6 files changed, 35 insertions, 6 deletions

diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index b4a0b2b99a78..6b4ef1d38fb2 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -215,6 +215,7 @@
  * @disable_int: function to disable all interrupts
  * @init: function to initialize the I2C hardware
  * @mode: operation mode - DW_IC_MASTER or DW_IC_SLAVE
+ * @suspended: set to true if the controller is suspended
  *
  * HCNT and LCNT parameters can be used if the platform knows more accurate
  * values than the one computed based only on the input clock frequency.
@@ -270,6 +271,7 @@ struct dw_i2c_dev {
 	int			(*set_sda_hold_time)(struct dw_i2c_dev *dev);
 	int			mode;
 	struct i2c_bus_recovery_info rinfo;
+	bool			suspended;
 };
 
 #define ACCESS_SWAP		0x00000001
diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 8d1bc44d2530..bb8e3f149979 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -426,6 +426,12 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
 	pm_runtime_get_sync(dev->dev);
 
+	if (dev->suspended) {
+		dev_err(dev->dev, "Error %s call while suspended\n", __func__);
+		ret = -ESHUTDOWN;
+		goto done_nolock;
+	}
+
 	reinit_completion(&dev->cmd_complete);
 	dev->msgs = msgs;
 	dev->msgs_num = num;
diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index d50f80487214..76810deb2de6 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -176,6 +176,7 @@ static int i2c_dw_pci_suspend(struct device *dev)
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
 
+	i_dev->suspended = true;
 	i_dev->disable(i_dev);
 
 	return 0;
@@ -185,8 +186,12 @@ static int i2c_dw_pci_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
+	int ret;
 
-	return i_dev->init(i_dev);
+	ret = i_dev->init(i_dev);
+	i_dev->suspended = false;
+
+	return ret;
 }
 #endif
 
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 9eaac3be1f63..ead5e7de3e4d 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -454,6 +454,8 @@ static int dw_i2c_plat_suspend(struct device *dev)
 {
 	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
 
+	i_dev->suspended = true;
+
 	if (i_dev->shared_with_punit)
 		return 0;
 
@@ -471,6 +473,7 @@ static int dw_i2c_plat_resume(struct device *dev)
 		i2c_dw_prepare_clk(i_dev, true);
 
 	i_dev->init(i_dev);
+	i_dev->suspended = false;
 
 	return 0;
 }
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 28460f6a60cc..af87a16ac3a5 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -430,7 +430,7 @@ static int i2c_device_remove(struct device *dev)
 	dev_pm_clear_wake_irq(&client->dev);
 	device_init_wakeup(&client->dev, false);
 
-	client->irq = 0;
+	client->irq = client->init_irq;
 
 	return status;
 }
@@ -741,10 +741,11 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
 	client->flags = info->flags;
 	client->addr = info->addr;
 
-	client->irq = info->irq;
-	if (!client->irq)
-		client->irq = i2c_dev_irq_from_resources(info->resources,
+	client->init_irq = info->irq;
+	if (!client->init_irq)
+		client->init_irq = i2c_dev_irq_from_resources(info->resources,
 							 info->num_resources);
+	client->irq = client->init_irq;
 
 	strlcpy(client->name, info->type, sizeof(client->name));
 
diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
index 6cb7ad608bcd..0f01cdba9d2c 100644
--- a/drivers/i2c/i2c-core-of.c
+++ b/drivers/i2c/i2c-core-of.c
@@ -121,6 +121,17 @@ static int of_dev_node_match(struct device *dev, void *data)
 	return dev->of_node == data;
 }
 
+static int of_dev_or_parent_node_match(struct device *dev, void *data)
+{
+	if (dev->of_node == data)
+		return 1;
+
+	if (dev->parent)
+		return dev->parent->of_node == data;
+
+	return 0;
+}
+
 /* must call put_device() when done with returned i2c_client device */
 struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
 {
@@ -145,7 +156,8 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
 	struct device *dev;
 	struct i2c_adapter *adapter;
 
-	dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match);
+	dev = bus_find_device(&i2c_bus_type, NULL, node,
+			      of_dev_or_parent_node_match);
 	if (!dev)
 		return NULL;