Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6: (97 commits)
  mtd: kill CONFIG_MTD_PARTITIONS
  mtd: remove add_mtd_partitions, add_mtd_device and friends
  mtd: convert remaining users to mtd_device_register()
  mtd: samsung onenand: convert to mtd_device_register()
  mtd: omap2 onenand: convert to mtd_device_register()
  mtd: txx9ndfmc: convert to mtd_device_register()
  mtd: tmio_nand: convert to mtd_device_register()
  mtd: socrates_nand: convert to mtd_device_register()
  mtd: sharpsl: convert to mtd_device_register()
  mtd: s3c2410 nand: convert to mtd_device_register()
  mtd: ppchameleonevb: convert to mtd_device_register()
  mtd: orion_nand: convert to mtd_device_register()
  mtd: omap2: convert to mtd_device_register()
  mtd: nomadik_nand: convert to mtd_device_register()
  mtd: ndfc: convert to mtd_device_register()
  mtd: mxc_nand: convert to mtd_device_register()
  mtd: mpc5121_nfc: convert to mtd_device_register()
  mtd: jz4740_nand: convert to mtd_device_register()
  mtd: h1910: convert to mtd_device_register()
  mtd: fsmc_nand: convert to mtd_device_register()
  ...

Fixed up trivial conflicts in
 - drivers/mtd/maps/integrator-flash.c: removed in ARM tree
 - drivers/mtd/maps/physmap.c: addition of afs partition probe type
   clashing with removal of CONFIG_MTD_PARTITIONS

1 files changed, 23 insertions, 32 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 4c36ef66a46b..3f92731a5b9e 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -166,10 +166,23 @@ static int mtd_close(struct inode *inode, struct file *file)
 	return 0;
 } /* mtd_close */
 
-/* FIXME: This _really_ needs to die. In 2.5, we should lock the
-   userspace buffer down and use it directly with readv/writev.
-*/
-#define MAX_KMALLOC_SIZE 0x20000
+/* Back in June 2001, dwmw2 wrote:
+ *
+ *   FIXME: This _really_ needs to die. In 2.5, we should lock the
+ *   userspace buffer down and use it directly with readv/writev.
+ *
+ * The implementation below, using mtd_kmalloc_up_to, mitigates
+ * allocation failures when the system is under low-memory situations
+ * or if memory is highly fragmented at the cost of reducing the
+ * performance of the requested transfer due to a smaller buffer size.
+ *
+ * A more complex but more memory-efficient implementation based on
+ * get_user_pages and iovecs to cover extents of those pages is a
+ * longer-term goal, as intimated by dwmw2 above. However, for the
+ * write case, this requires yet more complex head and tail transfer
+ * handling when those head and tail offsets and sizes are such that
+ * alignment requirements are not met in the NAND subdriver.
+ */
 
 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 {
@@ -179,6 +192,7 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
 	size_t total_retlen=0;
 	int ret=0;
 	int len;
+	size_t size = count;
 	char *kbuf;
 
 	DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
@@ -189,23 +203,12 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
 	if (!count)
 		return 0;
 
-	/* FIXME: Use kiovec in 2.5 to lock down the user's buffers
-	   and pass them directly to the MTD functions */
-
-	if (count > MAX_KMALLOC_SIZE)
-		kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
-	else
-		kbuf=kmalloc(count, GFP_KERNEL);
-
+	kbuf = mtd_kmalloc_up_to(mtd, &size);
 	if (!kbuf)
 		return -ENOMEM;
 
 	while (count) {
-
-		if (count > MAX_KMALLOC_SIZE)
-			len = MAX_KMALLOC_SIZE;
-		else
-			len = count;
+		len = min_t(size_t, count, size);
 
 		switch (mfi->mode) {
 		case MTD_MODE_OTP_FACTORY:
@@ -268,6 +271,7 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count
 {
 	struct mtd_file_info *mfi = file->private_data;
 	struct mtd_info *mtd = mfi->mtd;
+	size_t size = count;
 	char *kbuf;
 	size_t retlen;
 	size_t total_retlen=0;
@@ -285,20 +289,12 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count
 	if (!count)
 		return 0;
 
-	if (count > MAX_KMALLOC_SIZE)
-		kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
-	else
-		kbuf=kmalloc(count, GFP_KERNEL);
-
+	kbuf = mtd_kmalloc_up_to(mtd, &size);
 	if (!kbuf)
 		return -ENOMEM;
 
 	while (count) {
-
-		if (count > MAX_KMALLOC_SIZE)
-			len = MAX_KMALLOC_SIZE;
-		else
-			len = count;
+		len = min_t(size_t, count, size);
 
 		if (copy_from_user(kbuf, buf, len)) {
 			kfree(kbuf);
@@ -512,7 +508,6 @@ static int shrink_ecclayout(const struct nand_ecclayout *from,
 	return 0;
 }
 
-#ifdef CONFIG_MTD_PARTITIONS
 static int mtd_blkpg_ioctl(struct mtd_info *mtd,
 			   struct blkpg_ioctl_arg __user *arg)
 {
@@ -548,8 +543,6 @@ static int mtd_blkpg_ioctl(struct mtd_info *mtd,
 		return -EINVAL;
 	}
 }
-#endif
-
 
 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
 {
@@ -941,7 +934,6 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
 		break;
 	}
 
-#ifdef CONFIG_MTD_PARTITIONS
 	case BLKPG:
 	{
 		ret = mtd_blkpg_ioctl(mtd,
@@ -955,7 +947,6 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
 		ret = 0;
 		break;
 	}
-#endif
 
 	default:
 		ret = -ENOTTY;