages we have currently ballooned out.
 	 */
 	unsigned int num_pages_ballooned;
+	unsigned int num_pages_onlined;
+	unsigned int num_pages_added;
 
 	/*
 	 * State to manage the ballooning (up) operation.
@@ -534,7 +535,6 @@ struct hv_dynmem_device {
 	struct task_struct *thread;
 
 	struct mutex ha_region_mutex;
-	struct completion waiter_event;
 
 	/*
 	 * A list of hot-add regions.
@@ -554,46 +554,32 @@ static struct hv_dynmem_device dm_device;
 static void post_status(struct hv_dynmem_device *dm);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-static void acquire_region_mutex(bool trylock)
-{
-	if (trylock) {
-		reinit_completion(&dm_device.waiter_event);
-		while (!mutex_trylock(&dm_device.ha_region_mutex))
-			wait_for_completion(&dm_device.waiter_event);
-	} else {
-		mutex_lock(&dm_device.ha_region_mutex);
-	}
-}
-
-static void release_region_mutex(bool trylock)
-{
-	if (trylock) {
-		mutex_unlock(&dm_device.ha_region_mutex);
-	} else {
-		mutex_unlock(&dm_device.ha_region_mutex);
-		complete(&dm_device.waiter_event);
-	}
-}
-
 static int hv_memory_notifier(struct notifier_block *nb, unsigned long val,
 			      void *v)
 {
+	struct memory_notify *mem = (struct memory_notify *)v;
+
 	switch (val) {
 	case MEM_GOING_ONLINE:
-		acquire_region_mutex(true);
+		mutex_lock(&dm_device.ha_region_mutex);
 		break;
 
 	case MEM_ONLINE:
+		dm_device.num_pages_onlined += mem->nr_pages;
 	case MEM_CANCEL_ONLINE:
-		release_region_mutex(true);
+		mutex_unlock(&dm_device.ha_region_mutex);
 		if (dm_device.ha_waiting) {
 			dm_device.ha_waiting = false;
 			complete(&dm_device.ol_waitevent);
 		}
 		break;
 
-	case MEM_GOING_OFFLINE:
 	case MEM_OFFLINE:
+		mutex_lock(&dm_device.ha_region_mutex);
+		dm_device.num_pages_onlined -= mem->nr_pages;
+		mutex_unlock(&dm_device.ha_region_mutex);
+		break;
+	case MEM_GOING_OFFLINE:
 	case MEM_CANCEL_OFFLINE:
 		break;
 	}
@@ -646,7 +632,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 		init_completion(&dm_device.ol_waitevent);
 		dm_device.ha_waiting = true;
 
-		release_region_mutex(false);
+		mutex_unlock(&dm_device.ha_region_mutex);
 		nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn));
 		ret = add_memory(nid, PFN_PHYS((start_pfn)),
 				(HA_CHUNK << PAGE_SHIFT));
@@ -665,6 +651,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 			}
 			has->ha_end_pfn -= HA_CHUNK;
 			has->covered_end_pfn -=  processed_pfn;
+			mutex_lock(&dm_device.ha_region_mutex);
 			break;
 		}
 
@@ -675,7 +662,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 		 * have not been "onlined" within the allowed time.
 		 */
 		wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
-		acquire_region_mutex(false);
+		mutex_lock(&dm_device.ha_region_mutex);
 		post_status(&dm_device);
 	}
 
@@ -691,8 +678,7 @@ static void hv_online_page(struct page *pg)
 
 	list_for_each(cur, &dm_device.ha_region_list) {
 		has = list_entry(cur, struct hv_hotadd_state, list);
-		cur_start_pgp = (unsigned long)
-				pfn_to_page(has->covered_start_pfn);
+		cur_start_pgp = (unsigned long)pfn_to_page(has->start_pfn);
 		cur_end_pgp = (unsigned long)pfn_to_page(has->covered_end_pfn);
 
 		if (((unsigned long)pg >= cur_start_pgp) &&
@@ -704,7 +690,6 @@ static void hv_online_page(struct page *pg)
 			__online_page_set_limits(pg);
 			__online_page_increment_counters(pg);
 			__online_page_free(pg);
-			has->covered_start_pfn++;
 		}
 	}
 }
@@ -748,10 +733,9 @@ static bool pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt)
 		 * is, update it.
 		 */
 
-		if (has->covered_end_pfn != start_pfn) {
+		if (has->covered_end_pfn != start_pfn)
 			has->covered_end_pfn = start_pfn;
-			has->covered_start_pfn = start_pfn;
-		}
+
 		return true;
 
 	}
@@ -794,9 +778,18 @@ static unsigned long handle_pg_range(unsigned long pg_start,
 			pgs_ol = has->ha_end_pfn - start_pfn;
 			if (pgs_ol > pfn_cnt)
 				pgs_ol = pfn_cnt;
-			hv_bring_pgs_online(start_pfn, pgs_ol);
+
+			/*
+			 * Check if the corresponding memory block is already
+			 * online by checking its last previously backed page.
+			 * In case it is we need to bring rest (which was not
+			 * backed previously) online too.
+			 */
+			if (start_pfn > has->start_pfn &&
+			    !PageReserved(pfn_to_page(start_pfn - 1)))
+				hv_bring_pgs_online(start_pfn, pgs_ol);
+
 			has->covered_end_pfn +=  pgs_ol;
-			has->covered_start_pfn +=  pgs_ol;
 			pfn_cnt -= pgs_ol;
 		}
 
@@ -857,7 +850,6 @@ static unsigned long process_hot_add(unsigned long pg_start,
 		list_add_tail(&ha_region->list, &dm_device.ha_region_list);
 		ha_region->start_pfn = rg_start;
 		ha_region->ha_end_pfn = rg_start;
-		ha_region->covered_start_pfn = pg_start;
 		ha_region->covered_end_pfn = pg_start;
 		ha_region->end_pfn = rg_start + rg_size;
 	}
@@ -886,7 +878,7 @@ static void hot_add_req(struct work_struct *dummy)
 	resp.hdr.size = sizeof(struct dm_hot_add_response);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-	acquire_region_mutex(false);
+	mutex_lock(&dm_device.ha_region_mutex);
 	pg_start = dm->ha_wrk.ha_page_range.finfo.start_page;
 	pfn_cnt = dm->ha_wrk.ha_page_range.finfo.page_cnt;
 
@@ -918,7 +910,9 @@ static void hot_add_req(struct work_struct *dummy)
 	if (do_hot_add)
 		resp.page_count = process_hot_add(pg_start, pfn_cnt,
 						rg_start, rg_sz);
-	release_region_mutex(false);
+
+	dm->num_pages_added += resp.page_count;
+	mutex_unlock(&dm_device.ha_region_mutex);
 #endif
 	/*
 	 * The result field of the response structure has the
@@ -982,8 +976,8 @@ static unsigned long compute_balloon_floor(void)
 	 *     128        72    (1/2)
 	 *     512       168    (1/4)
 	 *    2048       360    (1/8)
-	 *    8192       768    (1/16)
-	 *   32768      1536	(1/32)
+	 *    8192       744    (1/16)
+	 *   32768      1512	(1/32)
 	 */
 	if (totalram_pages < MB2PAGES(128))
 		min_pages = MB2PAGES(8) + (totalram_pages >> 1);
@@ -992,9 +986,9 @@ static unsigned long compute_balloon_floor(void)
 	else if (totalram_pages < MB2PAGES(2048))
 		min_pages = MB2PAGES(104) + (totalram_pages >> 3);
 	else if (totalram_pages < MB2PAGES(8192))
-		min_pages = MB2PAGES(256) + (totalram_pages >> 4);
+		min_pages = MB2PAGES(232) + (totalram_pages >> 4);
 	else
-		min_pages = MB2PAGES(512) + (totalram_pages >> 5);
+		min_pages = MB2PAGES(488) + (totalram_pages >> 5);
 #undef MB2PAGES
 	return min_pages;
 }
@@ -1031,17 +1025,21 @@ static void post_status(struct hv_dynmem_device *dm)
 	status.hdr.trans_id = atomic_inc_return(&trans_id);
 
 	/*
-	 * The host expects the guest to report free memory.
-	 * Further, the host expects the pressure information to
-	 * include the ballooned out pages.
-	 * For a given amount of memory that we are managing, we
-	 * need to compute a floor below which we should not balloon.
-	 * Compute this and add it to the pressure report.
+	 * The host expects the guest to report free and committed memory.
+	 * Furthermore, the host expects the pressure information to include
+	 * the ballooned out pages. For a given amount of memory that we are
+	 * managing we need to compute a floor below which we should not
+	 * balloon. Compute this and add it to the pressure report.
+	 * We also need to report all offline pages (num_pages_added -
+	 * num_pages_onlined) as committed to the host, otherwise it can try
+	 * asking us to balloon them out.
 	 */
 	status.num_avail = val.freeram;
 	status.num_committed = vm_memory_committed() +
-				dm->num_pages_ballooned +
-				compute_balloon_floor();
+		dm->num_pages_ballooned +
+		(dm->num_pages_added > dm->num_pages_onlined ?
+		 dm->num_pages_added - dm->num_pages_onlined : 0) +
+		compute_balloon_floor();
 
 	/*
 	 * If our transaction ID is no longer current, just don't
@@ -1083,11 +1081,12 @@ static void free_balloon_pages(struct hv_dynmem_device *dm,
 
 
 
-static int  alloc_balloon_pages(struct hv_dynmem_device *dm, int num_pages,
-			 struct dm_balloon_response *bl_resp, int alloc_unit,
-			 bool *alloc_error)
+static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
+					unsigned int num_pages,
+					struct dm_balloon_response *bl_resp,
+					int alloc_unit)
 {
-	int i = 0;
+	unsigned int i = 0;
 	struct page *pg;
 
 	if (num_pages < alloc_unit)
@@ -1106,11 +1105,8 @@ static int  alloc_balloon_pages(struct hv_dynmem_device *dm, int num_pages,
 				__GFP_NOMEMALLOC | __GFP_NOWARN,
 				get_order(alloc_unit << PAGE_SHIFT));
 
-		if (!pg) {
-			*alloc_error = true;
+		if (!pg)
 			return i * alloc_unit;
-		}
-
 
 		dm->num_pages_ballooned += alloc_unit;
 
@@ -1137,14 +1133,15 @@ static int  alloc_balloon_pages(struct hv_dynmem_device *dm, int num_pages,
 
 static void balloon_up(struct work_struct *dummy)
 {
-	int num_pages = dm_device.balloon_wrk.num_pages;
-	int num_ballooned = 0;
+	unsigned int num_pages = dm_device.balloon_wrk.num_pages;
+	unsigned int num_ballooned = 0;
 	struct dm_balloon_response *bl_resp;
 	int alloc_unit;
 	int ret;
-	bool alloc_error;
 	bool done = false;
 	int i;
+	struct sysinfo val;
+	unsigned long floor;
 
 	/* The host balloons pages in 2M granularity. */
 	WARN_ON_ONCE(num_pages % PAGES_IN_2M != 0);
@@ -1155,6 +1152,15 @@ static void balloon_up(struct work_struct *dummy)
 	 */
 	alloc_unit = 512;
 
+	si_meminfo(&val);
+	floor = compute_balloon_floor();
+
+	/* Refuse to balloon below the floor, keep the 2M granularity. */
+	if (val.freeram < num_pages || val.freeram - num_pages < floor) {
+		num_pages = val.freeram > floor ? (val.freeram - floor) : 0;
+		num_pages -= num_pages % PAGES_IN_2M;
+	}
+
 	while (!done) {
 		bl_resp = (struct dm_balloon_response *)send_buffer;
 		memset(send_buffer, 0, PAGE_SIZE);
@@ -1164,18 +1170,15 @@ static void balloon_up(struct work_struct *dummy)
 
 
 		num_pages -= num_ballooned;
-		alloc_error = false;
 		num_ballooned = alloc_balloon_pages(&dm_device, num_pages,
-						bl_resp, alloc_unit,
-						 &alloc_error);
+						    bl_resp, alloc_unit);
 
 		if (alloc_unit != 1 && num_ballooned == 0) {
 			alloc_unit = 1;
 			continue;
 		}
 
-		if ((alloc_unit == 1 && alloc_error) ||
-			(num_ballooned == num_pages)) {
+		if (num_ballooned == 0 || num_ballooned == num_pages) {
 			bl_resp->more_pages = 0;
 			done = true;
 			dm_device.state = DM_INITIALIZED;
@@ -1414,7 +1417,8 @@ static void balloon_onchannelcallback(void *context)
 static int balloon_probe(struct hv_device *dev,
 			const struct hv_vmbus_device_id *dev_id)
 {
-	int ret, t;
+	int ret;
+	unsigned long t;
 	struct dm_version_request version_req;
 	struct dm_capabilities cap_msg;
 
@@ -1439,7 +1443,6 @@ static int balloon_probe(struct hv_device *dev,
 	dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN7;
 	init_completion(&dm_device.host_event);
 	init_completion(&dm_device.config_event);
-	init_completion(&dm_device.waiter_event);
 	INIT_LIST_HEAD(&dm_device.ha_region_list);
 	mutex_init(&dm_device.ha_region_mutex);
 	INIT_WORK(&dm_device.balloon_wrk.wrk, balloon_up);
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 3b9c9ef0deb8..7994ec2e4151 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -340,12 +340,8 @@ static int util_probe(struct hv_device *dev,
 
 	set_channel_read_state(dev->channel, false);
 
-	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
-			srv->util_cb, dev->channel);
-	if (ret)
-		goto error;
-
 	hv_set_drvdata(dev, srv);
+
 	/*
 	 * Based on the host; initialize the framework and
 	 * service version numbers we will negotiate.
@@ -365,6 +361,11 @@ static int util_probe(struct hv_device *dev,
 		hb_srv_version = HB_VERSION;
 	}
 
+	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
+			srv->util_cb, dev->channel);
+	if (ret)
+		goto error;
+
 	return 0;
 
 error:
@@ -379,9 +380,9 @@ static int util_remove(struct hv_device *dev)
 {
 	struct hv_util_service *srv = hv_get_drvdata(dev);
 
-	vmbus_close(dev->channel);
 	if (srv->util_deinit)
 		srv->util_deinit();
+	vmbus_close(dev->channel);
 	kfree(srv->recv_buffer);
 
 	return 0;
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 44b1c9424712..887287ad411f 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -49,6 +49,17 @@ enum hv_cpuid_function {
 	HVCPUID_IMPLEMENTATION_LIMITS		= 0x40000005,
 };
 
+#define  HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE   0x400
+
+#define HV_X64_MSR_CRASH_P0   0x40000100
+#define HV_X64_MSR_CRASH_P1   0x40000101
+#define HV_X64_MSR_CRASH_P2   0x40000102
+#define HV_X64_MSR_CRASH_P3   0x40000103
+#define HV_X64_MSR_CRASH_P4   0x40000104
+#define HV_X64_MSR_CRASH_CTL  0x40000105
+
+#define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)
+
 /* Define version of the synthetic interrupt controller. */
 #define HV_SYNIC_VERSION		(1)
 
@@ -572,6 +583,8 @@ extern void hv_synic_init(void *irqarg);
 
 extern void hv_synic_cleanup(void *arg);
 
+extern void hv_synic_clockevents_cleanup(void);
+
 /*
  * Host version information.
  */
@@ -672,6 +685,23 @@ struct vmbus_msginfo {
 
 extern struct vmbus_connection vmbus_connection;
 
+enum vmbus_message_handler_type {
+	/* The related handler can sleep. */
+	VMHT_BLOCKING = 0,
+
+	/* The related handler must NOT sleep. */
+	VMHT_NON_BLOCKING = 1,
+};
+
+struct vmbus_channel_message_table_entry {
+	enum vmbus_channel_message_type message_type;
+	enum vmbus_message_handler_type handler_type;
+	void (*message_handler)(struct vmbus_channel_message_header *msg);
+};
+
+extern struct vmbus_channel_message_table_entry
+	channel_message_table[CHANNELMSG_COUNT];
+
 /* General vmbus interface */
 
 struct hv_device *vmbus_device_create(const uuid_le *type,
@@ -692,6 +722,7 @@ void vmbus_free_channels(void);
 /* Connection interface */
 
 int vmbus_connect(void);
+void vmbus_disconnect(void);
 
 int vmbus_post_msg(void *buffer, size_t buflen);
 
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index f518b8d7a5b5..c85235e9f245 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -33,9 +33,12 @@
 #include <linux/hyperv.h>
 #include <linux/kernel_stat.h>
 #include <linux/clockchips.h>
+#include <linux/cpu.h>
 #include <asm/hyperv.h>
 #include <asm/hypervisor.h>
 #include <asm/mshyperv.h>
+#include <linux/notifier.h>
+#include <linux/ptrace.h>
 #include "hyperv_vmbus.h"
 
 static struct acpi_device  *hv_acpi_dev;
@@ -44,6 +47,31 @@ static struct tasklet_struct msg_dpc;
 static struct completion probe_event;
 static int irq;
 
+
+static int hyperv_panic_event(struct notifier_block *nb,
+			unsigned long event, void *ptr)
+{
+	struct pt_regs *regs;
+
+	regs = current_pt_regs();
+
+	wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip);
+	wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax);
+	wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx);
+	wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx);
+	wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx);
+
+	/*
+	 * Let Hyper-V know there is crash data available
+	 */
+	wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block hyperv_panic_block = {
+	.notifier_call = hyperv_panic_event,
+};
+
 struct resource hyperv_mmio = {
 	.name  = "hyperv mmio",
 	.flags = IORESOURCE_MEM,
@@ -507,14 +535,26 @@ static int vmbus_probe(struct device *child_device)
  */
 static int vmbus_remove(struct device *child_device)
 {
-	struct hv_driver *drv = drv_to_hv_drv(child_device->driver);
+	struct hv_driver *drv;
 	struct hv_device *dev = device_to_hv_device(child_device);
-
-	if (drv->remove)
-		drv->remove(dev);
-	else
-		pr_err("remove not set for driver %s\n",
-			dev_name(child_device));
+	u32 relid = dev->channel->offermsg.child_relid;
+
+	if (child_device->driver) {
+		drv = drv_to_hv_drv(child_device->driver);
+		if (drv->remove)
+			drv->remove(dev);
+		else {
+			hv_process_channel_removal(dev->channel, relid);
+			pr_err("remove not set for driver %s\n",
+				dev_name(child_device));
+		}
+	} else {
+		/*
+		 * We don't have a driver for this device; deal with the
+		 * rescind message by removing the channel.
+		 */
+		hv_process_channel_removal(dev->channel, relid);
+	}
 
 	return 0;
 }
@@ -573,6 +613,10 @@ static void vmbus_onmessage_work(struct work_struct *work)
 {
 	struct onmessage_work_context *ctx;
 
+	/* Do not process messages if we're in DISCONNECTED state */
+	if (vmbus_connection.conn_state == DISCONNECTED)
+		return;
+
 	ctx = container_of(work, struct onmessage_work_context,
 			   work);
 	vmbus_onmessage(&ctx->msg);
@@ -613,21 +657,36 @@ static void vmbus_on_msg_dpc(unsigned long data)
 	void *page_addr = hv_context.synic_message_page[cpu];
 	struct hv_message *msg = (struct hv_message *)page_addr +
 				  VMBUS_MESSAGE_SINT;
+	struct vmbus_channel_message_header *hdr;
+	struct vmbus_channel_message_table_entry *entry;
 	struct onmessage_work_context *ctx;
 
 	while (1) {
-		if (msg->header.message_type == HVMSG_NONE) {
+		if (msg->header.message_type == HVMSG_NONE)
 			/* no msg */
 			break;
-		} else {
+
+		hdr = (struct vmbus_channel_message_header *)msg->u.payload;
+
+		if (hdr->msgtype >= CHANNELMSG_COUNT) {
+			WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
+			goto msg_handled;
+		}
+
+		entry = &channel_message_table[hdr->msgtype];
+		if (entry->handler_type	== VMHT_BLOCKING) {
 			ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
 			if (ctx == NULL)
 				continue;
+
 			INIT_WORK(&ctx->work, vmbus_onmessage_work);
 			memcpy(&ctx->msg, msg, sizeof(*msg));
+
 			queue_work(vmbus_connection.work_queue, &ctx->work);
-		}
+		} else
+			entry->message_handler(hdr);
 
+msg_handled:
 		msg->header.message_type = HVMSG_NONE;
 
 		/*
@@ -704,6 +763,39 @@ static void vmbus_isr(void)
 	}
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
+static int hyperv_cpu_disable(void)
+{
+	return -ENOSYS;
+}
+
+static void hv_cpu_hotplug_quirk(bool vmbus_loaded)
+{
+	static void *previous_cpu_disable;
+
+	/*
+	 * Offlining a CPU when running on newer hypervisors (WS2012R2, Win8,
+	 * ...) is not supported at this moment as channel interrupts are
+	 * distributed across all of them.
+	 */
+
+	if ((vmbus_proto_version == VERSION_WS2008) ||
+	    (vmbus_proto_version == VERSION_WIN7))
+		return;
+
+	if (vmbus_loaded) {
+		previous_cpu_disable = smp_ops.cpu_disable;
+		smp_ops.cpu_disable = hyperv_cpu_disable;
+		pr_notice("CPU offlining is not supported by hypervisor\n");
+	} else if (previous_cpu_disable)
+		smp_ops.cpu_disable = previous_cpu_disable;
+}
+#else
+static void hv_cpu_hotplug_quirk(bool vmbus_loaded)
+{
+}
+#endif
+
 /*
  * vmbus_bus_init -Main vmbus driver initialization routine.
  *
@@ -744,6 +836,16 @@ static int vmbus_bus_init(int irq)
 	if (ret)
 		goto err_alloc;
 
+	hv_cpu_hotplug_quirk(true);
+
+	/*
+	 * Only register if the crash MSRs are available
+	 */
+	if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
+		atomic_notifier_chain_register(&panic_notifier_list,
+					       &hyperv_panic_block);
+	}
+
 	vmbus_request_offers();
 
 	return 0;
@@ -840,10 +942,8 @@ int vmbus_device_register(struct hv_device *child_device_obj)
 {
 	int ret = 0;
 
-	static atomic_t device_num = ATOMIC_INIT(0);
-
-	dev_set_name(&child_device_obj->device, "vmbus_0_%d",
-		     atomic_inc_return(&device_num));
+	dev_set_name(&child_device_obj->device, "vmbus_%d",
+		     child_device_obj->channel->id);
 
 	child_device_obj->device.bus = &hv_bus;
 	child_device_obj->device.parent = &hv_acpi_dev->dev;
@@ -992,11 +1092,19 @@ cleanup:
 
 static void __exit vmbus_exit(void)
 {
+	int cpu;
+
+	vmbus_connection.conn_state = DISCONNECTED;
+	hv_synic_clockevents_cleanup();
 	hv_remove_vmbus_irq();
 	vmbus_free_channels();
 	bus_unregister(&hv_bus);
 	hv_cleanup();
+	for_each_online_cpu(cpu)
+		smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
 	acpi_bus_unregister_driver(&vmbus_acpi_driver);
+	hv_cpu_hotplug_quirk(false);
+	vmbus_disconnect();
 }
 
 
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
new file mode 100644
index 000000000000..fc1f1ae7a49d
--- /dev/null
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -0,0 +1,61 @@
+#
+# Coresight configuration
+#
+menuconfig CORESIGHT
+	bool "CoreSight Tracing Support"
+	select ARM_AMBA
+	help
+	  This framework provides a kernel interface for the CoreSight debug
+	  and trace drivers to register themselves with. It's intended to build
+	  a topological view of the CoreSight components based on a DT
+	  specification and configure the right serie of components when a
+	  trace source gets enabled.
+
+if CORESIGHT
+config CORESIGHT_LINKS_AND_SINKS
+	bool "CoreSight Link and Sink drivers"
+	help
+	  This enables support for CoreSight link and sink drivers that are
+	  responsible for transporting and collecting the trace data
+	  respectively.  Link and sinks are dynamically aggregated with a trace
+	  entity at run time to form a complete trace path.
+
+config CORESIGHT_LINK_AND_SINK_TMC
+	bool "Coresight generic TMC driver"
+	depends on CORESIGHT_LINKS_AND_SINKS
+	help
+	  This enables support for the Trace Memory Controller driver.
+	  Depending on its configuration the device can act as a link (embedded
+	  trace router - ETR) or sink (embedded trace FIFO).  The driver
+	  complies with the generic implementation of the component without
+	  special enhancement or added features.
+
+config CORESIGHT_SINK_TPIU
+	bool "Coresight generic TPIU driver"
+	depends on CORESIGHT_LINKS_AND_SINKS
+	help
+	  This enables support for the Trace Port Interface Unit driver,
+	  responsible for bridging the gap between the on-chip coresight
+	  components and a trace for bridging the gap between the on-chip
+	  coresight components and a trace port collection engine, typically
+	  connected to an external host for use case capturing more traces than
+	  the on-board coresight memory can handle.
+
+config CORESIGHT_SINK_ETBV10
+	bool "Coresight ETBv1.0 driver"
+	depends on CORESIGHT_LINKS_AND_SINKS
+	help
+	  This enables support for the Embedded Trace Buffer version 1.0 driver
+	  that complies with the generic implementation of the component without
+	  special enhancement or added features.
+
+config CORESIGHT_SOURCE_ETM3X
+	bool "CoreSight Embedded Trace Macrocell 3.x driver"
+	depends on !ARM64
+	select CORESIGHT_LINKS_AND_SINKS
+	help
+	  This driver provides support for processor ETM3.x and PTM1.x modules,
+	  which allows tracing the instructions that a processor is executing
+	  This is primarily useful for instruction level tracing.  Depending
+	  the ETM version data tracing may also be available.
+endif
diff --git a/drivers/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 4b4bec890ef5..4b4bec890ef5 100644
--- a/drivers/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
diff --git a/drivers/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index c9acd406f0d0..40049869aecd 100644
--- a/drivers/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -313,8 +313,8 @@ static ssize_t etb_read(struct file *file, char __user *data,
 
 	*ppos += len;
 
-	dev_dbg(drvdata->dev, "%s: %d bytes copied, %d bytes left\n",
-		__func__, len, (int) (depth * 4 - *ppos));
+	dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
+		__func__, len, (int)(depth * 4 - *ppos));
 	return len;
 }
 
diff --git a/drivers/coresight/coresight-etm-cp14.c b/drivers/hwtracing/coresight/coresight-etm-cp14.c
index 12a220682117..12a220682117 100644
--- a/drivers/coresight/coresight-etm-cp14.c
+++ b/drivers/hwtracing/coresight/coresight-etm-cp14.c
diff --git a/drivers/coresight/coresight-etm.h b/drivers/hwtracing/coresight/coresight-etm.h
index 501c5fac8a45..501c5fac8a45 100644
--- a/drivers/coresight/coresight-etm.h
+++ b/drivers/hwtracing/coresight/coresight-etm.h
diff --git a/drivers/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c
index c965f5724abd..c965f5724abd 100644
--- a/drivers/coresight/coresight-etm3x.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x.c
diff --git a/drivers/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 3db36f70b666..3db36f70b666 100644
--- a/drivers/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
diff --git a/drivers/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 62fcd98cc7cf..62fcd98cc7cf 100644
--- a/drivers/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
diff --git a/drivers/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index cdf05537d574..75b9abd804e6 100644
--- a/drivers/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -107,7 +107,7 @@ static int replicator_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct of_device_id replicator_match[] = {
+static const struct of_device_id replicator_match[] = {
 	{.compatible = "arm,coresight-replicator"},
 	{}
 };
diff --git a/drivers/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 3ff232f9ddf7..7147f3dd363c 100644
--- a/drivers/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -533,8 +533,8 @@ static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
 
 	*ppos += len;
 
-	dev_dbg(drvdata->dev, "%s: %d bytes copied, %d bytes left\n",
-		__func__, len, (int) (drvdata->size - *ppos));
+	dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
+		__func__, len, (int)(drvdata->size - *ppos));
 	return len;
 }
 
@@ -565,6 +565,59 @@ static const struct file_operations tmc_fops = {
 	.llseek		= no_llseek,
 };
 
+static ssize_t status_show(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	int ret;
+	unsigned long flags;
+	u32 tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg;
+	u32 tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr;
+	u32 devid;
+	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+	ret = clk_prepare_enable(drvdata->clk);
+	if (ret)
+		goto out;
+
+	spin_lock_irqsave(&drvdata->spinlock, flags);
+	CS_UNLOCK(drvdata->base);
+
+	tmc_rsz = readl_relaxed(drvdata->base + TMC_RSZ);
+	tmc_sts = readl_relaxed(drvdata->base + TMC_STS);
+	tmc_rrp = readl_relaxed(drvdata->base + TMC_RRP);
+	tmc_rwp = readl_relaxed(drvdata->base + TMC_RWP);
+	tmc_trg = readl_relaxed(drvdata->base + TMC_TRG);
+	tmc_ctl = readl_relaxed(drvdata->base + TMC_CTL);
+	tmc_ffsr = readl_relaxed(drvdata->base + TMC_FFSR);
+	tmc_ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
+	tmc_mode = readl_relaxed(drvdata->base + TMC_MODE);
+	tmc_pscr = readl_relaxed(drvdata->base + TMC_PSCR);
+	devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
+
+	CS_LOCK(drvdata->base);
+	spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+	clk_disable_unprepare(drvdata->clk);
+
+	return sprintf(buf,
+		       "Depth:\t\t0x%x\n"
+		       "Status:\t\t0x%x\n"
+		       "RAM read ptr:\t0x%x\n"
+		       "RAM wrt ptr:\t0x%x\n"
+		       "Trigger cnt:\t0x%x\n"
+		       "Control:\t0x%x\n"
+		       "Flush status:\t0x%x\n"
+		       "Flush ctrl:\t0x%x\n"
+		       "Mode:\t\t0x%x\n"
+		       "PSRC:\t\t0x%x\n"
+		       "DEVID:\t\t0x%x\n",
+			tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg,
+			tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr, devid);
+out:
+	return -EINVAL;
+}
+static DEVICE_ATTR_RO(status);
+
 static ssize_t trigger_cntr_show(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
@@ -593,18 +646,21 @@ static DEVICE_ATTR_RW(trigger_cntr);
 
 static struct attribute *coresight_etb_attrs[] = {
 	&dev_attr_trigger_cntr.attr,
+	&dev_attr_status.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(coresight_etb);
 
 static struct attribute *coresight_etr_attrs[] = {
 	&dev_attr_trigger_cntr.attr,
+	&dev_attr_status.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(coresight_etr);
 
 static struct attribute *coresight_etf_attrs[] = {
 	&dev_attr_trigger_cntr.attr,
+	&dev_attr_status.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(coresight_etf);
diff --git a/drivers/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 3b33af2416bb..3b33af2416bb 100644
--- a/drivers/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
diff --git a/drivers/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index c5def9382357..894531d315b8 100644
--- a/drivers/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -305,7 +305,9 @@ static int coresight_build_paths(struct coresight_device *csdev,
 
 	list_add(&csdev->path_link, path);
 
-	if (csdev->type == CORESIGHT_DEV_TYPE_SINK && csdev->activated) {
+	if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
+	    csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
+	    csdev->activated) {
 		if (enable)
 			ret = coresight_enable_path(path);
 		else
diff --git a/drivers/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index 6f75e9d5b6fb..35e51ce93a5c 100644
--- a/drivers/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -22,6 +22,7 @@
 #include <linux/platform_device.h>
 #include <linux/amba/bus.h>
 #include <linux/coresight.h>
+#include <linux/cpumask.h>
 #include <asm/smp_plat.h>
 
 
@@ -104,7 +105,7 @@ static int of_coresight_alloc_memory(struct device *dev,
 struct coresight_platform_data *of_get_coresight_platform_data(
 				struct device *dev, struct device_node *node)
 {
-	int i = 0, ret = 0;
+	int i = 0, ret = 0, cpu;
 	struct coresight_platform_data *pdata;
 	struct of_endpoint endpoint, rendpoint;
 	struct device *rdev;
@@ -178,17 +179,10 @@ struct coresight_platform_data *of_get_coresight_platform_data(
 	/* Affinity defaults to CPU0 */
 	pdata->cpu = 0;
 	dn = of_parse_phandle(node, "cpu", 0);
-	if (dn) {
-		const u32 *cell;
-		int len, index;
-		u64 hwid;
-
-		cell = of_get_property(dn, "reg", &len);
-		if (cell) {
-			hwid = of_read_number(cell, of_n_addr_cells(dn));
-			index = get_logical_index(hwid);
-			if (index != -EINVAL)
-				pdata->cpu = index;
+	for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
+		if (dn == of_get_cpu_node(cpu, NULL)) {
+			pdata->cpu = cpu;
+			break;
 		}
 	}
 
diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
index 0af7361e377f..de36237d7c6b 100644
--- a/drivers/mcb/mcb-pci.c
+++ b/drivers/mcb/mcb-pci.c
@@ -56,9 +56,9 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE,
 				 KBUILD_MODNAME);
-	if (IS_ERR(res)) {
+	if (!res) {
 		dev_err(&pdev->dev, "Failed to request PCI memory\n");
-		ret = PTR_ERR(res);
+		ret = -EBUSY;
 		goto out_disable;
 	}
 
diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig
index 191383d8c94d..868036f70f8f 100644
--- a/drivers/memory/Kconfig
+++ b/drivers/memory/Kconfig
@@ -83,6 +83,15 @@ config FSL_IFC
 	bool
 	depends on FSL_SOC
 
+config JZ4780_NEMC
+	bool "Ingenic JZ4780 SoC NEMC driver"
+	default y
+	depends on MACH_JZ4780
+	help
+	  This driver is for the NAND/External Memory Controller (NEMC) in
+	  the Ingenic JZ4780. This controller is used to handle external
+	  memory devices such as NAND and SRAM.
+
 source "drivers/memory/tegra/Kconfig"
 
 endif
diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile
index 6b6548124473..b670441e3cdf 100644
--- a/drivers/memory/Makefile
+++ b/drivers/memory/Makefile
@@ -13,5 +13,6 @@ obj-$(CONFIG_FSL_CORENET_CF)	+= fsl-corenet-cf.o
 obj-$(CONFIG_FSL_IFC)		+= fsl_ifc.o
 obj-$(CONFIG_MVEBU_DEVBUS)	+= mvebu-devbus.o
 obj-$(CONFIG_TEGRA20_MC)	+= tegra20-mc.o
+obj-$(CONFIG_JZ4780_NEMC)	+= jz4780-nemc.o
 
 obj-$(CONFIG_TEGRA_MC)		+= tegra/
diff --git a/drivers/memory/jz4780-nemc.c b/drivers/memory/jz4780-nemc.c
new file mode 100644
index 000000000000..919d1925acb9
--- /dev/null
+++ b/drivers/memory/jz4780-nemc.c
@@ -0,0 +1,391 @@
+/*
+ * JZ4780 NAND/external memory controller (NEMC)
+ *
+ * Copyright (c) 2015 Imagination Technologies
+ * Author: Alex Smith <alex@alex-smith.me.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/math64.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include <linux/jz4780-nemc.h>
+
+#define NEMC_SMCRn(n)		(0x14 + (((n) - 1) * 4))
+#define NEMC_NFCSR		0x50
+
+#define NEMC_SMCR_SMT		BIT(0)
+#define NEMC_SMCR_BW_SHIFT	6
+#define NEMC_SMCR_BW_MASK	(0x3 << NEMC_SMCR_BW_SHIFT)
+#define NEMC_SMCR_BW_8		(0 << 6)
+#define NEMC_SMCR_TAS_SHIFT	8
+#define NEMC_SMCR_TAS_MASK	(0xf << NEMC_SMCR_TAS_SHIFT)
+#define NEMC_SMCR_TAH_SHIFT	12
+#define NEMC_SMCR_TAH_MASK	(0xf << NEMC_SMCR_TAH_SHIFT)
+#define NEMC_SMCR_TBP_SHIFT	16
+#define NEMC_SMCR_TBP_MASK	(0xf << NEMC_SMCR_TBP_SHIFT)
+#define NEMC_SMCR_TAW_SHIFT	20
+#define NEMC_SMCR_TAW_MASK	(0xf << NEMC_SMCR_TAW_SHIFT)
+#define NEMC_SMCR_TSTRV_SHIFT	24
+#define NEMC_SMCR_TSTRV_MASK	(0x3f << NEMC_SMCR_TSTRV_SHIFT)
+
+#define NEMC_NFCSR_NFEn(n)	BIT(((n) - 1) << 1)
+#define NEMC_NFCSR_NFCEn(n)	BIT((((n) - 1) << 1) + 1)
+#define NEMC_NFCSR_TNFEn(n)	BIT(16 + (n) - 1)
+
+struct jz4780_nemc {
+	spinlock_t lock;
+	struct device *dev;
+	void __iomem *base;
+	struct clk *clk;
+	uint32_t clk_period;
+	unsigned long banks_present;
+};
+
+/**
+ * jz4780_nemc_num_banks() - count the number of banks referenced by a device
+ * @dev: device to count banks for, must be a child of the NEMC.
+ *
+ * Return: The number of unique NEMC banks referred to by the specified NEMC
+ * child device. Unique here means that a device that references the same bank
+ * multiple times in the its "reg" property will only count once.
+ */
+unsigned int jz4780_nemc_num_banks(struct device *dev)
+{
+	const __be32 *prop;
+	unsigned int bank, count = 0;
+	unsigned long referenced = 0;
+	int i = 0;
+
+	while ((prop = of_get_address(dev->of_node, i++, NULL, NULL))) {
+		bank = of_read_number(prop, 1);
+		if (!(referenced & BIT(bank))) {
+			referenced |= BIT(bank);
+			count++;
+		}
+	}
+
+	return count;
+}
+EXPORT_SYMBOL(jz4780_nemc_num_banks);
+
+/**
+ * jz4780_nemc_set_type() - set the type of device connected to a bank
+ * @dev: child device of the NEMC.
+ * @bank: bank number to configure.
+ * @type: type of device connected to the bank.
+ */
+void jz4780_nemc_set_type(struct device *dev, unsigned int bank,
+			  enum jz4780_nemc_bank_type type)
+{
+	struct jz4780_nemc *nemc = dev_get_drvdata(dev->parent);
+	uint32_t nfcsr;
+
+	nfcsr = readl(nemc->base + NEMC_NFCSR);
+
+	/* TODO: Support toggle NAND devices. */
+	switch (type) {
+	case JZ4780_NEMC_BANK_SRAM:
+		nfcsr &= ~(NEMC_NFCSR_TNFEn(bank) | NEMC_NFCSR_NFEn(bank));
+		break;
+	case JZ4780_NEMC_BANK_NAND:
+		nfcsr &= ~NEMC_NFCSR_TNFEn(bank);
+		nfcsr |= NEMC_NFCSR_NFEn(bank);
+		break;
+	}
+
+	writel(nfcsr, nemc->base + NEMC_NFCSR);
+}
+EXPORT_SYMBOL(jz4780_nemc_set_type);
+
+/**
+ * jz4780_nemc_assert() - (de-)assert a NAND device's chip enable pin
+ * @dev: child device of the NEMC.
+ * @bank: bank number of device.
+ * @assert: whether the chip enable pin should be asserted.
+ *
+ * (De-)asserts the chip enable pin for the NAND device connected to the
+ * specified bank.
+ */
+void jz4780_nemc_assert(struct device *dev, unsigned int bank, bool assert)
+{
+	struct jz4780_nemc *nemc = dev_get_drvdata(dev->parent);
+	uint32_t nfcsr;
+
+	nfcsr = readl(nemc->base + NEMC_NFCSR);
+
+	if (assert)
+		nfcsr |= NEMC_NFCSR_NFCEn(bank);
+	else
+		nfcsr &= ~NEMC_NFCSR_NFCEn(bank);
+
+	writel(nfcsr, nemc->base + NEMC_NFCSR);
+}
+EXPORT_SYMBOL(jz4780_nemc_assert);
+
+static uint32_t jz4780_nemc_clk_period(struct jz4780_nemc *nemc)
+{
+	unsigned long rate;
+
+	rate = clk_get_rate(nemc->clk);
+	if (!rate)
+		return 0;
+
+	/* Return in picoseconds. */
+	return div64_ul(1000000000000ull, rate);
+}
+
+static uint32_t jz4780_nemc_ns_to_cycles(struct jz4780_nemc *nemc, uint32_t ns)
+{
+	return ((ns * 1000) + nemc->clk_period - 1) / nemc->clk_period;
+}
+
+static bool jz4780_nemc_configure_bank(struct jz4780_nemc *nemc,
+				       unsigned int bank,
+				       struct device_node *node)
+{
+	uint32_t smcr, val, cycles;
+
+	/*
+	 * Conversion of tBP and tAW cycle counts to values supported by the
+	 * hardware (round up to the next supported value).
+	 */
+	static const uint32_t convert_tBP_tAW[] = {
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
+
+		/* 11 - 12 -> 12 cycles */
+		11, 11,
+
+		/* 13 - 15 -> 15 cycles */
+		12, 12, 12,
+
+		/* 16 - 20 -> 20 cycles */
+		13, 13, 13, 13, 13,
+
+		/* 21 - 25 -> 25 cycles */
+		14, 14, 14, 14, 14,
+
+		/* 26 - 31 -> 31 cycles */
+		15, 15, 15, 15, 15, 15
+	};
+
+	smcr = readl(nemc->base + NEMC_SMCRn(bank));
+	smcr &= ~NEMC_SMCR_SMT;
+
+	if (!of_property_read_u32(node, "ingenic,nemc-bus-width", &val)) {
+		smcr &= ~NEMC_SMCR_BW_MASK;
+		switch (val) {
+		case 8:
+			smcr |= NEMC_SMCR_BW_8;
+			break;
+		default:
+			/*
+			 * Earlier SoCs support a 16 bit bus width (the 4780
+			 * does not), until those are properly supported, error.
+			 */
+			dev_err(nemc->dev, "unsupported bus width: %u\n", val);
+			return false;
+		}
+	}
+
+	if (of_property_read_u32(node, "ingenic,nemc-tAS", &val) == 0) {
+		smcr &= ~NEMC_SMCR_TAS_MASK;
+		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
+		if (cycles > 15) {
+			dev_err(nemc->dev, "tAS %u is too high (%u cycles)\n",
+				val, cycles);
+			return false;
+		}
+
+		smcr |= cycles << NEMC_SMCR_TAS_SHIFT;
+	}
+
+	if (of_property_read_u32(node, "ingenic,nemc-tAH", &val) == 0) {
+		smcr &= ~NEMC_SMCR_TAH_MASK;
+		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
+		if (cycles > 15) {
+			dev_err(nemc->dev, "tAH %u is too high (%u cycles)\n",
+				val, cycles);
+			return false;
+		}
+
+		smcr |= cycles << NEMC_SMCR_TAH_SHIFT;
+	}
+
+	if (of_property_read_u32(node, "ingenic,nemc-tBP", &val) == 0) {
+		smcr &= ~NEMC_SMCR_TBP_MASK;
+		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
+		if (cycles > 31) {
+			dev_err(nemc->dev, "tBP %u is too high (%u cycles)\n",
+				val, cycles);
+			return false;
+		}
+
+		smcr |= convert_tBP_tAW[cycles] << NEMC_SMCR_TBP_SHIFT;
+	}
+
+	if (of_property_read_u32(node, "ingenic,nemc-tAW", &val) == 0) {
+		smcr &= ~NEMC_SMCR_TAW_MASK;
+		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
+		if (cycles > 31) {
+			dev_err(nemc->dev, "tAW %u is too high (%u cycles)\n",
+				val, cycles);
+			return false;
+		}
+
+		smcr |= convert_tBP_tAW[cycles] << NEMC_SMCR_TAW_SHIFT;
+	}
+
+	if (of_property_read_u32(node, "ingenic,nemc-tSTRV", &val) == 0) {
+		smcr &= ~NEMC_SMCR_TSTRV_MASK;
+		cycles = jz4780_nemc_ns_to_cycles(nemc, val);
+		if (cycles > 63) {
+			dev_err(nemc->dev, "tSTRV %u is too high (%u cycles)\n",
+				val, cycles);
+			return false;
+		}
+
+		smcr |= cycles << NEMC_SMCR_TSTRV_SHIFT;
+	}
+
+	writel(smcr, nemc->base + NEMC_SMCRn(bank));
+	return true;
+}
+
+static int jz4780_nemc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct jz4780_nemc *nemc;
+	struct resource *res;
+	struct device_node *child;
+	const __be32 *prop;
+	unsigned int bank;
+	unsigned long referenced;
+	int i, ret;
+
+	nemc = devm_kzalloc(dev, sizeof(*nemc), GFP_KERNEL);
+	if (!nemc)
+		return -ENOMEM;
+
+	spin_lock_init(&nemc->lock);
+	nemc->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	nemc->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(nemc->base)) {
+		dev_err(dev, "failed to get I/O memory\n");
+		return PTR_ERR(nemc->base);
+	}
+
+	writel(0, nemc->base + NEMC_NFCSR);
+
+	nemc->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(nemc->clk)) {
+		dev_err(dev, "failed to get clock\n");
+		return PTR_ERR(nemc->clk);
+	}
+
+	ret = clk_prepare_enable(nemc->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable clock: %d\n", ret);
+		return ret;
+	}
+
+	nemc->clk_period = jz4780_nemc_clk_period(nemc);
+	if (!nemc->clk_period) {
+		dev_err(dev, "failed to calculate clock period\n");
+		clk_disable_unprepare(nemc->clk);
+		return -EINVAL;
+	}
+
+	/*
+	 * Iterate over child devices, check that they do not conflict with
+	 * each other, and register child devices for them. If a child device
+	 * has invalid properties, it is ignored and no platform device is
+	 * registered for it.
+	 */
+	for_each_child_of_node(nemc->dev->of_node, child) {
+		referenced = 0;
+		i = 0;
+		while ((prop = of_get_address(child, i++, NULL, NULL))) {
+			bank = of_read_number(prop, 1);
+			if (bank < 1 || bank >= JZ4780_NEMC_NUM_BANKS) {
+				dev_err(nemc->dev,
+					"%s requests invalid bank %u\n",
+					child->full_name, bank);
+
+				/* Will continue the outer loop below. */
+				referenced = 0;
+				break;
+			}
+
+			referenced |= BIT(bank);
+		}
+
+		if (!referenced) {
+			dev_err(nemc->dev, "%s has no addresses\n",
+				child->full_name);
+			continue;
+		} else if (nemc->banks_present & referenced) {
+			dev_err(nemc->dev, "%s conflicts with another node\n",
+				child->full_name);
+			continue;
+		}
+
+		/* Configure bank parameters. */
+		for_each_set_bit(bank, &referenced, JZ4780_NEMC_NUM_BANKS) {
+			if (!jz4780_nemc_configure_bank(nemc, bank, child)) {
+				referenced = 0;
+				break;
+			}
+		}
+
+		if (referenced) {
+			if (of_platform_device_create(child, NULL, nemc->dev))
+				nemc->banks_present |= referenced;
+		}
+	}
+
+	platform_set_drvdata(pdev, nemc);
+	dev_info(dev, "JZ4780 NEMC initialised\n");
+	return 0;
+}
+
+static int jz4780_nemc_remove(struct platform_device *pdev)
+{
+	struct jz4780_nemc *nemc = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(nemc->clk);
+	return 0;
+}
+
+static const struct of_device_id jz4780_nemc_dt_match[] = {
+	{ .compatible = "ingenic,jz4780-nemc" },
+	{},
+};
+
+static struct platform_driver jz4780_nemc_driver = {
+	.probe		= jz4780_nemc_probe,
+	.remove		= jz4780_nemc_remove,
+	.driver	= {
+		.name	= "jz4780-nemc",
+		.of_match_table = of_match_ptr(jz4780_nemc_dt_match),
+	},
+};
+
+static int __init jz4780_nemc_init(void)
+{
+	return platform_driver_register(&jz4780_nemc_driver);
+}
+subsys_initcall(jz4780_nemc_init);
diff --git a/drivers/misc/bh1780gli.c b/drivers/misc/bh1780gli.c
index 4c4a59b25537..7f90ce5a569a 100644
--- a/drivers/misc/bh1780gli.c
+++ b/drivers/misc/bh1780gli.c
@@ -230,6 +230,8 @@ static const struct i2c_device_id bh1780_id[] = {
 	{ },
 };
 
+MODULE_DEVICE_TABLE(i2c, bh1780_id);
+
 #ifdef CONFIG_OF
 static const struct of_device_id of_bh1780_match[] = {
 	{ .compatible = "rohm,bh1780gli", },
diff --git a/drivers/misc/carma/carma-fpga-program.c b/drivers/misc/carma/carma-fpga-program.c
index 06166ac000e0..0b1bd85e4ae6 100644
--- a/drivers/misc/carma/carma-fpga-program.c
+++ b/drivers/misc/carma/carma-fpga-program.c
@@ -479,6 +479,7 @@ static int fpga_program_block(struct fpga_dev *priv, void *buf, size_t count)
 static noinline int fpga_program_cpu(struct fpga_dev *priv)
 {
 	int ret;
+	unsigned long timeout;
 
 	/* Disable the programmer */
 	fpga_programmer_disable(priv);
@@ -497,8 +498,8 @@ static noinline int fpga_program_cpu(struct fpga_dev *priv)
 		goto out_disable_controller;
 
 	/* Wait for the interrupt handler to signal that programming finished */
-	ret = wait_for_completion_timeout(&priv->completion, 2 * HZ);
-	if (!ret) {
+	timeout = wait_for_completion_timeout(&priv->completion, 2 * HZ);
+	if (!timeout) {
 		dev_err(priv->dev, "Timed out waiting for completion\n");
 		ret = -ETIMEDOUT;
 		goto out_disable_controller;
@@ -536,6 +537,7 @@ static noinline int fpga_program_dma(struct fpga_dev *priv)
 	struct sg_table table;
 	dma_cookie_t cookie;
 	int ret, i;
+	unsigned long timeout;
 
 	/* Disable the programmer */
 	fpga_programmer_disable(priv);
@@ -623,8 +625,8 @@ static noinline int fpga_program_dma(struct fpga_dev *priv)
 	dev_dbg(priv->dev, "enabled the controller\n");
 
 	/* Wait for the interrupt handler to signal that programming finished */
-	ret = wait_for_completion_timeout(&priv->completion, 2 * HZ);
-	if (!ret) {
+	timeout = wait_for_completion_timeout(&priv->completion, 2 * HZ);
+	if (!timeout) {
 		dev_err(priv->dev, "Timed out waiting for completion\n");
 		ret = -ETIMEDOUT;
 		goto out_disable_controller;
@@ -1142,7 +1144,7 @@ out_return:
 	return ret;
 }
 
-static struct of_device_id fpga_of_match[] = {
+static const struct of_device_id fpga_of_match[] = {
 	{ .compatible = "carma,fpga-programmer", },
 	{},
 };
diff --git a/drivers/misc/carma/carma-fpga.c b/drivers/misc/carma/carma-fpga.c
index 68cdfe151bdb..5aba3fd789de 100644
--- a/drivers/misc/carma/carma-fpga.c
+++ b/drivers/misc/carma/carma-fpga.c
@@ -1486,7 +1486,7 @@ static int data_of_remove(struct platform_device *op)
 	return 0;
 }
 
-static struct of_device_id data_of_match[] = {
+static const struct of_device_id data_of_match[] = {
 	{ .compatible = "carma,carma-fpga", },
 	{},
 };
diff --git a/drivers/misc/lis3lv02d/lis3lv02d.c b/drivers/misc/lis3lv02d/lis3lv02d.c
index 3ef4627f9cb1..4739689d23ad 100644
--- a/drivers/misc/lis3lv02d/lis3lv02d.c
+++ b/drivers/misc/lis3lv02d/lis3lv02d.c
@@ -950,6 +950,7 @@ int lis3lv02d_init_dt(struct lis3lv02d *lis3)
 	struct lis3lv02d_platform_data *pdata;
 	struct device_node *np = lis3->of_node;
 	u32 val;
+	s32 sval;
 
 	if (!lis3->of_node)
 		return 0;
@@ -1031,6 +1032,23 @@ int lis3lv02d_init_dt(struct lis3lv02d *lis3)
 		pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
 	if (of_get_property(np, "st,wakeup-z-hi", NULL))
 		pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
+	if (of_get_property(np, "st,wakeup-threshold", &val))
+		pdata->wakeup_thresh = val;
+
+	if (of_get_property(np, "st,wakeup2-x-lo", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
+	if (of_get_property(np, "st,wakeup2-x-hi", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
+	if (of_get_property(np, "st,wakeup2-y-lo", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
+	if (of_get_property(np, "st,wakeup2-y-hi", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
+	if (of_get_property(np, "st,wakeup2-z-lo", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
+	if (of_get_property(np, "st,wakeup2-z-hi", NULL))
+		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
+	if (of_get_property(np, "st,wakeup2-threshold", &val))
+		pdata->wakeup_thresh2 = val;
 
 	if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
 		switch (val) {
@@ -1054,29 +1072,29 @@ int lis3lv02d_init_dt(struct lis3lv02d *lis3)
 	if (of_get_property(np, "st,hipass2-disable", NULL))
 		pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
 
-	if (of_get_property(np, "st,axis-x", &val))
-		pdata->axis_x = val;
-	if (of_get_property(np, "st,axis-y", &val))
-		pdata->axis_y = val;
-	if (of_get_property(np, "st,axis-z", &val))
-		pdata->axis_z = val;
+	if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
+		pdata->axis_x = sval;
+	if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
+		pdata->axis_y = sval;
+	if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
+		pdata->axis_z = sval;
 
 	if (of_get_property(np, "st,default-rate", NULL))
 		pdata->default_rate = val;
 
-	if (of_get_property(np, "st,min-limit-x", &val))
-		pdata->st_min_limits[0] = val;
-	if (of_get_property(np, "st,min-limit-y", &val))
-		pdata->st_min_limits[1] = val;
-	if (of_get_property(np, "st,min-limit-z", &val))
-		pdata->st_min_limits[2] = val;
-
-	if (of_get_property(np, "st,max-limit-x", &val))
-		pdata->st_max_limits[0] = val;
-	if (of_get_property(np, "st,max-limit-y", &val))
-		pdata->st_max_limits[1] = val;
-	if (of_get_property(np, "st,max-limit-z", &val))
-		pdata->st_max_limits[2] = val;
+	if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
+		pdata->st_min_limits[0] = sval;
+	if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
+		pdata->st_min_limits[1] = sval;
+	if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
+		pdata->st_min_limits[2] = sval;
+
+	if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
+		pdata->st_max_limits[0] = sval;
+	if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
+		pdata->st_max_limits[1] = sval;
+	if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
+		pdata->st_max_limits[2] = sval;
 
 
 	lis3->pdata = pdata;
diff --git a/drivers/misc/lis3lv02d/lis3lv02d_i2c.c b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
index 63fe096d4462..e3e7f1dc27ba 100644
--- a/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
+++ b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
@@ -106,7 +106,7 @@ static union axis_conversion lis3lv02d_axis_map =
 	{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
 
 #ifdef CONFIG_OF
-static struct of_device_id lis3lv02d_i2c_dt_ids[] = {
+static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
 	{ .compatible = "st,lis3lv02d" },
 	{}
 };
diff --git a/drivers/misc/lis3lv02d/lis3lv02d_spi.c b/drivers/misc/lis3lv02d/lis3lv02d_spi.c
index bd06d0cfac45..b2f6e1651ac9 100644
--- a/drivers/misc/lis3lv02d/lis3lv02d_spi.c
+++ b/drivers/misc/lis3lv02d/lis3lv02d_spi.c
@@ -61,7 +61,7 @@ static union axis_conversion lis3lv02d_axis_normal =
 	{ .as_array = { 1, 2, 3 } };
 
 #ifdef CONFIG_OF
-static struct of_device_id lis302dl_spi_dt_ids[] = {
+static const struct of_device_id lis302dl_spi_dt_ids[] = {
 	{ .compatible = "st,lis302dl-spi" },
 	{}
 };
diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index 8ebc6cda1373..518914a82b83 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -21,3 +21,6 @@ mei-me-objs += hw-me.o
 obj-$(CONFIG_INTEL_MEI_TXE) += mei-txe.o
 mei-txe-objs := pci-txe.o
 mei-txe-objs += hw-txe.o
+
+mei-$(CONFIG_EVENT_TRACING) += mei-trace.o
+CFLAGS_mei-trace.o = -I$(src)
diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index 40ea639fa413..d2cd53e3fac3 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -48,10 +48,7 @@ void mei_amthif_reset_params(struct mei_device *dev)
 {
 	/* reset iamthif parameters. */
 	dev->iamthif_current_cb = NULL;
-	dev->iamthif_msg_buf_size = 0;
-	dev->iamthif_msg_buf_index = 0;
 	dev->iamthif_canceled = false;
-	dev->iamthif_ioctl = false;
 	dev->iamthif_state = MEI_IAMTHIF_IDLE;
 	dev->iamthif_timer = 0;
 	dev->iamthif_stall_timer = 0;
@@ -69,7 +66,6 @@ int mei_amthif_host_init(struct mei_device *dev)
 {
 	struct mei_cl *cl = &dev->iamthif_cl;
 	struct mei_me_client *me_cl;
-	unsigned char *msg_buf;
 	int ret;
 
 	dev->iamthif_state = MEI_IAMTHIF_IDLE;
@@ -90,18 +86,6 @@ int mei_amthif_host_init(struct mei_device *dev)
 	dev->iamthif_mtu = me_cl->props.max_msg_length;
 	dev_dbg(dev->dev, "IAMTHIF_MTU = %d\n", dev->iamthif_mtu);
 
-	kfree(dev->iamthif_msg_buf);
-	dev->iamthif_msg_buf = NULL;
-
-	/* allocate storage for ME message buffer */
-	msg_buf = kcalloc(dev->iamthif_mtu,
-			sizeof(unsigned char), GFP_KERNEL);
-	if (!msg_buf) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	dev->iamthif_msg_buf = msg_buf;
 
 	ret = mei_cl_link(cl, MEI_IAMTHIF_HOST_CLIENT_ID);
 	if (ret < 0) {
@@ -194,30 +178,33 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 		dev_dbg(dev->dev, "woke up from sleep\n");
 	}
 
+	if (cb->status) {
+		rets = cb->status;
+		dev_dbg(dev->dev, "read operation failed %d\n", rets);
+		goto free;
+	}
 
 	dev_dbg(dev->dev, "Got amthif data\n");
 	dev->iamthif_timer = 0;
 
-	if (cb) {
-		timeout = cb->read_time +
-			mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
-		dev_dbg(dev->dev, "amthif timeout = %lud\n",
-				timeout);
-
-		if  (time_after(jiffies, timeout)) {
-			dev_dbg(dev->dev, "amthif Time out\n");
-			/* 15 sec for the message has expired */
-			list_del(&cb->list);
-			rets = -ETIME;
-			goto free;
-		}
+	timeout = cb->read_time +
+		mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
+	dev_dbg(dev->dev, "amthif timeout = %lud\n",
+			timeout);
+
+	if  (time_after(jiffies, timeout)) {
+		dev_dbg(dev->dev, "amthif Time out\n");
+		/* 15 sec for the message has expired */
+		list_del_init(&cb->list);
+		rets = -ETIME;
+		goto free;
 	}
 	/* if the whole message will fit remove it from the list */
 	if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
-		list_del(&cb->list);
+		list_del_init(&cb->list);
 	else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
 		/* end of the message has been reached */
-		list_del(&cb->list);
+		list_del_init(&cb->list);
 		rets = 0;
 		goto free;
 	}
@@ -225,15 +212,15 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 		 * remove message from deletion list
 		 */
 
-	dev_dbg(dev->dev, "amthif cb->response_buffer size - %d\n",
-	    cb->response_buffer.size);
+	dev_dbg(dev->dev, "amthif cb->buf size - %d\n",
+	    cb->buf.size);
 	dev_dbg(dev->dev, "amthif cb->buf_idx - %lu\n", cb->buf_idx);
 
 	/* length is being truncated to PAGE_SIZE, however,
 	 * the buf_idx may point beyond */
 	length = min_t(size_t, length, (cb->buf_idx - *offset));
 
-	if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
+	if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
 		dev_dbg(dev->dev, "failed to copy data to userland\n");
 		rets = -EFAULT;
 	} else {
@@ -252,126 +239,88 @@ out:
 }
 
 /**
- * mei_amthif_send_cmd - send amthif command to the ME
+ * mei_amthif_read_start - queue message for sending read credential
  *
- * @dev: the device structure
- * @cb: mei call back struct
+ * @cl: host client
+ * @file: file pointer of message recipient
  *
  * Return: 0 on success, <0 on failure.
- *
  */
-static int mei_amthif_send_cmd(struct mei_device *dev, struct mei_cl_cb *cb)
+static int mei_amthif_read_start(struct mei_cl *cl, struct file *file)
 {
-	struct mei_msg_hdr mei_hdr;
-	struct mei_cl *cl;
-	int ret;
-
-	if (!dev || !cb)
-		return -ENODEV;
+	struct mei_device *dev = cl->dev;
+	struct mei_cl_cb *cb;
+	size_t length = dev->iamthif_mtu;
+	int rets;
 
-	dev_dbg(dev->dev, "write data to amthif client.\n");
+	cb = mei_io_cb_init(cl, MEI_FOP_READ, file);
+	if (!cb) {
+		rets = -ENOMEM;
+		goto err;
+	}
 
-	dev->iamthif_state = MEI_IAMTHIF_WRITING;
-	dev->iamthif_current_cb = cb;
-	dev->iamthif_file_object = cb->file_object;
-	dev->iamthif_canceled = false;
-	dev->iamthif_ioctl = true;
-	dev->iamthif_msg_buf_size = cb->request_buffer.size;
-	memcpy(dev->iamthif_msg_buf, cb->request_buffer.data,
-	       cb->request_buffer.size);
-	cl = &dev->iamthif_cl;
+	rets = mei_io_cb_alloc_buf(cb, length);
+	if (rets)
+		goto err;
 
-	ret = mei_cl_flow_ctrl_creds(cl);
-	if (ret < 0)
-		return ret;
+	list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 
-	if (ret && mei_hbuf_acquire(dev)) {
-		ret = 0;
-		if (cb->request_buffer.size > mei_hbuf_max_len(dev)) {
-			mei_hdr.length = mei_hbuf_max_len(dev);
-			mei_hdr.msg_complete = 0;
-		} else {
-			mei_hdr.length = cb->request_buffer.size;
-			mei_hdr.msg_complete = 1;
-		}
+	dev->iamthif_state = MEI_IAMTHIF_READING;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_current_cb = cb;
 
-		mei_hdr.host_addr = cl->host_client_id;
-		mei_hdr.me_addr = cl->me_client_id;
-		mei_hdr.reserved = 0;
-		mei_hdr.internal = 0;
-		dev->iamthif_msg_buf_index += mei_hdr.length;
-		ret = mei_write_message(dev, &mei_hdr, dev->iamthif_msg_buf);
-		if (ret)
-			return ret;
-
-		if (mei_hdr.msg_complete) {
-			if (mei_cl_flow_ctrl_reduce(cl))
-				return -EIO;
-			dev->iamthif_flow_control_pending = true;
-			dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
-			dev_dbg(dev->dev, "add amthif cb to write waiting list\n");
-			dev->iamthif_current_cb = cb;
-			dev->iamthif_file_object = cb->file_object;
-			list_add_tail(&cb->list, &dev->write_waiting_list.list);
-		} else {
-			dev_dbg(dev->dev, "message does not complete, so add amthif cb to write list.\n");
-			list_add_tail(&cb->list, &dev->write_list.list);
-		}
-	} else {
-		list_add_tail(&cb->list, &dev->write_list.list);
-	}
 	return 0;
+err:
+	mei_io_cb_free(cb);
+	return rets;
 }
 
 /**
- * mei_amthif_write - write amthif data to amthif client
+ * mei_amthif_send_cmd - send amthif command to the ME
  *
- * @dev: the device structure
+ * @cl: the host client
  * @cb: mei call back struct
  *
  * Return: 0 on success, <0 on failure.
- *
  */
-int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *cb)
+static int mei_amthif_send_cmd(struct mei_cl *cl, struct mei_cl_cb *cb)
 {
+	struct mei_device *dev;
 	int ret;
 
-	if (!dev || !cb)
+	if (!cl->dev || !cb)
 		return -ENODEV;
 
-	ret = mei_io_cb_alloc_resp_buf(cb, dev->iamthif_mtu);
-	if (ret)
+	dev = cl->dev;
+
+	dev->iamthif_state = MEI_IAMTHIF_WRITING;
+	dev->iamthif_current_cb = cb;
+	dev->iamthif_file_object = cb->file_object;
+	dev->iamthif_canceled = false;
+
+	ret = mei_cl_write(cl, cb, false);
+	if (ret < 0)
 		return ret;
 
-	cb->fop_type = MEI_FOP_WRITE;
+	if (cb->completed)
+		cb->status = mei_amthif_read_start(cl, cb->file_object);
 
-	if (!list_empty(&dev->amthif_cmd_list.list) ||
-	    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
-		dev_dbg(dev->dev,
-			"amthif state = %d\n", dev->iamthif_state);
-		dev_dbg(dev->dev, "AMTHIF: add cb to the wait list\n");
-		list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
-		return 0;
-	}
-	return mei_amthif_send_cmd(dev, cb);
+	return 0;
 }
+
 /**
  * mei_amthif_run_next_cmd - send next amt command from queue
  *
  * @dev: the device structure
+ *
+ * Return: 0 on success, <0 on failure.
  */
-void mei_amthif_run_next_cmd(struct mei_device *dev)
+int mei_amthif_run_next_cmd(struct mei_device *dev)
 {
+	struct mei_cl *cl = &dev->iamthif_cl;
 	struct mei_cl_cb *cb;
-	int ret;
-
-	if (!dev)
-		return;
 
-	dev->iamthif_msg_buf_size = 0;
-	dev->iamthif_msg_buf_index = 0;
 	dev->iamthif_canceled = false;
-	dev->iamthif_ioctl = true;
 	dev->iamthif_state = MEI_IAMTHIF_IDLE;
 	dev->iamthif_timer = 0;
 	dev->iamthif_file_object = NULL;
@@ -381,13 +330,48 @@ void mei_amthif_run_next_cmd(struct mei_device *dev)
 	cb = list_first_entry_or_null(&dev->amthif_cmd_list.list,
 					typeof(*cb), list);
 	if (!cb)
-		return;
-	list_del(&cb->list);
-	ret =  mei_amthif_send_cmd(dev, cb);
-	if (ret)
-		dev_warn(dev->dev, "amthif write failed status = %d\n", ret);
+		return 0;
+
+	list_del_init(&cb->list);
+	return mei_amthif_send_cmd(cl, cb);
 }
 
+/**
+ * mei_amthif_write - write amthif data to amthif client
+ *
+ * @cl: host client
+ * @cb: mei call back struct
+ *
+ * Return: 0 on success, <0 on failure.
+ */
+int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
+{
+
+	struct mei_device *dev;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	if (WARN_ON(!cb))
+		return -EINVAL;
+
+	dev = cl->dev;
+
+	list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
+	return mei_amthif_run_next_cmd(dev);
+}
+
+/**
+ * mei_amthif_poll - the amthif poll function
+ *
+ * @dev: the device structure
+ * @file: pointer to file structure
+ * @wait: pointer to poll_table structure
+ *
+ * Return: poll mask
+ *
+ * Locking: called under "dev->device_lock" lock
+ */
 
 unsigned int mei_amthif_poll(struct mei_device *dev,
 		struct file *file, poll_table *wait)
@@ -396,19 +380,12 @@ unsigned int mei_amthif_poll(struct mei_device *dev,
 
 	poll_wait(file, &dev->iamthif_cl.wait, wait);
 
-	mutex_lock(&dev->device_lock);
-	if (!mei_cl_is_connected(&dev->iamthif_cl)) {
-
-		mask = POLLERR;
-
-	} else if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
-		   dev->iamthif_file_object == file) {
+	if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
+	    dev->iamthif_file_object == file) {
 
-		mask |= (POLLIN | POLLRDNORM);
-		dev_dbg(dev->dev, "run next amthif cb\n");
+		mask |= POLLIN | POLLRDNORM;
 		mei_amthif_run_next_cmd(dev);
 	}
-	mutex_unlock(&dev->device_lock);
 
 	return mask;
 }
@@ -427,71 +404,14 @@ unsigned int mei_amthif_poll(struct mei_device *dev,
 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 			 struct mei_cl_cb *cmpl_list)
 {
-	struct mei_device *dev = cl->dev;
-	struct mei_msg_hdr mei_hdr;
-	size_t len = dev->iamthif_msg_buf_size - dev->iamthif_msg_buf_index;
-	u32 msg_slots = mei_data2slots(len);
-	int slots;
-	int rets;
-
-	rets = mei_cl_flow_ctrl_creds(cl);
-	if (rets < 0)
-		return rets;
-
-	if (rets == 0) {
-		cl_dbg(dev, cl, "No flow control credentials: not sending.\n");
-		return 0;
-	}
-
-	mei_hdr.host_addr = cl->host_client_id;
-	mei_hdr.me_addr = cl->me_client_id;
-	mei_hdr.reserved = 0;
-	mei_hdr.internal = 0;
-
-	slots = mei_hbuf_empty_slots(dev);
-
-	if (slots >= msg_slots) {
-		mei_hdr.length = len;
-		mei_hdr.msg_complete = 1;
-	/* Split the message only if we can write the whole host buffer */
-	} else if (slots == dev->hbuf_depth) {
-		msg_slots = slots;
-		len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
-		mei_hdr.length = len;
-		mei_hdr.msg_complete = 0;
-	} else {
-		/* wait for next time the host buffer is empty */
-		return 0;
-	}
-
-	dev_dbg(dev->dev, MEI_HDR_FMT,  MEI_HDR_PRM(&mei_hdr));
-
-	rets = mei_write_message(dev, &mei_hdr,
-			dev->iamthif_msg_buf + dev->iamthif_msg_buf_index);
-	if (rets) {
-		dev->iamthif_state = MEI_IAMTHIF_IDLE;
-		cl->status = rets;
-		list_del(&cb->list);
-		return rets;
-	}
-
-	if (mei_cl_flow_ctrl_reduce(cl))
-		return -EIO;
-
-	dev->iamthif_msg_buf_index += mei_hdr.length;
-	cl->status = 0;
-
-	if (mei_hdr.msg_complete) {
-		dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
-		dev->iamthif_flow_control_pending = true;
-
-		/* save iamthif cb sent to amthif client */
-		cb->buf_idx = dev->iamthif_msg_buf_index;
-		dev->iamthif_current_cb = cb;
+	int ret;
 
-		list_move_tail(&cb->list, &dev->write_waiting_list.list);
-	}
+	ret = mei_cl_irq_write(cl, cb, cmpl_list);
+	if (ret)
+		return ret;
 
+	if (cb->completed)
+		cb->status = mei_amthif_read_start(cl, cb->file_object);
 
 	return 0;
 }
@@ -500,83 +420,35 @@ int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
  * mei_amthif_irq_read_msg - read routine after ISR to
  *			handle the read amthif message
  *
- * @dev: the device structure
+ * @cl: mei client
  * @mei_hdr: header of amthif message
- * @complete_list: An instance of our list structure
+ * @cmpl_list: completed callbacks list
  *
- * Return: 0 on success, <0 on failure.
+ * Return: -ENODEV if cb is NULL 0 otherwise; error message is in cb->status
  */
-int mei_amthif_irq_read_msg(struct mei_device *dev,
+int mei_amthif_irq_read_msg(struct mei_cl *cl,
 			    struct mei_msg_hdr *mei_hdr,
-			    struct mei_cl_cb *complete_list)
+			    struct mei_cl_cb *cmpl_list)
 {
-	struct mei_cl_cb *cb;
-	unsigned char *buffer;
-
-	BUG_ON(mei_hdr->me_addr != dev->iamthif_cl.me_client_id);
-	BUG_ON(dev->iamthif_state != MEI_IAMTHIF_READING);
+	struct mei_device *dev;
+	int ret;
 
-	buffer = dev->iamthif_msg_buf + dev->iamthif_msg_buf_index;
-	BUG_ON(dev->iamthif_mtu < dev->iamthif_msg_buf_index + mei_hdr->length);
+	dev = cl->dev;
 
-	mei_read_slots(dev, buffer, mei_hdr->length);
+	if (dev->iamthif_state != MEI_IAMTHIF_READING)
+		return 0;
 
-	dev->iamthif_msg_buf_index += mei_hdr->length;
+	ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
+	if (ret)
+		return ret;
 
 	if (!mei_hdr->msg_complete)
 		return 0;
 
-	dev_dbg(dev->dev, "amthif_message_buffer_index =%d\n",
-			mei_hdr->length);
-
 	dev_dbg(dev->dev, "completed amthif read.\n ");
-	if (!dev->iamthif_current_cb)
-		return -ENODEV;
-
-	cb = dev->iamthif_current_cb;
 	dev->iamthif_current_cb = NULL;
-
 	dev->iamthif_stall_timer = 0;
-	cb->buf_idx = dev->iamthif_msg_buf_index;
-	cb->read_time = jiffies;
-	if (dev->iamthif_ioctl) {
-		/* found the iamthif cb */
-		dev_dbg(dev->dev, "complete the amthif read cb.\n ");
-		dev_dbg(dev->dev, "add the amthif read cb to complete.\n ");
-		list_add_tail(&cb->list, &complete_list->list);
-	}
-	return 0;
-}
-
-/**
- * mei_amthif_irq_read - prepares to read amthif data.
- *
- * @dev: the device structure.
- * @slots: free slots.
- *
- * Return: 0, OK; otherwise, error.
- */
-int mei_amthif_irq_read(struct mei_device *dev, s32 *slots)
-{
-	u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
-
-	if (*slots < msg_slots)
-		return -EMSGSIZE;
-
-	*slots -= msg_slots;
-
-	if (mei_hbm_cl_flow_control_req(dev, &dev->iamthif_cl)) {
-		dev_dbg(dev->dev, "iamthif flow control failed\n");
-		return -EIO;
-	}
 
-	dev_dbg(dev->dev, "iamthif flow control success\n");
-	dev->iamthif_state = MEI_IAMTHIF_READING;
-	dev->iamthif_flow_control_pending = false;
-	dev->iamthif_msg_buf_index = 0;
-	dev->iamthif_msg_buf_size = 0;
-	dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
-	dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
 	return 0;
 }
 
@@ -588,17 +460,30 @@ int mei_amthif_irq_read(struct mei_device *dev, s32 *slots)
  */
 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
 {
+
+	if (cb->fop_type == MEI_FOP_WRITE) {
+		if (!cb->status) {
+			dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
+			mei_io_cb_free(cb);
+			return;
+		}
+		/*
+		 * in case of error enqueue the write cb to complete read list
+		 * so it can be propagated to the reader
+		 */
+		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
+		wake_up_interruptible(&dev->iamthif_cl.wait);
+		return;
+	}
+
 	if (dev->iamthif_canceled != 1) {
 		dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
 		dev->iamthif_stall_timer = 0;
-		memcpy(cb->response_buffer.data,
-				dev->iamthif_msg_buf,
-				dev->iamthif_msg_buf_index);
 		list_add_tail(&cb->list, &dev->amthif_rd_complete_list.list);
 		dev_dbg(dev->dev, "amthif read completed\n");
 		dev->iamthif_timer = jiffies;
 		dev_dbg(dev->dev, "dev->iamthif_timer = %ld\n",
-				dev->iamthif_timer);
+			dev->iamthif_timer);
 	} else {
 		mei_amthif_run_next_cmd(dev);
 	}
@@ -623,26 +508,22 @@ void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb)
 static bool mei_clear_list(struct mei_device *dev,
 		const struct file *file, struct list_head *mei_cb_list)
 {
-	struct mei_cl_cb *cb_pos = NULL;
-	struct mei_cl_cb *cb_next = NULL;
+	struct mei_cl *cl = &dev->iamthif_cl;
+	struct mei_cl_cb *cb, *next;
 	bool removed = false;
 
 	/* list all list member */
-	list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, list) {
+	list_for_each_entry_safe(cb, next, mei_cb_list, list) {
 		/* check if list member associated with a file */
-		if (file == cb_pos->file_object) {
-			/* remove member from the list */
-			list_del(&cb_pos->list);
+		if (file == cb->file_object) {
 			/* check if cb equal to current iamthif cb */
-			if (dev->iamthif_current_cb == cb_pos) {
+			if (dev->iamthif_current_cb == cb) {
 				dev->iamthif_current_cb = NULL;
 				/* send flow control to iamthif client */
-				mei_hbm_cl_flow_control_req(dev,
-							&dev->iamthif_cl);
+				mei_hbm_cl_flow_control_req(dev, cl);
 			}
 			/* free all allocated buffers */
-			mei_io_cb_free(cb_pos);
-			cb_pos = NULL;
+			mei_io_cb_free(cb);
 			removed = true;
 		}
 	}
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index be767f4db26a..4cf38c39878a 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -238,7 +238,7 @@ static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 	dev = cl->dev;
 
 	mutex_lock(&dev->device_lock);
-	if (cl->state != MEI_FILE_CONNECTED) {
+	if (!mei_cl_is_connected(cl)) {
 		rets = -ENODEV;
 		goto out;
 	}
@@ -255,17 +255,13 @@ static ssize_t ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 		goto out;
 	}
 
-	cb = mei_io_cb_init(cl, NULL);
+	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
 	if (!cb) {
 		rets = -ENOMEM;
 		goto out;
 	}
 
-	rets = mei_io_cb_alloc_req_buf(cb, length);
-	if (rets < 0)
-		goto out;
-
-	memcpy(cb->request_buffer.data, buf, length);
+	memcpy(cb->buf.data, buf, length);
 
 	rets = mei_cl_write(cl, cb, blocking);
 
@@ -292,20 +288,21 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
 
 	mutex_lock(&dev->device_lock);
 
-	if (!cl->read_cb) {
-		rets = mei_cl_read_start(cl, length);
-		if (rets < 0)
-			goto out;
-	}
+	cb = mei_cl_read_cb(cl, NULL);
+	if (cb)
+		goto copy;
 
-	if (cl->reading_state != MEI_READ_COMPLETE &&
-	    !waitqueue_active(&cl->rx_wait)) {
+	rets = mei_cl_read_start(cl, length, NULL);
+	if (rets && rets != -EBUSY)
+		goto out;
+
+	if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
 
 		mutex_unlock(&dev->device_lock);
 
 		if (wait_event_interruptible(cl->rx_wait,
-				cl->reading_state == MEI_READ_COMPLETE  ||
-				mei_cl_is_transitioning(cl))) {
+				(!list_empty(&cl->rd_completed)) ||
+				(!mei_cl_is_connected(cl)))) {
 
 			if (signal_pending(current))
 				return -EINTR;
@@ -313,23 +310,31 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length)
 		}
 
 		mutex_lock(&dev->device_lock);
-	}
 
-	cb = cl->read_cb;
+		if (!mei_cl_is_connected(cl)) {
+			rets = -EBUSY;
+			goto out;
+		}
+	}
 
-	if (cl->reading_state != MEI_READ_COMPLETE) {
+	cb = mei_cl_read_cb(cl, NULL);
+	if (!cb) {
 		rets = 0;
 		goto out;
 	}
 
+copy:
+	if (cb->status) {
+		rets = cb->status;
+		goto free;
+	}
+
 	r_length = min_t(size_t, length, cb->buf_idx);
-	memcpy(buf, cb->response_buffer.data, r_length);
+	memcpy(buf, cb->buf.data, r_length);
 	rets = r_length;
 
+free:
 	mei_io_cb_free(cb);
-	cl->reading_state = MEI_IDLE;
-	cl->read_cb = NULL;
-
 out:
 	mutex_unlock(&dev->device_lock);
 
@@ -386,7 +391,7 @@ static void mei_bus_event_work(struct work_struct *work)
 	device->events = 0;
 
 	/* Prepare for the next read */
-	mei_cl_read_start(device->cl, 0);
+	mei_cl_read_start(device->cl, 0, NULL);
 }
 
 int mei_cl_register_event_cb(struct mei_cl_device *device,
@@ -400,7 +405,7 @@ int mei_cl_register_event_cb(struct mei_cl_device *device,
 	device->event_context = context;
 	INIT_WORK(&device->event_work, mei_bus_event_work);
 
-	mei_cl_read_start(device->cl, 0);
+	mei_cl_read_start(device->cl, 0, NULL);
 
 	return 0;
 }
@@ -441,8 +446,8 @@ int mei_cl_enable_device(struct mei_cl_device *device)
 
 	mutex_unlock(&dev->device_lock);
 
-	if (device->event_cb && !cl->read_cb)
-		mei_cl_read_start(device->cl, 0);
+	if (device->event_cb)
+		mei_cl_read_start(device->cl, 0, NULL);
 
 	if (!device->ops || !device->ops->enable)
 		return 0;
@@ -462,54 +467,34 @@ int mei_cl_disable_device(struct mei_cl_device *device)
 
 	dev = cl->dev;
 
+	if (device->ops && device->ops->disable)
+		device->ops->disable(device);
+
+	device->event_cb = NULL;
+
 	mutex_lock(&dev->device_lock);
 
-	if (cl->state != MEI_FILE_CONNECTED) {
-		mutex_unlock(&dev->device_lock);
+	if (!mei_cl_is_connected(cl)) {
 		dev_err(dev->dev, "Already disconnected");
-
-		return 0;
+		err = 0;
+		goto out;
 	}
 
 	cl->state = MEI_FILE_DISCONNECTING;
 
 	err = mei_cl_disconnect(cl);
 	if (err < 0) {
-		mutex_unlock(&dev->device_lock);
-		dev_err(dev->dev,
-			"Could not disconnect from the ME client");
-
-		return err;
+		dev_err(dev->dev, "Could not disconnect from the ME client");
+		goto out;
 	}
 
 	/* Flush queues and remove any pending read */
-	mei_cl_flush_queues(cl);
-
-	if (cl->read_cb) {
-		struct mei_cl_cb *cb = NULL;
-
-		cb = mei_cl_find_read_cb(cl);
-		/* Remove entry from read list */
-		if (cb)
-			list_del(&cb->list);
-
-		cb = cl->read_cb;
-		cl->read_cb = NULL;
-
-		if (cb) {
-			mei_io_cb_free(cb);
-			cb = NULL;
-		}
-	}
-
-	device->event_cb = NULL;
+	mei_cl_flush_queues(cl, NULL);
 
+out:
 	mutex_unlock(&dev->device_lock);
+	return err;
 
-	if (!device->ops || !device->ops->disable)
-		return 0;
-
-	return device->ops->disable(device);
 }
 EXPORT_SYMBOL_GPL(mei_cl_disable_device);
 
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index dfbddfe1c7a0..1e99ef6a54a2 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -48,14 +48,14 @@ void mei_me_cl_init(struct mei_me_client *me_cl)
  */
 struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl)
 {
-	if (me_cl)
-		kref_get(&me_cl->refcnt);
+	if (me_cl && kref_get_unless_zero(&me_cl->refcnt))
+		return me_cl;
 
-	return me_cl;
+	return NULL;
 }
 
 /**
- * mei_me_cl_release - unlink and free me client
+ * mei_me_cl_release - free me client
  *
  * Locking: called under "dev->device_lock" lock
  *
@@ -65,9 +65,10 @@ static void mei_me_cl_release(struct kref *ref)
 {
 	struct mei_me_client *me_cl =
 		container_of(ref, struct mei_me_client, refcnt);
-	list_del(&me_cl->list);
+
 	kfree(me_cl);
 }
+
 /**
  * mei_me_cl_put - decrease me client refcount and free client if necessary
  *
@@ -82,51 +83,146 @@ void mei_me_cl_put(struct mei_me_client *me_cl)
 }
 
 /**
- * mei_me_cl_by_uuid - locate me client by uuid
+ * __mei_me_cl_del  - delete me client form the list and decrease
+ *     reference counter
+ *
+ * @dev: mei device
+ * @me_cl: me client
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
+{
+	if (!me_cl)
+		return;
+
+	list_del(&me_cl->list);
+	mei_me_cl_put(me_cl);
+}
+
+/**
+ * mei_me_cl_add - add me client to the list
+ *
+ * @dev: mei device
+ * @me_cl: me client
+ */
+void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl)
+{
+	down_write(&dev->me_clients_rwsem);
+	list_add(&me_cl->list, &dev->me_clients);
+	up_write(&dev->me_clients_rwsem);
+}
+
+/**
+ * __mei_me_cl_by_uuid - locate me client by uuid
  *	increases ref count
  *
  * @dev: mei device
  * @uuid: me client uuid
  *
- * Locking: called under "dev->device_lock" lock
- *
  * Return: me client or NULL if not found
+ *
+ * Locking: dev->me_clients_rwsem
  */
-struct mei_me_client *mei_me_cl_by_uuid(const struct mei_device *dev,
+static struct mei_me_client *__mei_me_cl_by_uuid(struct mei_device *dev,
 					const uuid_le *uuid)
 {
 	struct mei_me_client *me_cl;
+	const uuid_le *pn;
 
-	list_for_each_entry(me_cl, &dev->me_clients, list)
-		if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0)
+	WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
+
+	list_for_each_entry(me_cl, &dev->me_clients, list) {
+		pn = &me_cl->props.protocol_name;
+		if (uuid_le_cmp(*uuid, *pn) == 0)
 			return mei_me_cl_get(me_cl);
+	}
 
 	return NULL;
 }
 
 /**
+ * mei_me_cl_by_uuid - locate me client by uuid
+ *	increases ref count
+ *
+ * @dev: mei device
+ * @uuid: me client uuid
+ *
+ * Return: me client or NULL if not found
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
+					const uuid_le *uuid)
+{
+	struct mei_me_client *me_cl;
+
+	down_read(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid(dev, uuid);
+	up_read(&dev->me_clients_rwsem);
+
+	return me_cl;
+}
+
+/**
  * mei_me_cl_by_id - locate me client by client id
  *	increases ref count
  *
  * @dev: the device structure
  * @client_id: me client id
  *
- * Locking: called under "dev->device_lock" lock
- *
  * Return: me client or NULL if not found
+ *
+ * Locking: dev->me_clients_rwsem
  */
 struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
 {
 
+	struct mei_me_client *__me_cl, *me_cl = NULL;
+
+	down_read(&dev->me_clients_rwsem);
+	list_for_each_entry(__me_cl, &dev->me_clients, list) {
+		if (__me_cl->client_id == client_id) {
+			me_cl = mei_me_cl_get(__me_cl);
+			break;
+		}
+	}
+	up_read(&dev->me_clients_rwsem);
+
+	return me_cl;
+}
+
+/**
+ * __mei_me_cl_by_uuid_id - locate me client by client id and uuid
+ *	increases ref count
+ *
+ * @dev: the device structure
+ * @uuid: me client uuid
+ * @client_id: me client id
+ *
+ * Return: me client or null if not found
+ *
+ * Locking: dev->me_clients_rwsem
+ */
+static struct mei_me_client *__mei_me_cl_by_uuid_id(struct mei_device *dev,
+					   const uuid_le *uuid, u8 client_id)
+{
 	struct mei_me_client *me_cl;
+	const uuid_le *pn;
+
+	WARN_ON(!rwsem_is_locked(&dev->me_clients_rwsem));
 
-	list_for_each_entry(me_cl, &dev->me_clients, list)
-		if (me_cl->client_id == client_id)
+	list_for_each_entry(me_cl, &dev->me_clients, list) {
+		pn = &me_cl->props.protocol_name;
+		if (uuid_le_cmp(*uuid, *pn) == 0 &&
+		    me_cl->client_id == client_id)
 			return mei_me_cl_get(me_cl);
+	}
 
 	return NULL;
 }
 
+
 /**
  * mei_me_cl_by_uuid_id - locate me client by client id and uuid
  *	increases ref count
@@ -135,21 +231,18 @@ struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
  * @uuid: me client uuid
  * @client_id: me client id
  *
- * Locking: called under "dev->device_lock" lock
- *
- * Return: me client or NULL if not found
+ * Return: me client or null if not found
  */
 struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
 					   const uuid_le *uuid, u8 client_id)
 {
 	struct mei_me_client *me_cl;
 
-	list_for_each_entry(me_cl, &dev->me_clients, list)
-		if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0 &&
-		    me_cl->client_id == client_id)
-			return mei_me_cl_get(me_cl);
+	down_read(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid_id(dev, uuid, client_id);
+	up_read(&dev->me_clients_rwsem);
 
-	return NULL;
+	return me_cl;
 }
 
 /**
@@ -162,12 +255,14 @@ struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
  */
 void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
 {
-	struct mei_me_client *me_cl, *next;
+	struct mei_me_client *me_cl;
 
 	dev_dbg(dev->dev, "remove %pUl\n", uuid);
-	list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
-		if (uuid_le_cmp(*uuid, me_cl->props.protocol_name) == 0)
-			mei_me_cl_put(me_cl);
+
+	down_write(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid(dev, uuid);
+	__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
 }
 
 /**
@@ -181,15 +276,14 @@ void mei_me_cl_rm_by_uuid(struct mei_device *dev, const uuid_le *uuid)
  */
 void mei_me_cl_rm_by_uuid_id(struct mei_device *dev, const uuid_le *uuid, u8 id)
 {
-	struct mei_me_client *me_cl, *next;
-	const uuid_le *pn;
+	struct mei_me_client *me_cl;
 
 	dev_dbg(dev->dev, "remove %pUl %d\n", uuid, id);
-	list_for_each_entry_safe(me_cl, next, &dev->me_clients, list) {
-		pn =  &me_cl->props.protocol_name;
-		if (me_cl->client_id == id && uuid_le_cmp(*uuid, *pn) == 0)
-			mei_me_cl_put(me_cl);
-	}
+
+	down_write(&dev->me_clients_rwsem);
+	me_cl = __mei_me_cl_by_uuid_id(dev, uuid, id);
+	__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
 }
 
 /**
@@ -203,12 +297,12 @@ void mei_me_cl_rm_all(struct mei_device *dev)
 {
 	struct mei_me_client *me_cl, *next;
 
+	down_write(&dev->me_clients_rwsem);
 	list_for_each_entry_safe(me_cl, next, &dev->me_clients, list)
-			mei_me_cl_put(me_cl);
+		__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
 }
 
-
-
 /**
  * mei_cl_cmp_id - tells if the clients are the same
  *
@@ -227,7 +321,48 @@ static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
 }
 
 /**
- * mei_io_list_flush - removes cbs belonging to cl.
+ * mei_io_cb_free - free mei_cb_private related memory
+ *
+ * @cb: mei callback struct
+ */
+void mei_io_cb_free(struct mei_cl_cb *cb)
+{
+	if (cb == NULL)
+		return;
+
+	list_del(&cb->list);
+	kfree(cb->buf.data);
+	kfree(cb);
+}
+
+/**
+ * mei_io_cb_init - allocate and initialize io callback
+ *
+ * @cl: mei client
+ * @type: operation type
+ * @fp: pointer to file structure
+ *
+ * Return: mei_cl_cb pointer or NULL;
+ */
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
+				 struct file *fp)
+{
+	struct mei_cl_cb *cb;
+
+	cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	if (!cb)
+		return NULL;
+
+	INIT_LIST_HEAD(&cb->list);
+	cb->file_object = fp;
+	cb->cl = cl;
+	cb->buf_idx = 0;
+	cb->fop_type = type;
+	return cb;
+}
+
+/**
+ * __mei_io_list_flush - removes and frees cbs belonging to cl.
  *
  * @list:  an instance of our list structure
  * @cl:    host client, can be NULL for flushing the whole list
@@ -236,13 +371,12 @@ static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
 static void __mei_io_list_flush(struct mei_cl_cb *list,
 				struct mei_cl *cl, bool free)
 {
-	struct mei_cl_cb *cb;
-	struct mei_cl_cb *next;
+	struct mei_cl_cb *cb, *next;
 
 	/* enable removing everything if no cl is specified */
 	list_for_each_entry_safe(cb, next, &list->list, list) {
 		if (!cl || mei_cl_cmp_id(cl, cb->cl)) {
-			list_del(&cb->list);
+			list_del_init(&cb->list);
 			if (free)
 				mei_io_cb_free(cb);
 		}
@@ -260,7 +394,6 @@ void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
 	__mei_io_list_flush(list, cl, false);
 }
 
-
 /**
  * mei_io_list_free - removes cb belonging to cl and free them
  *
@@ -273,103 +406,107 @@ static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl)
 }
 
 /**
- * mei_io_cb_free - free mei_cb_private related memory
+ * mei_io_cb_alloc_buf - allocate callback buffer
  *
- * @cb: mei callback struct
+ * @cb: io callback structure
+ * @length: size of the buffer
+ *
+ * Return: 0 on success
+ *         -EINVAL if cb is NULL
+ *         -ENOMEM if allocation failed
  */
-void mei_io_cb_free(struct mei_cl_cb *cb)
+int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length)
 {
-	if (cb == NULL)
-		return;
+	if (!cb)
+		return -EINVAL;
 
-	kfree(cb->request_buffer.data);
-	kfree(cb->response_buffer.data);
-	kfree(cb);
+	if (length == 0)
+		return 0;
+
+	cb->buf.data = kmalloc(length, GFP_KERNEL);
+	if (!cb->buf.data)
+		return -ENOMEM;
+	cb->buf.size = length;
+	return 0;
 }
 
 /**
- * mei_io_cb_init - allocate and initialize io callback
+ * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
  *
- * @cl: mei client
- * @fp: pointer to file structure
+ * @cl: host client
+ * @length: size of the buffer
+ * @type: operation type
+ * @fp: associated file pointer (might be NULL)
  *
- * Return: mei_cl_cb pointer or NULL;
+ * Return: cb on success and NULL on failure
  */
-struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
+struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
+				  enum mei_cb_file_ops type, struct file *fp)
 {
 	struct mei_cl_cb *cb;
 
-	cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	cb = mei_io_cb_init(cl, type, fp);
 	if (!cb)
 		return NULL;
 
-	mei_io_list_init(cb);
+	if (mei_io_cb_alloc_buf(cb, length)) {
+		mei_io_cb_free(cb);
+		return NULL;
+	}
 
-	cb->file_object = fp;
-	cb->cl = cl;
-	cb->buf_idx = 0;
 	return cb;
 }
 
 /**
- * mei_io_cb_alloc_req_buf - allocate request buffer
+ * mei_cl_read_cb - find this cl's callback in the read list
+ *     for a specific file
  *
- * @cb: io callback structure
- * @length: size of the buffer
+ * @cl: host client
+ * @fp: file pointer (matching cb file object), may be NULL
  *
- * Return: 0 on success
- *         -EINVAL if cb is NULL
- *         -ENOMEM if allocation failed
+ * Return: cb on success, NULL if cb is not found
  */
-int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length)
+struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl, const struct file *fp)
 {
-	if (!cb)
-		return -EINVAL;
+	struct mei_cl_cb *cb;
 
-	if (length == 0)
-		return 0;
+	list_for_each_entry(cb, &cl->rd_completed, list)
+		if (!fp || fp == cb->file_object)
+			return cb;
 
-	cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
-	if (!cb->request_buffer.data)
-		return -ENOMEM;
-	cb->request_buffer.size = length;
-	return 0;
+	return NULL;
 }
+
 /**
- * mei_io_cb_alloc_resp_buf - allocate response buffer
- *
- * @cb: io callback structure
- * @length: size of the buffer
+ * mei_cl_read_cb_flush - free client's read pending and completed cbs
+ *   for a specific file
  *
- * Return: 0 on success
- *         -EINVAL if cb is NULL
- *         -ENOMEM if allocation failed
+ * @cl: host client
+ * @fp: file pointer (matching cb file object), may be NULL
  */
-int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length)
+void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp)
 {
-	if (!cb)
-		return -EINVAL;
+	struct mei_cl_cb *cb, *next;
 
-	if (length == 0)
-		return 0;
-
-	cb->response_buffer.data = kmalloc(length, GFP_KERNEL);
-	if (!cb->response_buffer.data)
-		return -ENOMEM;
-	cb->response_buffer.size = length;
-	return 0;
-}
+	list_for_each_entry_safe(cb, next, &cl->rd_completed, list)
+		if (!fp || fp == cb->file_object)
+			mei_io_cb_free(cb);
 
 
+	list_for_each_entry_safe(cb, next, &cl->rd_pending, list)
+		if (!fp || fp == cb->file_object)
+			mei_io_cb_free(cb);
+}
 
 /**
  * mei_cl_flush_queues - flushes queue lists belonging to cl.
  *
  * @cl: host client
+ * @fp: file pointer (matching cb file object), may be NULL
  *
  * Return: 0 on success, -EINVAL if cl or cl->dev is NULL.
  */
-int mei_cl_flush_queues(struct mei_cl *cl)
+int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp)
 {
 	struct mei_device *dev;
 
@@ -379,13 +516,15 @@ int mei_cl_flush_queues(struct mei_cl *cl)
 	dev = cl->dev;
 
 	cl_dbg(dev, cl, "remove list entry belonging to cl\n");
-	mei_io_list_flush(&cl->dev->read_list, cl);
 	mei_io_list_free(&cl->dev->write_list, cl);
 	mei_io_list_free(&cl->dev->write_waiting_list, cl);
 	mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
 	mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
 	mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
 	mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
+
+	mei_cl_read_cb_flush(cl, fp);
+
 	return 0;
 }
 
@@ -402,9 +541,10 @@ void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
 	init_waitqueue_head(&cl->wait);
 	init_waitqueue_head(&cl->rx_wait);
 	init_waitqueue_head(&cl->tx_wait);
+	INIT_LIST_HEAD(&cl->rd_completed);
+	INIT_LIST_HEAD(&cl->rd_pending);
 	INIT_LIST_HEAD(&cl->link);
 	INIT_LIST_HEAD(&cl->device_link);
-	cl->reading_state = MEI_IDLE;
 	cl->writing_state = MEI_IDLE;
 	cl->dev = dev;
 }
@@ -429,31 +569,14 @@ struct mei_cl *mei_cl_allocate(struct mei_device *dev)
 }
 
 /**
- * mei_cl_find_read_cb - find this cl's callback in the read list
+ * mei_cl_link - allocate host id in the host map
  *
  * @cl: host client
- *
- * Return: cb on success, NULL on error
- */
-struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl)
-{
-	struct mei_device *dev = cl->dev;
-	struct mei_cl_cb *cb;
-
-	list_for_each_entry(cb, &dev->read_list.list, list)
-		if (mei_cl_cmp_id(cl, cb->cl))
-			return cb;
-	return NULL;
-}
-
-/** mei_cl_link: allocate host id in the host map
- *
- * @cl - host client
- * @id - fixed host id or -1 for generic one
+ * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
  *
  * Return: 0 on success
  *	-EINVAL on incorrect values
- *	-ENONET if client not found
+ *	-EMFILE if open count exceeded.
  */
 int mei_cl_link(struct mei_cl *cl, int id)
 {
@@ -535,28 +658,31 @@ int mei_cl_unlink(struct mei_cl *cl)
 
 void mei_host_client_init(struct work_struct *work)
 {
-	struct mei_device *dev = container_of(work,
-					      struct mei_device, init_work);
+	struct mei_device *dev =
+		container_of(work, struct mei_device, init_work);
 	struct mei_me_client *me_cl;
-	struct mei_client_properties *props;
 
 	mutex_lock(&dev->device_lock);
 
-	list_for_each_entry(me_cl, &dev->me_clients, list) {
-		props = &me_cl->props;
 
-		if (!uuid_le_cmp(props->protocol_name, mei_amthif_guid))
-			mei_amthif_host_init(dev);
-		else if (!uuid_le_cmp(props->protocol_name, mei_wd_guid))
-			mei_wd_host_init(dev);
-		else if (!uuid_le_cmp(props->protocol_name, mei_nfc_guid))
-			mei_nfc_host_init(dev);
+	me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
+	if (me_cl)
+		mei_amthif_host_init(dev);
+	mei_me_cl_put(me_cl);
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_wd_guid);
+	if (me_cl)
+		mei_wd_host_init(dev);
+	mei_me_cl_put(me_cl);
+
+	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
+	if (me_cl)
+		mei_nfc_host_init(dev);
+	mei_me_cl_put(me_cl);
 
-	}
 
 	dev->dev_state = MEI_DEV_ENABLED;
 	dev->reset_count = 0;
-
 	mutex_unlock(&dev->device_lock);
 
 	pm_runtime_mark_last_busy(dev->dev);
@@ -620,13 +746,10 @@ int mei_cl_disconnect(struct mei_cl *cl)
 		return rets;
 	}
 
-	cb = mei_io_cb_init(cl, NULL);
-	if (!cb) {
-		rets = -ENOMEM;
+	cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT, NULL);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
 		goto free;
-	}
-
-	cb->fop_type = MEI_FOP_DISCONNECT;
 
 	if (mei_hbuf_acquire(dev)) {
 		if (mei_hbm_cl_disconnect_req(dev, cl)) {
@@ -727,13 +850,10 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
 		return rets;
 	}
 
-	cb = mei_io_cb_init(cl, file);
-	if (!cb) {
-		rets = -ENOMEM;
+	cb = mei_io_cb_init(cl, MEI_FOP_CONNECT, file);
+	rets = cb ? 0 : -ENOMEM;
+	if (rets)
 		goto out;
-	}
-
-	cb->fop_type = MEI_FOP_CONNECT;
 
 	/* run hbuf acquire last so we don't have to undo */
 	if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
@@ -756,7 +876,7 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
 			mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
 	mutex_lock(&dev->device_lock);
 
-	if (cl->state != MEI_FILE_CONNECTED) {
+	if (!mei_cl_is_connected(cl)) {
 		cl->state = MEI_FILE_DISCONNECTED;
 		/* something went really wrong */
 		if (!cl->status)
@@ -778,6 +898,37 @@ out:
 }
 
 /**
+ * mei_cl_alloc_linked - allocate and link host client
+ *
+ * @dev: the device structure
+ * @id: fixed host id or MEI_HOST_CLIENT_ID_ANY (-1) for generic one
+ *
+ * Return: cl on success ERR_PTR on failure
+ */
+struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id)
+{
+	struct mei_cl *cl;
+	int ret;
+
+	cl = mei_cl_allocate(dev);
+	if (!cl) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	ret = mei_cl_link(cl, id);
+	if (ret)
+		goto err;
+
+	return cl;
+err:
+	kfree(cl);
+	return ERR_PTR(ret);
+}
+
+
+
+/**
  * mei_cl_flow_ctrl_creds - checks flow_control credits for cl.
  *
  * @cl: private data of the file object
@@ -866,10 +1017,11 @@ out:
  *
  * @cl: host client
  * @length: number of bytes to read
+ * @fp: pointer to file structure
  *
  * Return: 0 on success, <0 on failure.
  */
-int mei_cl_read_start(struct mei_cl *cl, size_t length)
+int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
 {
 	struct mei_device *dev;
 	struct mei_cl_cb *cb;
@@ -884,10 +1036,10 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 	if (!mei_cl_is_connected(cl))
 		return -ENODEV;
 
-	if (cl->read_cb) {
-		cl_dbg(dev, cl, "read is pending.\n");
+	/* HW currently supports only one pending read */
+	if (!list_empty(&cl->rd_pending))
 		return -EBUSY;
-	}
+
 	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
 	if (!me_cl) {
 		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
@@ -904,29 +1056,21 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 		return rets;
 	}
 
-	cb = mei_io_cb_init(cl, NULL);
-	if (!cb) {
-		rets = -ENOMEM;
-		goto out;
-	}
-
-	rets = mei_io_cb_alloc_resp_buf(cb, length);
+	cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp);
+	rets = cb ? 0 : -ENOMEM;
 	if (rets)
 		goto out;
 
-	cb->fop_type = MEI_FOP_READ;
 	if (mei_hbuf_acquire(dev)) {
 		rets = mei_hbm_cl_flow_control_req(dev, cl);
 		if (rets < 0)
 			goto out;
 
-		list_add_tail(&cb->list, &dev->read_list.list);
+		list_add_tail(&cb->list, &cl->rd_pending);
 	} else {
 		list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 	}
 
-	cl->read_cb = cb;
-
 out:
 	cl_dbg(dev, cl, "rpm: autosuspend\n");
 	pm_runtime_mark_last_busy(dev->dev);
@@ -964,7 +1108,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 
 	dev = cl->dev;
 
-	buf = &cb->request_buffer;
+	buf = &cb->buf;
 
 	rets = mei_cl_flow_ctrl_creds(cl);
 	if (rets < 0)
@@ -999,7 +1143,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 	}
 
 	cl_dbg(dev, cl, "buf: size = %d idx = %lu\n",
-			cb->request_buffer.size, cb->buf_idx);
+			cb->buf.size, cb->buf_idx);
 
 	rets = mei_write_message(dev, &mei_hdr, buf->data + cb->buf_idx);
 	if (rets) {
@@ -1011,6 +1155,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 	cl->status = 0;
 	cl->writing_state = MEI_WRITING;
 	cb->buf_idx += mei_hdr.length;
+	cb->completed = mei_hdr.msg_complete == 1;
 
 	if (mei_hdr.msg_complete) {
 		if (mei_cl_flow_ctrl_reduce(cl))
@@ -1048,7 +1193,7 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 	dev = cl->dev;
 
 
-	buf = &cb->request_buffer;
+	buf = &cb->buf;
 
 	cl_dbg(dev, cl, "size=%d\n", buf->size);
 
@@ -1059,7 +1204,6 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 		return rets;
 	}
 
-	cb->fop_type = MEI_FOP_WRITE;
 	cb->buf_idx = 0;
 	cl->writing_state = MEI_IDLE;
 
@@ -1099,6 +1243,7 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 
 	cl->writing_state = MEI_WRITING;
 	cb->buf_idx = mei_hdr.length;
+	cb->completed = mei_hdr.msg_complete == 1;
 
 out:
 	if (mei_hdr.msg_complete) {
@@ -1151,11 +1296,10 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
 		if (waitqueue_active(&cl->tx_wait))
 			wake_up_interruptible(&cl->tx_wait);
 
-	} else if (cb->fop_type == MEI_FOP_READ &&
-			MEI_READING == cl->reading_state) {
-		cl->reading_state = MEI_READ_COMPLETE;
+	} else if (cb->fop_type == MEI_FOP_READ) {
+		list_add_tail(&cb->list, &cl->rd_completed);
 		if (waitqueue_active(&cl->rx_wait))
-			wake_up_interruptible(&cl->rx_wait);
+			wake_up_interruptible_all(&cl->rx_wait);
 		else
 			mei_cl_bus_rx_event(cl);
 
diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
index cfcde8e97fc4..0a39e5d45171 100644
--- a/drivers/misc/mei/client.h
+++ b/drivers/misc/mei/client.h
@@ -31,7 +31,10 @@ void mei_me_cl_init(struct mei_me_client *me_cl);
 void mei_me_cl_put(struct mei_me_client *me_cl);
 struct mei_me_client *mei_me_cl_get(struct mei_me_client *me_cl);
 
-struct mei_me_client *mei_me_cl_by_uuid(const struct mei_device *dev,
+void mei_me_cl_add(struct mei_device *dev, struct mei_me_client *me_cl);
+void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl);
+
+struct mei_me_client *mei_me_cl_by_uuid(struct mei_device *dev,
 					const uuid_le *uuid);
 struct mei_me_client *mei_me_cl_by_id(struct mei_device *dev, u8 client_id);
 struct mei_me_client *mei_me_cl_by_uuid_id(struct mei_device *dev,
@@ -44,10 +47,10 @@ void mei_me_cl_rm_all(struct mei_device *dev);
 /*
  * MEI IO Functions
  */
-struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp);
+struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
+				 struct file *fp);
 void mei_io_cb_free(struct mei_cl_cb *priv_cb);
-int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length);
-int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length);
+int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length);
 
 
 /**
@@ -72,9 +75,14 @@ void mei_cl_init(struct mei_cl *cl, struct mei_device *dev);
 int mei_cl_link(struct mei_cl *cl, int id);
 int mei_cl_unlink(struct mei_cl *cl);
 
-int mei_cl_flush_queues(struct mei_cl *cl);
-struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl);
+struct mei_cl *mei_cl_alloc_linked(struct mei_device *dev, int id);
 
+struct mei_cl_cb *mei_cl_read_cb(const struct mei_cl *cl,
+				 const struct file *fp);
+void mei_cl_read_cb_flush(const struct mei_cl *cl, const struct file *fp);
+struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
+				  enum mei_cb_file_ops type, struct file *fp);
+int mei_cl_flush_queues(struct mei_cl *cl, const struct file *fp);
 
 int mei_cl_flow_ctrl_creds(struct mei_cl *cl);
 
@@ -82,23 +90,25 @@ int mei_cl_flow_ctrl_reduce(struct mei_cl *cl);
 /*
  *  MEI input output function prototype
  */
+
+/**
+ * mei_cl_is_connected - host client is connected
+ *
+ * @cl: host clinet
+ *
+ * Return: true if the host clinet is connected
+ */
 static inline bool mei_cl_is_connected(struct mei_cl *cl)
 {
-	return  cl->dev &&
-		cl->dev->dev_state == MEI_DEV_ENABLED &&
-		cl->state == MEI_FILE_CONNECTED;
-}
-static inline bool mei_cl_is_transitioning(struct mei_cl *cl)
-{
-	return  MEI_FILE_INITIALIZING == cl->state ||
-		MEI_FILE_DISCONNECTED == cl->state ||
-		MEI_FILE_DISCONNECTING == cl->state;
+	return  cl->state == MEI_FILE_CONNECTED;
 }
 
 bool mei_cl_is_other_connecting(struct mei_cl *cl);
 int mei_cl_disconnect(struct mei_cl *cl);
 int mei_cl_connect(struct mei_cl *cl, struct file *file);
-int mei_cl_read_start(struct mei_cl *cl, size_t length);
+int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp);
+int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr,
+			struct mei_cl_cb *cmpl_list);
 int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking);
 int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 		     struct mei_cl_cb *cmpl_list);
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index b125380ee871..d9cd7e6ee484 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -28,7 +28,7 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
 					size_t cnt, loff_t *ppos)
 {
 	struct mei_device *dev = fp->private_data;
-	struct mei_me_client *me_cl, *n;
+	struct mei_me_client *me_cl;
 	size_t bufsz = 1;
 	char *buf;
 	int i = 0;
@@ -38,15 +38,14 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
 #define HDR \
 "  |id|fix|         UUID                       |con|msg len|sb|refc|\n"
 
-	mutex_lock(&dev->device_lock);
-
+	down_read(&dev->me_clients_rwsem);
 	list_for_each_entry(me_cl, &dev->me_clients, list)
 		bufsz++;
 
 	bufsz *= sizeof(HDR) + 1;
 	buf = kzalloc(bufsz, GFP_KERNEL);
 	if (!buf) {
-		mutex_unlock(&dev->device_lock);
+		up_read(&dev->me_clients_rwsem);
 		return -ENOMEM;
 	}
 
@@ -56,10 +55,9 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
 	if (dev->dev_state != MEI_DEV_ENABLED)
 		goto out;
 
-	list_for_each_entry_safe(me_cl, n, &dev->me_clients, list) {
+	list_for_each_entry(me_cl, &dev->me_clients, list) {
 
-		me_cl = mei_me_cl_get(me_cl);
-		if (me_cl) {
+		if (mei_me_cl_get(me_cl)) {
 			pos += scnprintf(buf + pos, bufsz - pos,
 				"%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
 				i++, me_cl->client_id,
@@ -69,12 +67,13 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
 				me_cl->props.max_msg_length,
 				me_cl->props.single_recv_buf,
 				atomic_read(&me_cl->refcnt.refcount));
-		}
 
-		mei_me_cl_put(me_cl);
+			mei_me_cl_put(me_cl);
+		}
 	}
+
 out:
-	mutex_unlock(&dev->device_lock);
+	up_read(&dev->me_clients_rwsem);
 	ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
 	kfree(buf);
 	return ret;
@@ -118,7 +117,7 @@ static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
 		pos += scnprintf(buf + pos, bufsz - pos,
 			"%2d|%2d|%4d|%5d|%2d|%2d|\n",
 			i, cl->me_client_id, cl->host_client_id, cl->state,
-			cl->reading_state, cl->writing_state);
+			!list_empty(&cl->rd_completed), cl->writing_state);
 		i++;
 	}
 out:
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index c8412d41e4f1..58da92565c5e 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -338,7 +338,8 @@ static int mei_hbm_me_cl_add(struct mei_device *dev,
 	me_cl->client_id = res->me_addr;
 	me_cl->mei_flow_ctrl_creds = 0;
 
-	list_add(&me_cl->list, &dev->me_clients);
+	mei_me_cl_add(dev, me_cl);
+
 	return 0;
 }
 
@@ -638,7 +639,7 @@ static void mei_hbm_cl_res(struct mei_device *dev,
 			continue;
 
 		if (mei_hbm_cl_addr_equal(cl, rs)) {
-			list_del(&cb->list);
+			list_del_init(&cb->list);
 			break;
 		}
 	}
@@ -683,10 +684,9 @@ static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
 		cl->state = MEI_FILE_DISCONNECTED;
 		cl->timer_count = 0;
 
-		cb = mei_io_cb_init(cl, NULL);
+		cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT_RSP, NULL);
 		if (!cb)
 			return -ENOMEM;
-		cb->fop_type = MEI_FOP_DISCONNECT_RSP;
 		cl_dbg(dev, cl, "add disconnect response as first\n");
 		list_add(&cb->list, &dev->ctrl_wr_list.list);
 	}
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index f8fd503dfbd6..6fb75e62a764 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -25,6 +25,8 @@
 #include "hw-me.h"
 #include "hw-me-regs.h"
 
+#include "mei-trace.h"
+
 /**
  * mei_me_reg_read - Reads 32bit data from the mei device
  *
@@ -61,45 +63,79 @@ static inline void mei_me_reg_write(const struct mei_me_hw *hw,
  *
  * Return: ME_CB_RW register value (u32)
  */
-static u32 mei_me_mecbrw_read(const struct mei_device *dev)
+static inline u32 mei_me_mecbrw_read(const struct mei_device *dev)
 {
 	return mei_me_reg_read(to_me_hw(dev), ME_CB_RW);
 }
+
+/**
+ * mei_me_hcbww_write - write 32bit data to the host circular buffer
+ *
+ * @dev: the device structure
+ * @data: 32bit data to be written to the host circular buffer
+ */
+static inline void mei_me_hcbww_write(struct mei_device *dev, u32 data)
+{
+	mei_me_reg_write(to_me_hw(dev), H_CB_WW, data);
+}
+
 /**
  * mei_me_mecsr_read - Reads 32bit data from the ME CSR
  *
- * @hw: the me hardware structure
+ * @dev: the device structure
  *
  * Return: ME_CSR_HA register value (u32)
  */
-static inline u32 mei_me_mecsr_read(const struct mei_me_hw *hw)
+static inline u32 mei_me_mecsr_read(const struct mei_device *dev)
 {
-	return mei_me_reg_read(hw, ME_CSR_HA);
+	u32 reg;
+
+	reg = mei_me_reg_read(to_me_hw(dev), ME_CSR_HA);
+	trace_mei_reg_read(dev->dev, "ME_CSR_HA", ME_CSR_HA, reg);
+
+	return reg;
 }
 
 /**
  * mei_hcsr_read - Reads 32bit data from the host CSR
  *
- * @hw: the me hardware structure
+ * @dev: the device structure
  *
  * Return: H_CSR register value (u32)
  */
-static inline u32 mei_hcsr_read(const struct mei_me_hw *hw)
+static inline u32 mei_hcsr_read(const struct mei_device *dev)
+{
+	u32 reg;
+
+	reg = mei_me_reg_read(to_me_hw(dev), H_CSR);
+	trace_mei_reg_read(dev->dev, "H_CSR", H_CSR, reg);
+
+	return reg;
+}
+
+/**
+ * mei_hcsr_write - writes H_CSR register to the mei device
+ *
+ * @dev: the device structure
+ * @reg: new register value
+ */
+static inline void mei_hcsr_write(struct mei_device *dev, u32 reg)
 {
-	return mei_me_reg_read(hw, H_CSR);
+	trace_mei_reg_write(dev->dev, "H_CSR", H_CSR, reg);
+	mei_me_reg_write(to_me_hw(dev), H_CSR, reg);
 }
 
 /**
  * mei_hcsr_set - writes H_CSR register to the mei device,
  * and ignores the H_IS bit for it is write-one-to-zero.
  *
- * @hw: the me hardware structure
- * @hcsr: new register value
+ * @dev: the device structure
+ * @reg: new register value
  */
-static inline void mei_hcsr_set(struct mei_me_hw *hw, u32 hcsr)
+static inline void mei_hcsr_set(struct mei_device *dev, u32 reg)
 {
-	hcsr &= ~H_IS;
-	mei_me_reg_write(hw, H_CSR, hcsr);
+	reg &= ~H_IS;
+	mei_hcsr_write(dev, reg);
 }
 
 /**
@@ -141,7 +177,7 @@ static int mei_me_fw_status(struct mei_device *dev,
 static void mei_me_hw_config(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(to_me_hw(dev));
+	u32 hcsr = mei_hcsr_read(dev);
 	/* Doesn't change in runtime */
 	dev->hbuf_depth = (hcsr & H_CBD) >> 24;
 
@@ -170,11 +206,10 @@ static inline enum mei_pg_state mei_me_pg_state(struct mei_device *dev)
  */
 static void mei_me_intr_clear(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	if ((hcsr & H_IS) == H_IS)
-		mei_me_reg_write(hw, H_CSR, hcsr);
+		mei_hcsr_write(dev, hcsr);
 }
 /**
  * mei_me_intr_enable - enables mei device interrupts
@@ -183,11 +218,10 @@ static void mei_me_intr_clear(struct mei_device *dev)
  */
 static void mei_me_intr_enable(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	hcsr |= H_IE;
-	mei_hcsr_set(hw, hcsr);
+	mei_hcsr_set(dev, hcsr);
 }
 
 /**
@@ -197,11 +231,10 @@ static void mei_me_intr_enable(struct mei_device *dev)
  */
 static void mei_me_intr_disable(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	hcsr  &= ~H_IE;
-	mei_hcsr_set(hw, hcsr);
+	mei_hcsr_set(dev, hcsr);
 }
 
 /**
@@ -211,12 +244,11 @@ static void mei_me_intr_disable(struct mei_device *dev)
  */
 static void mei_me_hw_reset_release(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	hcsr |= H_IG;
 	hcsr &= ~H_RST;
-	mei_hcsr_set(hw, hcsr);
+	mei_hcsr_set(dev, hcsr);
 
 	/* complete this write before we set host ready on another CPU */
 	mmiowb();
@@ -231,8 +263,7 @@ static void mei_me_hw_reset_release(struct mei_device *dev)
  */
 static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	/* H_RST may be found lit before reset is started,
 	 * for example if preceding reset flow hasn't completed.
@@ -242,8 +273,8 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
 	if ((hcsr & H_RST) == H_RST) {
 		dev_warn(dev->dev, "H_RST is set = 0x%08X", hcsr);
 		hcsr &= ~H_RST;
-		mei_hcsr_set(hw, hcsr);
-		hcsr = mei_hcsr_read(hw);
+		mei_hcsr_set(dev, hcsr);
+		hcsr = mei_hcsr_read(dev);
 	}
 
 	hcsr |= H_RST | H_IG | H_IS;
@@ -254,13 +285,13 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
 		hcsr &= ~H_IE;
 
 	dev->recvd_hw_ready = false;
-	mei_me_reg_write(hw, H_CSR, hcsr);
+	mei_hcsr_write(dev, hcsr);
 
 	/*
 	 * Host reads the H_CSR once to ensure that the
 	 * posted write to H_CSR completes.
 	 */
-	hcsr = mei_hcsr_read(hw);
+	hcsr = mei_hcsr_read(dev);
 
 	if ((hcsr & H_RST) == 0)
 		dev_warn(dev->dev, "H_RST is not set = 0x%08X", hcsr);
@@ -281,11 +312,10 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
  */
 static void mei_me_host_set_ready(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	hcsr |= H_IE | H_IG | H_RDY;
-	mei_hcsr_set(hw, hcsr);
+	mei_hcsr_set(dev, hcsr);
 }
 
 /**
@@ -296,8 +326,7 @@ static void mei_me_host_set_ready(struct mei_device *dev)
  */
 static bool mei_me_host_is_ready(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 hcsr = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
 	return (hcsr & H_RDY) == H_RDY;
 }
@@ -310,8 +339,7 @@ static bool mei_me_host_is_ready(struct mei_device *dev)
  */
 static bool mei_me_hw_is_ready(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 mecsr = mei_me_mecsr_read(hw);
+	u32 mecsr = mei_me_mecsr_read(dev);
 
 	return (mecsr & ME_RDY_HRA) == ME_RDY_HRA;
 }
@@ -368,11 +396,10 @@ static int mei_me_hw_start(struct mei_device *dev)
  */
 static unsigned char mei_hbuf_filled_slots(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
 	u32 hcsr;
 	char read_ptr, write_ptr;
 
-	hcsr = mei_hcsr_read(hw);
+	hcsr = mei_hcsr_read(dev);
 
 	read_ptr = (char) ((hcsr & H_CBRP) >> 8);
 	write_ptr = (char) ((hcsr & H_CBWP) >> 16);
@@ -439,7 +466,6 @@ static int mei_me_write_message(struct mei_device *dev,
 			struct mei_msg_hdr *header,
 			unsigned char *buf)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
 	unsigned long rem;
 	unsigned long length = header->length;
 	u32 *reg_buf = (u32 *)buf;
@@ -457,21 +483,21 @@ static int mei_me_write_message(struct mei_device *dev,
 	if (empty_slots < 0 || dw_cnt > empty_slots)
 		return -EMSGSIZE;
 
-	mei_me_reg_write(hw, H_CB_WW, *((u32 *) header));
+	mei_me_hcbww_write(dev, *((u32 *) header));
 
 	for (i = 0; i < length / 4; i++)
-		mei_me_reg_write(hw, H_CB_WW, reg_buf[i]);
+		mei_me_hcbww_write(dev, reg_buf[i]);
 
 	rem = length & 0x3;
 	if (rem > 0) {
 		u32 reg = 0;
 
 		memcpy(&reg, &buf[length - rem], rem);
-		mei_me_reg_write(hw, H_CB_WW, reg);
+		mei_me_hcbww_write(dev, reg);
 	}
 
-	hcsr = mei_hcsr_read(hw) | H_IG;
-	mei_hcsr_set(hw, hcsr);
+	hcsr = mei_hcsr_read(dev) | H_IG;
+	mei_hcsr_set(dev, hcsr);
 	if (!mei_me_hw_is_ready(dev))
 		return -EIO;
 
@@ -487,12 +513,11 @@ static int mei_me_write_message(struct mei_device *dev,
  */
 static int mei_me_count_full_read_slots(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
 	u32 me_csr;
 	char read_ptr, write_ptr;
 	unsigned char buffer_depth, filled_slots;
 
-	me_csr = mei_me_mecsr_read(hw);
+	me_csr = mei_me_mecsr_read(dev);
 	buffer_depth = (unsigned char)((me_csr & ME_CBD_HRA) >> 24);
 	read_ptr = (char) ((me_csr & ME_CBRP_HRA) >> 8);
 	write_ptr = (char) ((me_csr & ME_CBWP_HRA) >> 16);
@@ -518,7 +543,6 @@ static int mei_me_count_full_read_slots(struct mei_device *dev)
 static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
 		    unsigned long buffer_length)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
 	u32 *reg_buf = (u32 *)buffer;
 	u32 hcsr;
 
@@ -531,49 +555,59 @@ static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
 		memcpy(reg_buf, &reg, buffer_length);
 	}
 
-	hcsr = mei_hcsr_read(hw) | H_IG;
-	mei_hcsr_set(hw, hcsr);
+	hcsr = mei_hcsr_read(dev) | H_IG;
+	mei_hcsr_set(dev, hcsr);
 	return 0;
 }
 
 /**
- * mei_me_pg_enter - write pg enter register
+ * mei_me_pg_set - write pg enter register
  *
  * @dev: the device structure
  */
-static void mei_me_pg_enter(struct mei_device *dev)
+static void mei_me_pg_set(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 reg = mei_me_reg_read(hw, H_HPG_CSR);
+	u32 reg;
+
+	reg = mei_me_reg_read(hw, H_HPG_CSR);
+	trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 
 	reg |= H_HPG_CSR_PGI;
+
+	trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 	mei_me_reg_write(hw, H_HPG_CSR, reg);
 }
 
 /**
- * mei_me_pg_exit - write pg exit register
+ * mei_me_pg_unset - write pg exit register
  *
  * @dev: the device structure
  */
-static void mei_me_pg_exit(struct mei_device *dev)
+static void mei_me_pg_unset(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 reg = mei_me_reg_read(hw, H_HPG_CSR);
+	u32 reg;
+
+	reg = mei_me_reg_read(hw, H_HPG_CSR);
+	trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 
 	WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n");
 
 	reg |= H_HPG_CSR_PGIHEXR;
+
+	trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 	mei_me_reg_write(hw, H_HPG_CSR, reg);
 }
 
 /**
- * mei_me_pg_set_sync - perform pg entry procedure
+ * mei_me_pg_enter_sync - perform pg entry procedure
  *
  * @dev: the device structure
  *
  * Return: 0 on success an error code otherwise
  */
-int mei_me_pg_set_sync(struct mei_device *dev)
+int mei_me_pg_enter_sync(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
 	unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
@@ -591,7 +625,7 @@ int mei_me_pg_set_sync(struct mei_device *dev)
 	mutex_lock(&dev->device_lock);
 
 	if (dev->pg_event == MEI_PG_EVENT_RECEIVED) {
-		mei_me_pg_enter(dev);
+		mei_me_pg_set(dev);
 		ret = 0;
 	} else {
 		ret = -ETIME;
@@ -604,13 +638,13 @@ int mei_me_pg_set_sync(struct mei_device *dev)
 }
 
 /**
- * mei_me_pg_unset_sync - perform pg exit procedure
+ * mei_me_pg_exit_sync - perform pg exit procedure
  *
  * @dev: the device structure
  *
  * Return: 0 on success an error code otherwise
  */
-int mei_me_pg_unset_sync(struct mei_device *dev)
+int mei_me_pg_exit_sync(struct mei_device *dev)
 {
 	struct mei_me_hw *hw = to_me_hw(dev);
 	unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
@@ -621,7 +655,7 @@ int mei_me_pg_unset_sync(struct mei_device *dev)
 
 	dev->pg_event = MEI_PG_EVENT_WAIT;
 
-	mei_me_pg_exit(dev);
+	mei_me_pg_unset(dev);
 
 	mutex_unlock(&dev->device_lock);
 	wait_event_timeout(dev->wait_pg,
@@ -649,8 +683,7 @@ reply:
  */
 static bool mei_me_pg_is_enabled(struct mei_device *dev)
 {
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 reg = mei_me_reg_read(hw, ME_CSR_HA);
+	u32 reg = mei_me_mecsr_read(dev);
 
 	if ((reg & ME_PGIC_HRA) == 0)
 		goto notsupported;
@@ -683,14 +716,13 @@ notsupported:
 irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id)
 {
 	struct mei_device *dev = (struct mei_device *) dev_id;
-	struct mei_me_hw *hw = to_me_hw(dev);
-	u32 csr_reg = mei_hcsr_read(hw);
+	u32 hcsr = mei_hcsr_read(dev);
 
-	if ((csr_reg & H_IS) != H_IS)
+	if ((hcsr & H_IS) != H_IS)
 		return IRQ_NONE;
 
 	/* clear H_IS bit in H_CSR */
-	mei_me_reg_write(hw, H_CSR, csr_reg);
+	mei_hcsr_write(dev, hcsr);
 
 	return IRQ_WAKE_THREAD;
 }
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index d6567af44377..6022d52af6f6 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -71,8 +71,8 @@ extern const struct mei_cfg mei_me_pch8_sps_cfg;
 struct mei_device *mei_me_dev_init(struct pci_dev *pdev,
 				   const struct mei_cfg *cfg);
 
-int mei_me_pg_set_sync(struct mei_device *dev);
-int mei_me_pg_unset_sync(struct mei_device *dev);
+int mei_me_pg_enter_sync(struct mei_device *dev);
+int mei_me_pg_exit_sync(struct mei_device *dev);
 
 irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id);
 irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id);
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index 618ea721aca8..7abafe7d120d 100644
--- a/drivers/misc/mei/hw-txe.c
+++ b/drivers/misc/mei/hw-txe.c
@@ -412,7 +412,7 @@ static void mei_txe_intr_disable(struct mei_device *dev)
 	mei_txe_br_reg_write(hw, HIER_REG, 0);
 }
 /**
- * mei_txe_intr_disable - enable all interrupts
+ * mei_txe_intr_enable - enable all interrupts
  *
  * @dev: the device structure
  */
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index 6ad049a08e4d..97353cf8d9b6 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -389,6 +389,7 @@ void mei_device_init(struct mei_device *dev,
 	INIT_LIST_HEAD(&dev->device_list);
 	INIT_LIST_HEAD(&dev->me_clients);
 	mutex_init(&dev->device_lock);
+	init_rwsem(&dev->me_clients_rwsem);
 	init_waitqueue_head(&dev->wait_hw_ready);
 	init_waitqueue_head(&dev->wait_pg);
 	init_waitqueue_head(&dev->wait_hbm_start);
@@ -396,7 +397,6 @@ void mei_device_init(struct mei_device *dev,
 	dev->dev_state = MEI_DEV_INITIALIZING;
 	dev->reset_count = 0;
 
-	mei_io_list_init(&dev->read_list);
 	mei_io_list_init(&dev->write_list);
 	mei_io_list_init(&dev->write_waiting_list);
 	mei_io_list_init(&dev->ctrl_wr_list);
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 711cddfa9c99..3f84d2edcde4 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -43,7 +43,7 @@ void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
 
 	list_for_each_entry_safe(cb, next, &compl_list->list, list) {
 		cl = cb->cl;
-		list_del(&cb->list);
+		list_del_init(&cb->list);
 
 		dev_dbg(dev->dev, "completing call back.\n");
 		if (cl == &dev->iamthif_cl)
@@ -68,91 +68,91 @@ static inline int mei_cl_hbm_equal(struct mei_cl *cl,
 	return cl->host_client_id == mei_hdr->host_addr &&
 		cl->me_client_id == mei_hdr->me_addr;
 }
+
 /**
- * mei_cl_is_reading - checks if the client
- *		is the one to read this message
- *
- * @cl: mei client
- * @mei_hdr: header of mei message
+ * mei_irq_discard_msg  - discard received message
  *
- * Return: true on match and false otherwise
+ * @dev: mei device
+ * @hdr: message header
  */
-static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
+static inline
+void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
 {
-	return mei_cl_hbm_equal(cl, mei_hdr) &&
-		cl->state == MEI_FILE_CONNECTED &&
-		cl->reading_state != MEI_READ_COMPLETE;
+	/*
+	 * no need to check for size as it is guarantied
+	 * that length fits into rd_msg_buf
+	 */
+	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
+	dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
+		MEI_HDR_PRM(hdr));
 }
 
 /**
  * mei_cl_irq_read_msg - process client message
  *
- * @dev: the device structure
+ * @cl: reading client
  * @mei_hdr: header of mei client message
- * @complete_list: An instance of our list structure
+ * @complete_list: completion list
  *
- * Return: 0 on success, <0 on failure.
+ * Return: always 0
  */
-static int mei_cl_irq_read_msg(struct mei_device *dev,
-			       struct mei_msg_hdr *mei_hdr,
-			       struct mei_cl_cb *complete_list)
+int mei_cl_irq_read_msg(struct mei_cl *cl,
+		       struct mei_msg_hdr *mei_hdr,
+		       struct mei_cl_cb *complete_list)
 {
-	struct mei_cl *cl;
-	struct mei_cl_cb *cb, *next;
+	struct mei_device *dev = cl->dev;
+	struct mei_cl_cb *cb;
 	unsigned char *buffer = NULL;
 
-	list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
-		cl = cb->cl;
-		if (!mei_cl_is_reading(cl, mei_hdr))
-			continue;
-
-		cl->reading_state = MEI_READING;
+	cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
+	if (!cb) {
+		cl_err(dev, cl, "pending read cb not found\n");
+		goto out;
+	}
 
-		if (cb->response_buffer.size == 0 ||
-		    cb->response_buffer.data == NULL) {
-			cl_err(dev, cl, "response buffer is not allocated.\n");
-			list_del(&cb->list);
-			return -ENOMEM;
-		}
+	if (!mei_cl_is_connected(cl)) {
+		cl_dbg(dev, cl, "not connected\n");
+		cb->status = -ENODEV;
+		goto out;
+	}
 
-		if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
-			cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
-				cb->response_buffer.size,
-				mei_hdr->length, cb->buf_idx);
-			buffer = krealloc(cb->response_buffer.data,
-					  mei_hdr->length + cb->buf_idx,
-					  GFP_KERNEL);
-
-			if (!buffer) {
-				list_del(&cb->list);
-				return -ENOMEM;
-			}
-			cb->response_buffer.data = buffer;
-			cb->response_buffer.size =
-				mei_hdr->length + cb->buf_idx;
-		}
+	if (cb->buf.size == 0 || cb->buf.data == NULL) {
+		cl_err(dev, cl, "response buffer is not allocated.\n");
+		list_move_tail(&cb->list, &complete_list->list);
+		cb->status = -ENOMEM;
+		goto out;
+	}
 
-		buffer = cb->response_buffer.data + cb->buf_idx;
-		mei_read_slots(dev, buffer, mei_hdr->length);
+	if (cb->buf.size < mei_hdr->length + cb->buf_idx) {
+		cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
+			cb->buf.size, mei_hdr->length, cb->buf_idx);
+		buffer = krealloc(cb->buf.data, mei_hdr->length + cb->buf_idx,
+				  GFP_KERNEL);
 
-		cb->buf_idx += mei_hdr->length;
-		if (mei_hdr->msg_complete) {
-			cl->status = 0;
-			list_del(&cb->list);
-			cl_dbg(dev, cl, "completed read length = %lu\n",
-				cb->buf_idx);
-			list_add_tail(&cb->list, &complete_list->list);
+		if (!buffer) {
+			cb->status = -ENOMEM;
+			list_move_tail(&cb->list, &complete_list->list);
+			goto out;
 		}
-		break;
+		cb->buf.data = buffer;
+		cb->buf.size = mei_hdr->length + cb->buf_idx;
 	}
 
-	dev_dbg(dev->dev, "message read\n");
-	if (!buffer) {
-		mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
-		dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
-				MEI_HDR_PRM(mei_hdr));
+	buffer = cb->buf.data + cb->buf_idx;
+	mei_read_slots(dev, buffer, mei_hdr->length);
+
+	cb->buf_idx += mei_hdr->length;
+
+	if (mei_hdr->msg_complete) {
+		cb->read_time = jiffies;
+		cl_dbg(dev, cl, "completed read length = %lu\n", cb->buf_idx);
+		list_move_tail(&cb->list, &complete_list->list);
 	}
 
+out:
+	if (!buffer)
+		mei_irq_discard_msg(dev, mei_hdr);
+
 	return 0;
 }
 
@@ -183,7 +183,6 @@ static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
 
 	cl->state = MEI_FILE_DISCONNECTED;
 	cl->status = 0;
-	list_del(&cb->list);
 	mei_io_cb_free(cb);
 
 	return ret;
@@ -263,7 +262,7 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
 		return ret;
 	}
 
-	list_move_tail(&cb->list, &dev->read_list.list);
+	list_move_tail(&cb->list, &cl->rd_pending);
 
 	return 0;
 }
@@ -301,7 +300,7 @@ static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
 	if (ret) {
 		cl->status = ret;
 		cb->buf_idx = 0;
-		list_del(&cb->list);
+		list_del_init(&cb->list);
 		return ret;
 	}
 
@@ -378,25 +377,13 @@ int mei_irq_read_handler(struct mei_device *dev,
 		goto end;
 	}
 
-	if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
-	    MEI_FILE_CONNECTED == dev->iamthif_cl.state &&
-	    dev->iamthif_state == MEI_IAMTHIF_READING) {
-
-		ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
-		if (ret) {
-			dev_err(dev->dev, "mei_amthif_irq_read_msg failed = %d\n",
-					ret);
-			goto end;
-		}
+	if (cl == &dev->iamthif_cl) {
+		ret = mei_amthif_irq_read_msg(cl, mei_hdr, cmpl_list);
 	} else {
-		ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
-		if (ret) {
-			dev_err(dev->dev, "mei_cl_irq_read_msg failed = %d\n",
-					ret);
-			goto end;
-		}
+		ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
 	}
 
+
 reset_slots:
 	/* reset the number of slots and header */
 	*slots = mei_count_full_read_slots(dev);
@@ -449,21 +436,9 @@ int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 		cl = cb->cl;
 
 		cl->status = 0;
-		list_del(&cb->list);
-		if (cb->fop_type == MEI_FOP_WRITE &&
-		    cl != &dev->iamthif_cl) {
-			cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
-			cl->writing_state = MEI_WRITE_COMPLETE;
-			list_add_tail(&cb->list, &cmpl_list->list);
-		}
-		if (cl == &dev->iamthif_cl) {
-			cl_dbg(dev, cl, "check iamthif flow control.\n");
-			if (dev->iamthif_flow_control_pending) {
-				ret = mei_amthif_irq_read(dev, &slots);
-				if (ret)
-					return ret;
-			}
-		}
+		cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
+		cl->writing_state = MEI_WRITE_COMPLETE;
+		list_move_tail(&cb->list, &cmpl_list->list);
 	}
 
 	if (dev->wd_state == MEI_WD_STOPPING) {
@@ -587,10 +562,7 @@ void mei_timer(struct work_struct *work)
 		if (--dev->iamthif_stall_timer == 0) {
 			dev_err(dev->dev, "timer: amthif  hanged.\n");
 			mei_reset(dev);
-			dev->iamthif_msg_buf_size = 0;
-			dev->iamthif_msg_buf_index = 0;
 			dev->iamthif_canceled = false;
-			dev->iamthif_ioctl = true;
 			dev->iamthif_state = MEI_IAMTHIF_IDLE;
 			dev->iamthif_timer = 0;
 
@@ -636,4 +608,3 @@ out:
 		schedule_delayed_work(&dev->timer_work, 2 * HZ);
 	mutex_unlock(&dev->device_lock);
 }
-
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 47680c84801c..3e2968159506 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -58,24 +58,18 @@ static int mei_open(struct inode *inode, struct file *file)
 
 	mutex_lock(&dev->device_lock);
 
-	cl = NULL;
-
-	err = -ENODEV;
 	if (dev->dev_state != MEI_DEV_ENABLED) {
 		dev_dbg(dev->dev, "dev_state != MEI_ENABLED  dev_state = %s\n",
 		    mei_dev_state_str(dev->dev_state));
+		err = -ENODEV;
 		goto err_unlock;
 	}
 
-	err = -ENOMEM;
-	cl = mei_cl_allocate(dev);
-	if (!cl)
-		goto err_unlock;
-
-	/* open_handle_count check is handled in the mei_cl_link */
-	err = mei_cl_link(cl, MEI_HOST_CLIENT_ID_ANY);
-	if (err)
+	cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl)) {
+		err = PTR_ERR(cl);
 		goto err_unlock;
+	}
 
 	file->private_data = cl;
 
@@ -85,7 +79,6 @@ static int mei_open(struct inode *inode, struct file *file)
 
 err_unlock:
 	mutex_unlock(&dev->device_lock);
-	kfree(cl);
 	return err;
 }
 
@@ -100,7 +93,6 @@ err_unlock:
 static int mei_release(struct inode *inode, struct file *file)
 {
 	struct mei_cl *cl = file->private_data;
-	struct mei_cl_cb *cb;
 	struct mei_device *dev;
 	int rets = 0;
 
@@ -114,33 +106,18 @@ static int mei_release(struct inode *inode, struct file *file)
 		rets = mei_amthif_release(dev, file);
 		goto out;
 	}
-	if (cl->state == MEI_FILE_CONNECTED) {
+	if (mei_cl_is_connected(cl)) {
 		cl->state = MEI_FILE_DISCONNECTING;
 		cl_dbg(dev, cl, "disconnecting\n");
 		rets = mei_cl_disconnect(cl);
 	}
-	mei_cl_flush_queues(cl);
+	mei_cl_flush_queues(cl, file);
 	cl_dbg(dev, cl, "removing\n");
 
 	mei_cl_unlink(cl);
 
-
-	/* free read cb */
-	cb = NULL;
-	if (cl->read_cb) {
-		cb = mei_cl_find_read_cb(cl);
-		/* Remove entry from read list */
-		if (cb)
-			list_del(&cb->list);
-
-		cb = cl->read_cb;
-		cl->read_cb = NULL;
-	}
-
 	file->private_data = NULL;
 
-	mei_io_cb_free(cb);
-
 	kfree(cl);
 out:
 	mutex_unlock(&dev->device_lock);
@@ -162,9 +139,8 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 			size_t length, loff_t *offset)
 {
 	struct mei_cl *cl = file->private_data;
-	struct mei_cl_cb *cb_pos = NULL;
-	struct mei_cl_cb *cb = NULL;
 	struct mei_device *dev;
+	struct mei_cl_cb *cb = NULL;
 	int rets;
 	int err;
 
@@ -191,8 +167,8 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		goto out;
 	}
 
-	if (cl->read_cb) {
-		cb = cl->read_cb;
+	cb = mei_cl_read_cb(cl, file);
+	if (cb) {
 		/* read what left */
 		if (cb->buf_idx > *offset)
 			goto copy_buffer;
@@ -208,7 +184,7 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		*offset = 0;
 	}
 
-	err = mei_cl_read_start(cl, length);
+	err = mei_cl_read_start(cl, length, file);
 	if (err && err != -EBUSY) {
 		dev_dbg(dev->dev,
 			"mei start read failure with status = %d\n", err);
@@ -216,8 +192,7 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		goto out;
 	}
 
-	if (MEI_READ_COMPLETE != cl->reading_state &&
-			!waitqueue_active(&cl->rx_wait)) {
+	if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) {
 		if (file->f_flags & O_NONBLOCK) {
 			rets = -EAGAIN;
 			goto out;
@@ -226,8 +201,8 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		mutex_unlock(&dev->device_lock);
 
 		if (wait_event_interruptible(cl->rx_wait,
-				MEI_READ_COMPLETE == cl->reading_state ||
-				mei_cl_is_transitioning(cl))) {
+				(!list_empty(&cl->rd_completed)) ||
+				(!mei_cl_is_connected(cl)))) {
 
 			if (signal_pending(current))
 				return -EINTR;
@@ -235,26 +210,28 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 		}
 
 		mutex_lock(&dev->device_lock);
-		if (mei_cl_is_transitioning(cl)) {
+		if (!mei_cl_is_connected(cl)) {
 			rets = -EBUSY;
 			goto out;
 		}
 	}
 
-	cb = cl->read_cb;
-
+	cb = mei_cl_read_cb(cl, file);
 	if (!cb) {
-		rets = -ENODEV;
-		goto out;
-	}
-	if (cl->reading_state != MEI_READ_COMPLETE) {
 		rets = 0;
 		goto out;
 	}
-	/* now copy the data to user space */
+
 copy_buffer:
+	/* now copy the data to user space */
+	if (cb->status) {
+		rets = cb->status;
+		dev_dbg(dev->dev, "read operation failed %d\n", rets);
+		goto free;
+	}
+
 	dev_dbg(dev->dev, "buf.size = %d buf.idx= %ld\n",
-	    cb->response_buffer.size, cb->buf_idx);
+	    cb->buf.size, cb->buf_idx);
 	if (length == 0 || ubuf == NULL || *offset > cb->buf_idx) {
 		rets = -EMSGSIZE;
 		goto free;
@@ -264,7 +241,7 @@ copy_buffer:
 	 * however buf_idx may point beyond that */
 	length = min_t(size_t, length, cb->buf_idx - *offset);
 
-	if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
+	if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
 		dev_dbg(dev->dev, "failed to copy data to userland\n");
 		rets = -EFAULT;
 		goto free;
@@ -276,13 +253,8 @@ copy_buffer:
 		goto out;
 
 free:
-	cb_pos = mei_cl_find_read_cb(cl);
-	/* Remove entry from read list */
-	if (cb_pos)
-		list_del(&cb_pos->list);
 	mei_io_cb_free(cb);
-	cl->reading_state = MEI_IDLE;
-	cl->read_cb = NULL;
+
 out:
 	dev_dbg(dev->dev, "end mei read rets= %d\n", rets);
 	mutex_unlock(&dev->device_lock);
@@ -336,9 +308,8 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 		goto out;
 	}
 
-	if (cl->state != MEI_FILE_CONNECTED) {
-		dev_err(dev->dev, "host client = %d,  is not connected to ME client = %d",
-			cl->host_client_id, cl->me_client_id);
+	if (!mei_cl_is_connected(cl)) {
+		cl_err(dev, cl, "is not connected");
 		rets = -ENODEV;
 		goto out;
 	}
@@ -349,41 +320,22 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 			timeout = write_cb->read_time +
 				mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
 
-			if (time_after(jiffies, timeout) ||
-			    cl->reading_state == MEI_READ_COMPLETE) {
+			if (time_after(jiffies, timeout)) {
 				*offset = 0;
-				list_del(&write_cb->list);
 				mei_io_cb_free(write_cb);
 				write_cb = NULL;
 			}
 		}
 	}
 
-	/* free entry used in read */
-	if (cl->reading_state == MEI_READ_COMPLETE) {
-		*offset = 0;
-		write_cb = mei_cl_find_read_cb(cl);
-		if (write_cb) {
-			list_del(&write_cb->list);
-			mei_io_cb_free(write_cb);
-			write_cb = NULL;
-			cl->reading_state = MEI_IDLE;
-			cl->read_cb = NULL;
-		}
-	} else if (cl->reading_state == MEI_IDLE)
-		*offset = 0;
-
-
-	write_cb = mei_io_cb_init(cl, file);
+	*offset = 0;
+	write_cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
 	if (!write_cb) {
 		rets = -ENOMEM;
 		goto out;
 	}
-	rets = mei_io_cb_alloc_req_buf(write_cb, length);
-	if (rets)
-		goto out;
 
-	rets = copy_from_user(write_cb->request_buffer.data, ubuf, length);
+	rets = copy_from_user(write_cb->buf.data, ubuf, length);
 	if (rets) {
 		dev_dbg(dev->dev, "failed to copy data from userland\n");
 		rets = -EFAULT;
@@ -391,7 +343,7 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 	}
 
 	if (cl == &dev->iamthif_cl) {
-		rets = mei_amthif_write(dev, write_cb);
+		rets = mei_amthif_write(cl, write_cb);
 
 		if (rets) {
 			dev_err(dev->dev,
@@ -464,7 +416,7 @@ static int mei_ioctl_connect_client(struct file *file,
 	 */
 	if (uuid_le_cmp(data->in_client_uuid, mei_amthif_guid) == 0) {
 		dev_dbg(dev->dev, "FW Client is amthi\n");
-		if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
+		if (!mei_cl_is_connected(&dev->iamthif_cl)) {
 			rets = -ENODEV;
 			goto end;
 		}
@@ -588,6 +540,7 @@ static long mei_compat_ioctl(struct file *file,
  */
 static unsigned int mei_poll(struct file *file, poll_table *wait)
 {
+	unsigned long req_events = poll_requested_events(wait);
 	struct mei_cl *cl = file->private_data;
 	struct mei_device *dev;
 	unsigned int mask = 0;
@@ -599,27 +552,26 @@ static unsigned int mei_poll(struct file *file, poll_table *wait)
 
 	mutex_lock(&dev->device_lock);
 
-	if (!mei_cl_is_connected(cl)) {
+
+	if (dev->dev_state != MEI_DEV_ENABLED ||
+	    !mei_cl_is_connected(cl)) {
 		mask = POLLERR;
 		goto out;
 	}
 
-	mutex_unlock(&dev->device_lock);
-
-
-	if (cl == &dev->iamthif_cl)
-		return mei_amthif_poll(dev, file, wait);
-
-	poll_wait(file, &cl->tx_wait, wait);
-
-	mutex_lock(&dev->device_lock);
-
-	if (!mei_cl_is_connected(cl)) {
-		mask = POLLERR;
+	if (cl == &dev->iamthif_cl) {
+		mask = mei_amthif_poll(dev, file, wait);
 		goto out;
 	}
 
-	mask |= (POLLIN | POLLRDNORM);
+	if (req_events & (POLLIN | POLLRDNORM)) {
+		poll_wait(file, &cl->rx_wait, wait);
+
+		if (!list_empty(&cl->rd_completed))
+			mask |= POLLIN | POLLRDNORM;
+		else
+			mei_cl_read_start(cl, 0, file);
+	}
 
 out:
 	mutex_unlock(&dev->device_lock);
diff --git a/drivers/misc/mei/mei-trace.c b/drivers/misc/mei/mei-trace.c
new file mode 100644
index 000000000000..388efb519138
--- /dev/null
+++ b/drivers/misc/mei/mei-trace.c
@@ -0,0 +1,25 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+#include <linux/module.h>
+
+/* sparse doesn't like tracepoint macros */
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "mei-trace.h"
+
+EXPORT_TRACEPOINT_SYMBOL(mei_reg_read);
+EXPORT_TRACEPOINT_SYMBOL(mei_reg_write);
+#endif /* __CHECKER__ */
diff --git a/drivers/misc/mei/mei-trace.h b/drivers/misc/mei/mei-trace.h
new file mode 100644
index 000000000000..47e1bc6551d4
--- /dev/null
+++ b/drivers/misc/mei/mei-trace.h
@@ -0,0 +1,74 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#if !defined(_MEI_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
+#define _MEI_TRACE_H_
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+#include <linux/device.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mei
+
+TRACE_EVENT(mei_reg_read,
+	TP_PROTO(const struct device *dev, const char *reg, u32 offs, u32 val),
+	TP_ARGS(dev, reg, offs, val),
+	TP_STRUCT__entry(
+		__string(dev, dev_name(dev))
+		__field(const char *, reg)
+		__field(u32, offs)
+		__field(u32, val)
+	),
+	TP_fast_assign(
+		__assign_str(dev, dev_name(dev))
+		__entry->reg  = reg;
+		__entry->offs = offs;
+		__entry->val = val;
+	),
+	TP_printk("[%s] read %s:[%#x] = %#x",
+		  __get_str(dev), __entry->reg, __entry->offs, __entry->val)
+);
+
+TRACE_EVENT(mei_reg_write,
+	TP_PROTO(const struct device *dev, const char *reg, u32 offs, u32 val),
+	TP_ARGS(dev, reg, offs, val),
+	TP_STRUCT__entry(
+		__string(dev, dev_name(dev))
+		__field(const char *, reg)
+		__field(u32, offs)
+		__field(u32, val)
+	),
+	TP_fast_assign(
+		__assign_str(dev, dev_name(dev))
+		__entry->reg = reg;
+		__entry->offs = offs;
+		__entry->val = val;
+	),
+	TP_printk("[%s] write %s[%#x] = %#x)",
+		  __get_str(dev), __entry->reg,  __entry->offs, __entry->val)
+);
+
+#endif /* _MEI_TRACE_H_ */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE mei-trace
+#include <trace/define_trace.h>
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 6c6ce9381535..f066ecd71939 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -194,23 +194,25 @@ struct mei_cl;
  * @list: link in callback queue
  * @cl: file client who is running this operation
  * @fop_type: file operation type
- * @request_buffer: buffer to store request data
- * @response_buffer: buffer to store response data
+ * @buf: buffer for data associated with the callback
  * @buf_idx: last read index
  * @read_time: last read operation time stamp (iamthif)
  * @file_object: pointer to file structure
+ * @status: io status of the cb
  * @internal: communication between driver and FW flag
+ * @completed: the transfer or reception has completed
  */
 struct mei_cl_cb {
 	struct list_head list;
 	struct mei_cl *cl;
 	enum mei_cb_file_ops fop_type;
-	struct mei_msg_data request_buffer;
-	struct mei_msg_data response_buffer;
+	struct mei_msg_data buf;
 	unsigned long buf_idx;
 	unsigned long read_time;
 	struct file *file_object;
+	int status;
 	u32 internal:1;
+	u32 completed:1;
 };
 
 /**
@@ -229,9 +231,9 @@ struct mei_cl_cb {
  * @me_client_id: me/fw id
  * @mei_flow_ctrl_creds: transmit flow credentials
  * @timer_count:  watchdog timer for operation completion
- * @reading_state: state of the rx
  * @writing_state: state of the tx
- * @read_cb: current pending reading callback
+ * @rd_pending: pending read credits
+ * @rd_completed: completed read
  *
  * @device: device on the mei client bus
  * @device_link:  link to bus clients
@@ -249,9 +251,9 @@ struct mei_cl {
 	u8 me_client_id;
 	u8 mei_flow_ctrl_creds;
 	u8 timer_count;
-	enum mei_file_transaction_states reading_state;
 	enum mei_file_transaction_states writing_state;
-	struct mei_cl_cb *read_cb;
+	struct list_head rd_pending;
+	struct list_head rd_completed;
 
 	/* MEI CL bus data */
 	struct mei_cl_device *device;
@@ -423,7 +425,6 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  * @cdev        : character device
  * @minor       : minor number allocated for device
  *
- * @read_list   : read completion list
  * @write_list  : write pending list
  * @write_waiting_list : write completion list
  * @ctrl_wr_list : pending control write list
@@ -460,6 +461,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  * @version     : HBM protocol version in use
  * @hbm_f_pg_supported : hbm feature pgi protocol
  *
+ * @me_clients_rwsem: rw lock over me_clients list
  * @me_clients  : list of FW clients
  * @me_clients_map : FW clients bit map
  * @host_clients_map : host clients id pool
@@ -480,12 +482,7 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  * @iamthif_mtu : amthif client max message length
  * @iamthif_timer : time stamp of current amthif command completion
  * @iamthif_stall_timer : timer to detect amthif hang
- * @iamthif_msg_buf : amthif current message buffer
- * @iamthif_msg_buf_size : size of current amthif message request buffer
- * @iamthif_msg_buf_index : current index in amthif message request buffer
  * @iamthif_state : amthif processor state
- * @iamthif_flow_control_pending: amthif waits for flow control
- * @iamthif_ioctl : wait for completion if amthif control message
  * @iamthif_canceled : current amthif command is canceled
  *
  * @init_work   : work item for the device init
@@ -503,7 +500,6 @@ struct mei_device {
 	struct cdev cdev;
 	int minor;
 
-	struct mei_cl_cb read_list;
 	struct mei_cl_cb write_list;
 	struct mei_cl_cb write_waiting_list;
 	struct mei_cl_cb ctrl_wr_list;
@@ -556,6 +552,7 @@ struct mei_device {
 	struct hbm_version version;
 	unsigned int hbm_f_pg_supported:1;
 
+	struct rw_semaphore me_clients_rwsem;
 	struct list_head me_clients;
 	DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
 	DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
@@ -579,12 +576,7 @@ struct mei_device {
 	int iamthif_mtu;
 	unsigned long iamthif_timer;
 	u32 iamthif_stall_timer;
-	unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
-	u32 iamthif_msg_buf_size;
-	u32 iamthif_msg_buf_index;
 	enum iamthif_states iamthif_state;
-	bool iamthif_flow_control_pending;
-	bool iamthif_ioctl;
 	bool iamthif_canceled;
 
 	struct work_struct init_work;
@@ -662,8 +654,6 @@ void mei_amthif_reset_params(struct mei_device *dev);
 
 int mei_amthif_host_init(struct mei_device *dev);
 
-int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
-
 int mei_amthif_read(struct mei_device *dev, struct file *file,
 		char __user *ubuf, size_t length, loff_t *offset);
 
@@ -675,13 +665,13 @@ int mei_amthif_release(struct mei_device *dev, struct file *file);
 struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
 						struct file *file);
 
-void mei_amthif_run_next_cmd(struct mei_device *dev);
-
+int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb);
+int mei_amthif_run_next_cmd(struct mei_device *dev);
 int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 			struct mei_cl_cb *cmpl_list);
 
 void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
-int mei_amthif_irq_read_msg(struct mei_device *dev,
+int mei_amthif_irq_read_msg(struct mei_cl *cl,
 			    struct mei_msg_hdr *mei_hdr,
 			    struct mei_cl_cb *complete_list);
 int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c
index bb61a119b8bb..c3bcb63686d7 100644
--- a/drivers/misc/mei/nfc.c
+++ b/drivers/misc/mei/nfc.c
@@ -482,8 +482,8 @@ err:
 int mei_nfc_host_init(struct mei_device *dev)
 {
 	struct mei_nfc_dev *ndev;
-	struct mei_cl *cl_info, *cl = NULL;
-	struct mei_me_client *me_cl;
+	struct mei_cl *cl_info, *cl;
+	struct mei_me_client *me_cl = NULL;
 	int ret;
 
 
@@ -500,17 +500,6 @@ int mei_nfc_host_init(struct mei_device *dev)
 		goto err;
 	}
 
-	ndev->cl_info = mei_cl_allocate(dev);
-	ndev->cl = mei_cl_allocate(dev);
-
-	cl = ndev->cl;
-	cl_info = ndev->cl_info;
-
-	if (!cl || !cl_info) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
 	/* check for valid client id */
 	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
 	if (!me_cl) {
@@ -519,17 +508,21 @@ int mei_nfc_host_init(struct mei_device *dev)
 		goto err;
 	}
 
+	cl_info = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl_info)) {
+		ret = PTR_ERR(cl_info);
+		goto err;
+	}
+
 	cl_info->me_client_id = me_cl->client_id;
 	cl_info->cl_uuid = me_cl->props.protocol_name;
 	mei_me_cl_put(me_cl);
-
-	ret = mei_cl_link(cl_info, MEI_HOST_CLIENT_ID_ANY);
-	if (ret)
-		goto err;
-
+	me_cl = NULL;
 
 	list_add_tail(&cl_info->device_link, &dev->device_list);
 
+	ndev->cl_info = cl_info;
+
 	/* check for valid client id */
 	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
 	if (!me_cl) {
@@ -538,16 +531,21 @@ int mei_nfc_host_init(struct mei_device *dev)
 		goto err;
 	}
 
+	cl = mei_cl_alloc_linked(dev, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl)) {
+		ret = PTR_ERR(cl);
+		goto err;
+	}
+
 	cl->me_client_id = me_cl->client_id;
 	cl->cl_uuid = me_cl->props.protocol_name;
 	mei_me_cl_put(me_cl);
-
-	ret = mei_cl_link(cl, MEI_HOST_CLIENT_ID_ANY);
-	if (ret)
-		goto err;
+	me_cl = NULL;
 
 	list_add_tail(&cl->device_link, &dev->device_list);
 
+	ndev->cl = cl;
+
 	ndev->req_id = 1;
 
 	INIT_WORK(&ndev->init_work, mei_nfc_init);
@@ -557,6 +555,7 @@ int mei_nfc_host_init(struct mei_device *dev)
 	return 0;
 
 err:
+	mei_me_cl_put(me_cl);
 	mei_nfc_free(ndev);
 
 	return ret;
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index af44ee26075d..23f71f5ce4fb 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -388,7 +388,7 @@ static int mei_me_pm_runtime_suspend(struct device *device)
 	mutex_lock(&dev->device_lock);
 
 	if (mei_write_is_idle(dev))
-		ret = mei_me_pg_set_sync(dev);
+		ret = mei_me_pg_enter_sync(dev);
 	else
 		ret = -EAGAIN;
 
@@ -413,7 +413,7 @@ static int mei_me_pm_runtime_resume(struct device *device)
 
 	mutex_lock(&dev->device_lock);
 
-	ret = mei_me_pg_unset_sync(dev);
+	ret = mei_me_pg_exit_sync(dev);
 
 	mutex_unlock(&dev->device_lock);
 
diff --git a/drivers/misc/mei/pci-txe.c b/drivers/misc/mei/pci-txe.c
index c86e2ddbe30a..dcfcba44b6f7 100644
--- a/drivers/misc/mei/pci-txe.c
+++ b/drivers/misc/mei/pci-txe.c
@@ -63,7 +63,7 @@ static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)
 	}
 }
 /**
- * mei_probe - Device Initialization Routine
+ * mei_txe_probe - Device Initialization Routine
  *
  * @pdev: PCI device structure
  * @ent: entry in mei_txe_pci_tbl
@@ -193,7 +193,7 @@ end:
 }
 
 /**
- * mei_remove - Device Removal Routine
+ * mei_txe_remove - Device Removal Routine
  *
  * @pdev: PCI device structure
  *
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index 475f1dea45bf..2725f865c3d6 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -160,9 +160,10 @@ int mei_wd_send(struct mei_device *dev)
  */
 int mei_wd_stop(struct mei_device *dev)
 {
+	struct mei_cl *cl = &dev->wd_cl;
 	int ret;
 
-	if (dev->wd_cl.state != MEI_FILE_CONNECTED ||
+	if (!mei_cl_is_connected(cl) ||
 	    dev->wd_state != MEI_WD_RUNNING)
 		return 0;
 
@@ -170,7 +171,7 @@ int mei_wd_stop(struct mei_device *dev)
 
 	dev->wd_state = MEI_WD_STOPPING;
 
-	ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
+	ret = mei_cl_flow_ctrl_creds(cl);
 	if (ret < 0)
 		goto err;
 
@@ -202,22 +203,25 @@ err:
 	return ret;
 }
 
-/*
+/**
  * mei_wd_ops_start - wd start command from the watchdog core.
  *
- * @wd_dev - watchdog device struct
+ * @wd_dev: watchdog device struct
  *
  * Return: 0 if success, negative errno code for failure
  */
 static int mei_wd_ops_start(struct watchdog_device *wd_dev)
 {
-	int err = -ENODEV;
 	struct mei_device *dev;
+	struct mei_cl *cl;
+	int err = -ENODEV;
 
 	dev = watchdog_get_drvdata(wd_dev);
 	if (!dev)
 		return -ENODEV;
 
+	cl = &dev->wd_cl;
+
 	mutex_lock(&dev->device_lock);
 
 	if (dev->dev_state != MEI_DEV_ENABLED) {
@@ -226,8 +230,8 @@ static int mei_wd_ops_start(struct watchdog_device *wd_dev)
 		goto end_unlock;
 	}
 
-	if (dev->wd_cl.state != MEI_FILE_CONNECTED)	{
-		dev_dbg(dev->dev, "MEI Driver is not connected to Watchdog Client\n");
+	if (!mei_cl_is_connected(cl)) {
+		cl_dbg(dev, cl, "MEI Driver is not connected to Watchdog Client\n");
 		goto end_unlock;
 	}
 
@@ -239,10 +243,10 @@ end_unlock:
 	return err;
 }
 
-/*
+/**
  * mei_wd_ops_stop -  wd stop command from the watchdog core.
  *
- * @wd_dev - watchdog device struct
+ * @wd_dev: watchdog device struct
  *
  * Return: 0 if success, negative errno code for failure
  */
@@ -261,10 +265,10 @@ static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
 	return 0;
 }
 
-/*
+/**
  * mei_wd_ops_ping - wd ping command from the watchdog core.
  *
- * @wd_dev - watchdog device struct
+ * @wd_dev: watchdog device struct
  *
  * Return: 0 if success, negative errno code for failure
  */
@@ -282,8 +286,8 @@ static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
 
 	mutex_lock(&dev->device_lock);
 
-	if (cl->state != MEI_FILE_CONNECTED) {
-		dev_err(dev->dev, "wd: not connected.\n");
+	if (!mei_cl_is_connected(cl)) {
+		cl_err(dev, cl, "wd: not connected.\n");
 		ret = -ENODEV;
 		goto end;
 	}
@@ -311,11 +315,11 @@ end:
 	return ret;
 }
 
-/*
+/**
  * mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
  *
- * @wd_dev - watchdog device struct
- * @timeout - timeout value to set
+ * @wd_dev: watchdog device struct
+ * @timeout: timeout value to set
  *
  * Return: 0 if success, negative errno code for failure
  */
diff --git a/drivers/misc/mic/host/mic_boot.c b/drivers/misc/mic/host/mic_boot.c
index ff2b0fb1a6be..d9fa609da061 100644
--- a/drivers/misc/mic/host/mic_boot.c
+++ b/drivers/misc/mic/host/mic_boot.c
@@ -309,7 +309,7 @@ void mic_complete_resume(struct mic_device *mdev)
  */
 void mic_prepare_suspend(struct mic_device *mdev)
 {
-	int rc;
+	unsigned long timeout;
 
 #define MIC_SUSPEND_TIMEOUT (60 * HZ)
 
@@ -331,10 +331,10 @@ void mic_prepare_suspend(struct mic_device *mdev)
 		 */
 		mic_set_state(mdev, MIC_SUSPENDING);
 		mutex_unlock(&mdev->mic_mutex);
-		rc = wait_for_completion_timeout(&mdev->reset_wait,
-						MIC_SUSPEND_TIMEOUT);
+		timeout = wait_for_completion_timeout(&mdev->reset_wait,
+						      MIC_SUSPEND_TIMEOUT);
 		/* Force reset the card if the shutdown completion timed out */
-		if (!rc) {
+		if (!timeout) {
 			mutex_lock(&mdev->mic_mutex);
 			mic_set_state(mdev, MIC_SUSPENDED);
 			mutex_unlock(&mdev->mic_mutex);
@@ -348,10 +348,10 @@ void mic_prepare_suspend(struct mic_device *mdev)
 		 */
 		mic_set_state(mdev, MIC_SUSPENDED);
 		mutex_unlock(&mdev->mic_mutex);
-		rc = wait_for_completion_timeout(&mdev->reset_wait,
-						MIC_SUSPEND_TIMEOUT);
+		timeout = wait_for_completion_timeout(&mdev->reset_wait,
+						      MIC_SUSPEND_TIMEOUT);
 		/* Force reset the card if the shutdown completion timed out */
-		if (!rc)
+		if (!timeout)
 			mic_stop(mdev, true);
 		break;
 	default:
diff --git a/drivers/misc/mic/host/mic_intr.c b/drivers/misc/mic/host/mic_intr.c
index d686f2846ac7..b4ca6c884d19 100644
--- a/drivers/misc/mic/host/mic_intr.c
+++ b/drivers/misc/mic/host/mic_intr.c
@@ -363,8 +363,6 @@ static int mic_setup_intx(struct mic_device *mdev, struct pci_dev *pdev)
 {
 	int rc;
 
-	pci_msi_off(pdev);
-
 	/* Enable intx */
 	pci_intx(pdev, 1);
 	rc = mic_setup_callbacks(mdev);
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 21181fa243df..eeaaf5fca105 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -69,12 +69,23 @@ static int sram_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&reserve_list);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	virt_base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(virt_base))
-		return PTR_ERR(virt_base);
+	if (!res) {
+		dev_err(&pdev->dev, "found no memory resource\n");
+		return -EINVAL;
+	}
 
 	size = resource_size(res);
 
+	if (!devm_request_mem_region(&pdev->dev,
+			res->start, size, pdev->name)) {
+		dev_err(&pdev->dev, "could not request region for resource\n");
+		return -EBUSY;
+	}
+
+	virt_base = devm_ioremap_wc(&pdev->dev, res->start, size);
+	if (IS_ERR(virt_base))
+		return PTR_ERR(virt_base);
+
 	sram = devm_kzalloc(&pdev->dev, sizeof(*sram), GFP_KERNEL);
 	if (!sram)
 		return -ENOMEM;
@@ -205,7 +216,7 @@ static int sram_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id sram_dt_ids[] = {
+static const struct of_device_id sram_dt_ids[] = {
 	{ .compatible = "mmio-sram" },
 	{}
 };
diff --git a/drivers/misc/tifm_7xx1.c b/drivers/misc/tifm_7xx1.c
index a606c8901e18..a37a42f67088 100644
--- a/drivers/misc/tifm_7xx1.c
+++ b/drivers/misc/tifm_7xx1.c
@@ -236,6 +236,7 @@ static int tifm_7xx1_resume(struct pci_dev *dev)
 {
 	struct tifm_adapter *fm = pci_get_drvdata(dev);
 	int rc;
+	unsigned long timeout;
 	unsigned int good_sockets = 0, bad_sockets = 0;
 	unsigned long flags;
 	unsigned char new_ids[fm->num_sockets];
@@ -272,8 +273,8 @@ static int tifm_7xx1_resume(struct pci_dev *dev)
 	if (good_sockets) {
 		fm->finish_me = &finish_resume;
 		spin_unlock_irqrestore(&fm->lock, flags);
-		rc = wait_for_completion_timeout(&finish_resume, HZ);
-		dev_dbg(&dev->dev, "wait returned %d\n", rc);
+		timeout = wait_for_completion_timeout(&finish_resume, HZ);
+		dev_dbg(&dev->dev, "wait returned %lu\n", timeout);
 		writel(TIFM_IRQ_FIFOMASK(good_sockets)
 		       | TIFM_IRQ_CARDMASK(good_sockets),
 		       fm->addr + FM_CLEAR_INTERRUPT_ENABLE);
diff --git a/drivers/misc/vmw_vmci/vmci_driver.c b/drivers/misc/vmw_vmci/vmci_driver.c
index 032d35cf93ca..b823f9a6e464 100644
--- a/drivers/misc/vmw_vmci/vmci_driver.c
+++ b/drivers/misc/vmw_vmci/vmci_driver.c
@@ -113,5 +113,5 @@ module_exit(vmci_drv_exit);
 
 MODULE_AUTHOR("VMware, Inc.");
 MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
-MODULE_VERSION("1.1.1.0-k");
+MODULE_VERSION("1.1.3.0-k");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c
index 66fc9921fc85..a721b5d8a9da 100644
--- a/drivers/misc/vmw_vmci/vmci_host.c
+++ b/drivers/misc/vmw_vmci/vmci_host.c
@@ -395,6 +395,12 @@ static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
 		return -EFAULT;
 	}
 
+	if (VMCI_DG_SIZE(dg) != send_info.len) {
+		vmci_ioctl_err("datagram size mismatch\n");
+		kfree(dg);
+		return -EINVAL;
+	}
+
 	pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
 		 dg->dst.context, dg->dst.resource,
 		 dg->src.context, dg->src.resource,
diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index 35f19a683822..f42d9c4e4561 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -295,12 +295,20 @@ static void *qp_alloc_queue(u64 size, u32 flags)
 {
 	u64 i;
 	struct vmci_queue *queue;
-	const size_t num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1;
-	const size_t pas_size = num_pages * sizeof(*queue->kernel_if->u.g.pas);
-	const size_t vas_size = num_pages * sizeof(*queue->kernel_if->u.g.vas);
-	const size_t queue_size =
-		sizeof(*queue) + sizeof(*queue->kernel_if) +
-		pas_size + vas_size;
+	size_t pas_size;
+	size_t vas_size;
+	size_t queue_size = sizeof(*queue) + sizeof(*queue->kernel_if);
+	const u64 num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1;
+
+	if (num_pages >
+		 (SIZE_MAX - queue_size) /
+		 (sizeof(*queue->kernel_if->u.g.pas) +
+		  sizeof(*queue->kernel_if->u.g.vas)))
+		return NULL;
+
+	pas_size = num_pages * sizeof(*queue->kernel_if->u.g.pas);
+	vas_size = num_pages * sizeof(*queue->kernel_if->u.g.vas);
+	queue_size += pas_size + vas_size;
 
 	queue = vmalloc(queue_size);
 	if (!queue)
@@ -615,10 +623,15 @@ static int qp_memcpy_from_queue_iov(void *dest,
 static struct vmci_queue *qp_host_alloc_queue(u64 size)
 {
 	struct vmci_queue *queue;
-	const size_t num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1;
+	size_t queue_page_size;
+	const u64 num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1;
 	const size_t queue_size = sizeof(*queue) + sizeof(*(queue->kernel_if));
-	const size_t queue_page_size =
-	    num_pages * sizeof(*queue->kernel_if->u.h.page);
+
+	if (num_pages > (SIZE_MAX - queue_size) /
+		 sizeof(*queue->kernel_if->u.h.page))
+		return NULL;
+
+	queue_page_size = num_pages * sizeof(*queue->kernel_if->u.h.page);
 
 	queue = kzalloc(queue_size + queue_page_size, GFP_KERNEL);
 	if (queue) {
@@ -737,7 +750,8 @@ static int qp_host_get_user_memory(u64 produce_uva,
 				     produce_q->kernel_if->num_pages, 1,
 				     produce_q->kernel_if->u.h.header_page);
 	if (retval < produce_q->kernel_if->num_pages) {
-		pr_warn("get_user_pages(produce) failed (retval=%d)", retval);
+		pr_debug("get_user_pages_fast(produce) failed (retval=%d)",
+			retval);
 		qp_release_pages(produce_q->kernel_if->u.h.header_page,
 				 retval, false);
 		err = VMCI_ERROR_NO_MEM;
@@ -748,7 +762,8 @@ static int qp_host_get_user_memory(u64 produce_uva,
 				     consume_q->kernel_if->num_pages, 1,
 				     consume_q->kernel_if->u.h.header_page);
 	if (retval < consume_q->kernel_if->num_pages) {
-		pr_warn("get_user_pages(consume) failed (retval=%d)", retval);
+		pr_debug("get_user_pages_fast(consume) failed (retval=%d)",
+			retval);
 		qp_release_pages(consume_q->kernel_if->u.h.header_page,
 				 retval, false);
 		qp_release_pages(produce_q->kernel_if->u.h.header_page,
diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c
index 8170102d1e93..4e2f501e5548 100644
--- a/drivers/pcmcia/omap_cf.c
+++ b/drivers/pcmcia/omap_cf.c
@@ -220,9 +220,7 @@ static int __init omap_cf_probe(struct platform_device *pdev)
 	cf = kzalloc(sizeof *cf, GFP_KERNEL);
 	if (!cf)
 		return -ENOMEM;
-	init_timer(&cf->timer);
-	cf->timer.function = omap_cf_timer;
-	cf->timer.data = (unsigned long) cf;
+	setup_timer(&cf->timer, omap_cf_timer, (unsigned long)cf);
 
 	cf->pdev = pdev;
 	platform_set_drvdata(pdev, cf);
diff --git a/drivers/pcmcia/pd6729.c b/drivers/pcmcia/pd6729.c
index 34ace4854dc2..0f70b4d58f9e 100644
--- a/drivers/pcmcia/pd6729.c
+++ b/drivers/pcmcia/pd6729.c
@@ -707,11 +707,9 @@ static int pd6729_pci_probe(struct pci_dev *dev,
 		}
 	} else {
 		/* poll Card status change */
-		init_timer(&socket->poll_timer);
-		socket->poll_timer.function = pd6729_interrupt_wrapper;
-		socket->poll_timer.data = (unsigned long)socket;
-		socket->poll_timer.expires = jiffies + HZ;
-		add_timer(&socket->poll_timer);
+		setup_timer(&socket->poll_timer, pd6729_interrupt_wrapper,
+			    (unsigned long)socket);
+		mod_timer(&socket->poll_timer, jiffies + HZ);
 	}
 
 	for (i = 0; i < MAX_SOCKETS; i++) {
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 933f4657515b..eed5e9c05353 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -726,9 +726,8 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
 {
 	int ret;
 
-	init_timer(&skt->poll_timer);
-	skt->poll_timer.function = soc_common_pcmcia_poll_event;
-	skt->poll_timer.data = (unsigned long)skt;
+	setup_timer(&skt->poll_timer, soc_common_pcmcia_poll_event,
+		    (unsigned long)skt);
 	skt->poll_timer.expires = jiffies + SOC_PCMCIA_POLL_PERIOD;
 
 	ret = request_resource(&iomem_resource, &skt->res_skt);
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 8a23ccb41213..965bd8491233 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -1236,11 +1236,9 @@ static int yenta_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	if (!socket->cb_irq || request_irq(socket->cb_irq, yenta_interrupt, IRQF_SHARED, "yenta", socket)) {
 		/* No IRQ or request_irq failed. Poll */
 		socket->cb_irq = 0; /* But zero is a valid IRQ number. */
-		init_timer(&socket->poll_timer);
-		socket->poll_timer.function = yenta_interrupt_wrapper;
-		socket->poll_timer.data = (unsigned long)socket;
-		socket->poll_timer.expires = jiffies + HZ;
-		add_timer(&socket->poll_timer);
+		setup_timer(&socket->poll_timer, yenta_interrupt_wrapper,
+			    (unsigned long)socket);
+		mod_timer(&socket->poll_timer, jiffies + HZ);
 		dev_printk(KERN_INFO, &dev->dev,
 			   "no PCI IRQ, CardBus support disabled for this "
 			   "socket.\n");
diff --git a/drivers/spmi/Kconfig b/drivers/spmi/Kconfig
index bf1295e19f89..c8d99563d245 100644
--- a/drivers/spmi/Kconfig
+++ b/drivers/spmi/Kconfig
@@ -12,7 +12,6 @@ if SPMI
 
 config SPMI_MSM_PMIC_ARB
 	tristate "Qualcomm MSM SPMI Controller (PMIC Arbiter)"
-	depends on ARM
 	depends on IRQ_DOMAIN
 	depends on ARCH_QCOM || COMPILE_TEST
 	default ARCH_QCOM
diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 20559ab3466d..d7119db49cfe 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1,4 +1,5 @@
-/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+/*
+ * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -25,22 +26,18 @@
 
 /* PMIC Arbiter configuration registers */
 #define PMIC_ARB_VERSION		0x0000
+#define PMIC_ARB_VERSION_V2_MIN		0x20010000
 #define PMIC_ARB_INT_EN			0x0004
 
-/* PMIC Arbiter channel registers */
-#define PMIC_ARB_CMD(N)			(0x0800 + (0x80 * (N)))
-#define PMIC_ARB_CONFIG(N)		(0x0804 + (0x80 * (N)))
-#define PMIC_ARB_STATUS(N)		(0x0808 + (0x80 * (N)))
-#define PMIC_ARB_WDATA0(N)		(0x0810 + (0x80 * (N)))
-#define PMIC_ARB_WDATA1(N)		(0x0814 + (0x80 * (N)))
-#define PMIC_ARB_RDATA0(N)		(0x0818 + (0x80 * (N)))
-#define PMIC_ARB_RDATA1(N)		(0x081C + (0x80 * (N)))
-
-/* Interrupt Controller */
-#define SPMI_PIC_OWNER_ACC_STATUS(M, N)	(0x0000 + ((32 * (M)) + (4 * (N))))
-#define SPMI_PIC_ACC_ENABLE(N)		(0x0200 + (4 * (N)))
-#define SPMI_PIC_IRQ_STATUS(N)		(0x0600 + (4 * (N)))
-#define SPMI_PIC_IRQ_CLEAR(N)		(0x0A00 + (4 * (N)))
+/* PMIC Arbiter channel registers offsets */
+#define PMIC_ARB_CMD			0x00
+#define PMIC_ARB_CONFIG			0x04
+#define PMIC_ARB_STATUS			0x08
+#define PMIC_ARB_WDATA0			0x10
+#define PMIC_ARB_WDATA1			0x14
+#define PMIC_ARB_RDATA0			0x18
+#define PMIC_ARB_RDATA1			0x1C
+#define PMIC_ARB_REG_CHNL(N)		(0x800 + 0x4 * (N))
 
 /* Mapping Table */
 #define SPMI_MAPPING_TABLE_REG(N)	(0x0B00 + (4 * (N)))
@@ -52,6 +49,7 @@
 
 #define SPMI_MAPPING_TABLE_LEN		255
 #define SPMI_MAPPING_TABLE_TREE_DEPTH	16	/* Maximum of 16-bits */
+#define PPID_TO_CHAN_TABLE_SZ		BIT(12)	/* PPID is 12bit chan is 1byte*/
 
 /* Ownership Table */
 #define SPMI_OWNERSHIP_TABLE_REG(N)	(0x0700 + (4 * (N)))
@@ -88,6 +86,7 @@ enum pmic_arb_cmd_op_code {
 
 /* Maximum number of support PMIC peripherals */
 #define PMIC_ARB_MAX_PERIPHS		256
+#define PMIC_ARB_MAX_CHNL		128
 #define PMIC_ARB_PERIPH_ID_VALID	(1 << 15)
 #define PMIC_ARB_TIMEOUT_US		100
 #define PMIC_ARB_MAX_TRANS_BYTES	(8)
@@ -98,14 +97,17 @@ enum pmic_arb_cmd_op_code {
 /* interrupt enable bit */
 #define SPMI_PIC_ACC_ENABLE_BIT		BIT(0)
 
+struct pmic_arb_ver_ops;
+
 /**
  * spmi_pmic_arb_dev - SPMI PMIC Arbiter object
  *
- * @base:		address of the PMIC Arbiter core registers.
+ * @rd_base:		on v1 "core", on v2 "observer" register base off DT.
+ * @wr_base:		on v1 "core", on v2 "chnls"    register base off DT.
  * @intr:		address of the SPMI interrupt control registers.
  * @cnfg:		address of the PMIC Arbiter configuration registers.
  * @lock:		lock to synchronize accesses.
- * @channel:		which channel to use for accesses.
+ * @channel:		execution environment channel to use for accesses.
  * @irq:		PMIC ARB interrupt.
  * @ee:			the current Execution Environment
  * @min_apid:		minimum APID (used for bounding IRQ search)
@@ -113,10 +115,14 @@ enum pmic_arb_cmd_op_code {
  * @mapping_table:	in-memory copy of PPID -> APID mapping table.
  * @domain:		irq domain object for PMIC IRQ domain
  * @spmic:		SPMI controller object
- * @apid_to_ppid:	cached mapping from APID to PPID
+ * @apid_to_ppid:	in-memory copy of APID -> PPID mapping table.
+ * @ver_ops:		version dependent operations.
+ * @ppid_to_chan	in-memory copy of PPID -> channel (APID) mapping table.
+ *			v2 only.
  */
 struct spmi_pmic_arb_dev {
-	void __iomem		*base;
+	void __iomem		*rd_base;
+	void __iomem		*wr_base;
 	void __iomem		*intr;
 	void __iomem		*cnfg;
 	raw_spinlock_t		lock;
@@ -129,17 +135,54 @@ struct spmi_pmic_arb_dev {
 	struct irq_domain	*domain;
 	struct spmi_controller	*spmic;
 	u16			apid_to_ppid[256];
+	const struct pmic_arb_ver_ops *ver_ops;
+	u8			*ppid_to_chan;
+};
+
+/**
+ * pmic_arb_ver: version dependent functionality.
+ *
+ * @non_data_cmd:	on v1 issues an spmi non-data command.
+ *			on v2 no HW support, returns -EOPNOTSUPP.
+ * @offset:		on v1 offset of per-ee channel.
+ *			on v2 offset of per-ee and per-ppid channel.
+ * @fmt_cmd:		formats a GENI/SPMI command.
+ * @owner_acc_status:	on v1 offset of PMIC_ARB_SPMI_PIC_OWNERm_ACC_STATUSn
+ *			on v2 offset of SPMI_PIC_OWNERm_ACC_STATUSn.
+ * @acc_enable:		on v1 offset of PMIC_ARB_SPMI_PIC_ACC_ENABLEn
+ *			on v2 offset of SPMI_PIC_ACC_ENABLEn.
+ * @irq_status:		on v1 offset of PMIC_ARB_SPMI_PIC_IRQ_STATUSn
+ *			on v2 offset of SPMI_PIC_IRQ_STATUSn.
+ * @irq_clear:		on v1 offset of PMIC_ARB_SPMI_PIC_IRQ_CLEARn
+ *			on v2 offset of SPMI_PIC_IRQ_CLEARn.
+ */
+struct pmic_arb_ver_ops {
+	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
+	u32 (*offset)(struct spmi_pmic_arb_dev *dev, u8 sid, u16 addr);
+	u32 (*fmt_cmd)(u8 opc, u8 sid, u16 addr, u8 bc);
+	int (*non_data_cmd)(struct spmi_controller *ctrl, u8 opc, u8 sid);
+	/* Interrupts controller functionality (offset of PIC registers) */
+	u32 (*owner_acc_status)(u8 m, u8 n);
+	u32 (*acc_enable)(u8 n);
+	u32 (*irq_status)(u8 n);
+	u32 (*irq_clear)(u8 n);
 };
 
 static inline u32 pmic_arb_base_read(struct spmi_pmic_arb_dev *dev, u32 offset)
 {
-	return readl_relaxed(dev->base + offset);
+	return readl_relaxed(dev->rd_base + offset);
 }
 
 static inline void pmic_arb_base_write(struct spmi_pmic_arb_dev *dev,
 				       u32 offset, u32 val)
 {
-	writel_relaxed(val, dev->base + offset);
+	writel_relaxed(val, dev->wr_base + offset);
+}
+
+static inline void pmic_arb_set_rd_cmd(struct spmi_pmic_arb_dev *dev,
+				       u32 offset, u32 val)
+{
+	writel_relaxed(val, dev->rd_base + offset);
 }
 
 /**
@@ -168,15 +211,16 @@ pa_write_data(struct spmi_pmic_arb_dev *dev, const u8 *buf, u32 reg, u8 bc)
 	pmic_arb_base_write(dev, reg, data);
 }
 
-static int pmic_arb_wait_for_done(struct spmi_controller *ctrl)
+static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
+				  void __iomem *base, u8 sid, u16 addr)
 {
 	struct spmi_pmic_arb_dev *dev = spmi_controller_get_drvdata(ctrl);
 	u32 status = 0;
 	u32 timeout = PMIC_ARB_TIMEOUT_US;
-	u32 offset = PMIC_ARB_STATUS(dev->channel);
+	u32 offset = dev->ver_ops->offset(dev, sid, addr) + PMIC_ARB_STATUS;
 
 	while (timeout--) {
-		status = pmic_arb_base_read(dev, offset);
+		status = readl_relaxed(base + offset);
 
 		if (status & PMIC_ARB_STATUS_DONE) {
 			if (status & PMIC_ARB_STATUS_DENIED) {
@@ -211,28 +255,45 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl)
 	return -ETIMEDOUT;
 }
 
-/* Non-data command */
-static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
+static int
+pmic_arb_non_data_cmd_v1(struct spmi_controller *ctrl, u8 opc, u8 sid)
 {
 	struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
 	unsigned long flags;
 	u32 cmd;
 	int rc;
-
-	/* Check for valid non-data command */
-	if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP)
-		return -EINVAL;
+	u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, 0);
 
 	cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20);
 
 	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
-	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
-	rc = pmic_arb_wait_for_done(ctrl);
+	pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
+	rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, 0);
 	raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
 
 	return rc;
 }
 
+static int
+pmic_arb_non_data_cmd_v2(struct spmi_controller *ctrl, u8 opc, u8 sid)
+{
+	return -EOPNOTSUPP;
+}
+
+/* Non-data command */
+static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid)
+{
+	struct spmi_pmic_arb_dev *pmic_arb = spmi_controller_get_drvdata(ctrl);
+
+	dev_dbg(&ctrl->dev, "cmd op:0x%x sid:%d\n", opc, sid);
+
+	/* Check for valid non-data command */
+	if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP)
+		return -EINVAL;
+
+	return pmic_arb->ver_ops->non_data_cmd(ctrl, opc, sid);
+}
+
 static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 			     u16 addr, u8 *buf, size_t len)
 {
@@ -241,10 +302,11 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	u8 bc = len - 1;
 	u32 cmd;
 	int rc;
+	u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
 
 	if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
 		dev_err(&ctrl->dev,
-			"pmic-arb supports 1..%d bytes per trans, but %d requested",
+			"pmic-arb supports 1..%d bytes per trans, but:%zu requested",
 			PMIC_ARB_MAX_TRANS_BYTES, len);
 		return  -EINVAL;
 	}
@@ -259,20 +321,20 @@ static int pmic_arb_read_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	else
 		return -EINVAL;
 
-	cmd = (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
+	cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc);
 
 	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
-	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
-	rc = pmic_arb_wait_for_done(ctrl);
+	pmic_arb_set_rd_cmd(pmic_arb, offset + PMIC_ARB_CMD, cmd);
+	rc = pmic_arb_wait_for_done(ctrl, pmic_arb->rd_base, sid, addr);
 	if (rc)
 		goto done;
 
-	pa_read_data(pmic_arb, buf, PMIC_ARB_RDATA0(pmic_arb->channel),
+	pa_read_data(pmic_arb, buf, offset + PMIC_ARB_RDATA0,
 		     min_t(u8, bc, 3));
 
 	if (bc > 3)
 		pa_read_data(pmic_arb, buf + 4,
-				PMIC_ARB_RDATA1(pmic_arb->channel), bc - 4);
+				offset + PMIC_ARB_RDATA1, bc - 4);
 
 done:
 	raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
@@ -287,10 +349,11 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	u8 bc = len - 1;
 	u32 cmd;
 	int rc;
+	u32 offset = pmic_arb->ver_ops->offset(pmic_arb, sid, addr);
 
 	if (bc >= PMIC_ARB_MAX_TRANS_BYTES) {
 		dev_err(&ctrl->dev,
-			"pmic-arb supports 1..%d bytes per trans, but:%d requested",
+			"pmic-arb supports 1..%d bytes per trans, but:%zu requested",
 			PMIC_ARB_MAX_TRANS_BYTES, len);
 		return  -EINVAL;
 	}
@@ -307,19 +370,19 @@ static int pmic_arb_write_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid,
 	else
 		return -EINVAL;
 
-	cmd = (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
+	cmd = pmic_arb->ver_ops->fmt_cmd(opc, sid, addr, bc);
 
 	/* Write data to FIFOs */
 	raw_spin_lock_irqsave(&pmic_arb->lock, flags);
-	pa_write_data(pmic_arb, buf, PMIC_ARB_WDATA0(pmic_arb->channel)
-							, min_t(u8, bc, 3));
+	pa_write_data(pmic_arb, buf, offset + PMIC_ARB_WDATA0,
+		      min_t(u8, bc, 3));
 	if (bc > 3)
 		pa_write_data(pmic_arb, buf + 4,
-				PMIC_ARB_WDATA1(pmic_arb->channel), bc - 4);
+				offset + PMIC_ARB_WDATA1, bc - 4);
 
 	/* Start the transaction */
-	pmic_arb_base_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd);
-	rc = pmic_arb_wait_for_done(ctrl);
+	pmic_arb_base_write(pmic_arb, offset + PMIC_ARB_CMD, cmd);
+	rc = pmic_arb_wait_for_done(ctrl, pmic_arb->wr_base, sid, addr);
 	raw_spin_unlock_irqrestore(&pmic_arb->lock, flags);
 
 	return rc;
@@ -376,7 +439,7 @@ static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid)
 	u32 status;
 	int id;
 
-	status = readl_relaxed(pa->intr + SPMI_PIC_IRQ_STATUS(apid));
+	status = readl_relaxed(pa->intr + pa->ver_ops->irq_status(apid));
 	while (status) {
 		id = ffs(status) - 1;
 		status &= ~(1 << id);
@@ -402,7 +465,7 @@ static void pmic_arb_chained_irq(unsigned int irq, struct irq_desc *desc)
 
 	for (i = first; i <= last; ++i) {
 		status = readl_relaxed(intr +
-				       SPMI_PIC_OWNER_ACC_STATUS(pa->ee, i));
+				      pa->ver_ops->owner_acc_status(pa->ee, i));
 		while (status) {
 			id = ffs(status) - 1;
 			status &= ~(1 << id);
@@ -422,7 +485,7 @@ static void qpnpint_irq_ack(struct irq_data *d)
 	u8 data;
 
 	raw_spin_lock_irqsave(&pa->lock, flags);
-	writel_relaxed(1 << irq, pa->intr + SPMI_PIC_IRQ_CLEAR(apid));
+	writel_relaxed(1 << irq, pa->intr + pa->ver_ops->irq_clear(apid));
 	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
 	data = 1 << irq;
@@ -439,10 +502,11 @@ static void qpnpint_irq_mask(struct irq_data *d)
 	u8 data;
 
 	raw_spin_lock_irqsave(&pa->lock, flags);
-	status = readl_relaxed(pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+	status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
 	if (status & SPMI_PIC_ACC_ENABLE_BIT) {
 		status = status & ~SPMI_PIC_ACC_ENABLE_BIT;
-		writel_relaxed(status, pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+		writel_relaxed(status, pa->intr +
+			       pa->ver_ops->acc_enable(apid));
 	}
 	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
@@ -460,10 +524,10 @@ static void qpnpint_irq_unmask(struct irq_data *d)
 	u8 data;
 
 	raw_spin_lock_irqsave(&pa->lock, flags);
-	status = readl_relaxed(pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+	status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
 	if (!(status & SPMI_PIC_ACC_ENABLE_BIT)) {
 		writel_relaxed(status | SPMI_PIC_ACC_ENABLE_BIT,
-				pa->intr + SPMI_PIC_ACC_ENABLE(apid));
+				pa->intr + pa->ver_ops->acc_enable(apid));
 	}
 	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
@@ -624,6 +688,91 @@ static int qpnpint_irq_domain_map(struct irq_domain *d,
 	return 0;
 }
 
+/* v1 offset per ee */
+static u32 pmic_arb_offset_v1(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr)
+{
+	return 0x800 + 0x80 * pa->channel;
+}
+
+/* v2 offset per ppid (chan) and per ee */
+static u32 pmic_arb_offset_v2(struct spmi_pmic_arb_dev *pa, u8 sid, u16 addr)
+{
+	u16 ppid = (sid << 8) | (addr >> 8);
+	u8  chan = pa->ppid_to_chan[ppid];
+
+	return 0x1000 * pa->ee + 0x8000 * chan;
+}
+
+static u32 pmic_arb_fmt_cmd_v1(u8 opc, u8 sid, u16 addr, u8 bc)
+{
+	return (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7);
+}
+
+static u32 pmic_arb_fmt_cmd_v2(u8 opc, u8 sid, u16 addr, u8 bc)
+{
+	return (opc << 27) | ((addr & 0xff) << 4) | (bc & 0x7);
+}
+
+static u32 pmic_arb_owner_acc_status_v1(u8 m, u8 n)
+{
+	return 0x20 * m + 0x4 * n;
+}
+
+static u32 pmic_arb_owner_acc_status_v2(u8 m, u8 n)
+{
+	return 0x100000 + 0x1000 * m + 0x4 * n;
+}
+
+static u32 pmic_arb_acc_enable_v1(u8 n)
+{
+	return 0x200 + 0x4 * n;
+}
+
+static u32 pmic_arb_acc_enable_v2(u8 n)
+{
+	return 0x1000 * n;
+}
+
+static u32 pmic_arb_irq_status_v1(u8 n)
+{
+	return 0x600 + 0x4 * n;
+}
+
+static u32 pmic_arb_irq_status_v2(u8 n)
+{
+	return 0x4 + 0x1000 * n;
+}
+
+static u32 pmic_arb_irq_clear_v1(u8 n)
+{
+	return 0xA00 + 0x4 * n;
+}
+
+static u32 pmic_arb_irq_clear_v2(u8 n)
+{
+	return 0x8 + 0x1000 * n;
+}
+
+static const struct pmic_arb_ver_ops pmic_arb_v1 = {
+	.non_data_cmd		= pmic_arb_non_data_cmd_v1,
+	.offset			= pmic_arb_offset_v1,
+	.fmt_cmd		= pmic_arb_fmt_cmd_v1,
+	.owner_acc_status	= pmic_arb_owner_acc_status_v1,
+	.acc_enable		= pmic_arb_acc_enable_v1,
+	.irq_status		= pmic_arb_irq_status_v1,
+	.irq_clear		= pmic_arb_irq_clear_v1,
+};
+
+static const struct pmic_arb_ver_ops pmic_arb_v2 = {
+	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
+	.offset			= pmic_arb_offset_v2,
+	.fmt_cmd		= pmic_arb_fmt_cmd_v2,
+	.owner_acc_status	= pmic_arb_owner_acc_status_v2,
+	.acc_enable		= pmic_arb_acc_enable_v2,
+	.irq_status		= pmic_arb_irq_status_v2,
+	.irq_clear		= pmic_arb_irq_clear_v2,
+};
+
 static const struct irq_domain_ops pmic_arb_irq_domain_ops = {
 	.map	= qpnpint_irq_domain_map,
 	.xlate	= qpnpint_irq_domain_dt_translate,
@@ -634,8 +783,10 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	struct spmi_pmic_arb_dev *pa;
 	struct spmi_controller *ctrl;
 	struct resource *res;
-	u32 channel, ee;
+	void __iomem *core;
+	u32 channel, ee, hw_ver;
 	int err, i;
+	bool is_v1;
 
 	ctrl = spmi_controller_alloc(&pdev->dev, sizeof(*pa));
 	if (!ctrl)
@@ -645,12 +796,65 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	pa->spmic = ctrl;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
-	pa->base = devm_ioremap_resource(&ctrl->dev, res);
-	if (IS_ERR(pa->base)) {
-		err = PTR_ERR(pa->base);
+	core = devm_ioremap_resource(&ctrl->dev, res);
+	if (IS_ERR(core)) {
+		err = PTR_ERR(core);
 		goto err_put_ctrl;
 	}
 
+	hw_ver = readl_relaxed(core + PMIC_ARB_VERSION);
+	is_v1  = (hw_ver < PMIC_ARB_VERSION_V2_MIN);
+
+	dev_info(&ctrl->dev, "PMIC Arb Version-%d (0x%x)\n", (is_v1 ? 1 : 2),
+		hw_ver);
+
+	if (is_v1) {
+		pa->ver_ops = &pmic_arb_v1;
+		pa->wr_base = core;
+		pa->rd_base = core;
+	} else {
+		u8  chan;
+		u16 ppid;
+		u32 regval;
+
+		pa->ver_ops = &pmic_arb_v2;
+
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						   "obsrvr");
+		pa->rd_base = devm_ioremap_resource(&ctrl->dev, res);
+		if (IS_ERR(pa->rd_base)) {
+			err = PTR_ERR(pa->rd_base);
+			goto err_put_ctrl;
+		}
+
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						   "chnls");
+		pa->wr_base = devm_ioremap_resource(&ctrl->dev, res);
+		if (IS_ERR(pa->wr_base)) {
+			err = PTR_ERR(pa->wr_base);
+			goto err_put_ctrl;
+		}
+
+		pa->ppid_to_chan = devm_kzalloc(&ctrl->dev,
+					PPID_TO_CHAN_TABLE_SZ, GFP_KERNEL);
+		if (!pa->ppid_to_chan) {
+			err = -ENOMEM;
+			goto err_put_ctrl;
+		}
+		/*
+		 * PMIC_ARB_REG_CHNL is a table in HW mapping channel to ppid.
+		 * ppid_to_chan is an in-memory invert of that table.
+		 */
+		for (chan = 0; chan < PMIC_ARB_MAX_CHNL; ++chan) {
+			regval = readl_relaxed(core + PMIC_ARB_REG_CHNL(chan));
+			if (!regval)
+				continue;
+
+			ppid = (regval >> 8) & 0xFFF;
+			pa->ppid_to_chan[ppid] = chan;
+		}
+	}
+
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr");
 	pa->intr = devm_ioremap_resource(&ctrl->dev, res);
 	if (IS_ERR(pa->intr)) {
@@ -731,9 +935,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 	if (err)
 		goto err_domain_remove;
 
-	dev_dbg(&ctrl->dev, "PMIC Arb Version 0x%x\n",
-		pmic_arb_base_read(pa, PMIC_ARB_VERSION));
-
 	return 0;
 
 err_domain_remove:
diff --git a/drivers/spmi/spmi.c b/drivers/spmi/spmi.c
index 1d92f5103ebf..94938436aef9 100644
--- a/drivers/spmi/spmi.c
+++ b/drivers/spmi/spmi.c
@@ -1,4 +1,5 @@
-/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+/*
+ * Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -316,11 +317,6 @@ static int spmi_drv_probe(struct device *dev)
 	struct spmi_device *sdev = to_spmi_device(dev);
 	int err;
 
-	/* Ensure the slave is in ACTIVE state */
-	err = spmi_command_wakeup(sdev);
-	if (err)
-		goto fail_wakeup;
-
 	pm_runtime_get_noresume(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
@@ -335,7 +331,6 @@ fail_probe:
 	pm_runtime_disable(dev);
 	pm_runtime_set_suspended(dev);
 	pm_runtime_put_noidle(dev);
-fail_wakeup:
 	return err;
 }
 
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 6276f13e9e12..65bf0676d54a 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -835,7 +835,15 @@ int __uio_register_device(struct module *owner,
 	info->uio_dev = idev;
 
 	if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
-		ret = devm_request_irq(idev->dev, info->irq, uio_interrupt,
+		/*
+		 * Note that we deliberately don't use devm_request_irq
+		 * here. The parent module can unregister the UIO device
+		 * and call pci_disable_msi, which requires that this
+		 * irq has been freed. However, the device may have open
+		 * FDs at the time of unregister and therefore may not be
+		 * freed until they are released.
+		 */
+		ret = request_irq(info->irq, uio_interrupt,
 				  info->irq_flags, info->name, idev);
 		if (ret)
 			goto err_request_irq;
@@ -871,6 +879,8 @@ void uio_unregister_device(struct uio_info *info)
 
 	uio_dev_del_attributes(idev);
 
+	free_irq(idev->info->irq, idev);
+
 	device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
 
 	return;
diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c
index 53bf2c860ad3..a4621757a47f 100644
--- a/drivers/w1/masters/mxc_w1.c
+++ b/drivers/w1/masters/mxc_w1.c
@@ -166,7 +166,7 @@ static int mxc_w1_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct of_device_id mxc_w1_dt_ids[] = {
+static const struct of_device_id mxc_w1_dt_ids[] = {
 	{ .compatible = "fsl,imx21-owire" },
 	{ /* sentinel */ }
 };
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 03321d6a2684..e7d448963a24 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -72,7 +72,7 @@ struct hdq_data {
 static int omap_hdq_probe(struct platform_device *pdev);
 static int omap_hdq_remove(struct platform_device *pdev);
 
-static struct of_device_id omap_hdq_dt_ids[] = {
+static const struct of_device_id omap_hdq_dt_ids[] = {
 	{ .compatible = "ti,omap3-1w" },
 	{}
 };
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index b99a932ad901..8f7848c62811 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -68,7 +68,7 @@ static u8 w1_gpio_read_bit(void *data)
 }
 
 #if defined(CONFIG_OF)
-static struct of_device_id w1_gpio_dt_ids[] = {
+static const struct of_device_id w1_gpio_dt_ids[] = {
 	{ .compatible = "w1-gpio" },
 	{}
 };