mtd: add leading underscore to all mtd functions

This patch renames all MTD functions by adding a "_" prefix:

mtd->erase -> mtd->_erase
mtd->read_oob -> mtd->_read_oob
...

The reason is that we are re-working the MTD API and from now on it is
an error to use MTD function pointers directly - we have a corresponding
API call for every pointer. By adding a leading "_" we achieve the following:

1. Make sure we convert every direct pointer users
2. A leading "_" suggests that this interface is internal and it becomes
   less likely that people will use them directly
3. Make sure all the out-of-tree modules stop compiling and the owners
   spot the big API change and amend them.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 1ed5103..5c7eb69 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -777,16 +777,16 @@
 	concat->mtd.subpage_sft = subdev[0]->subpage_sft;
 	concat->mtd.oobsize = subdev[0]->oobsize;
 	concat->mtd.oobavail = subdev[0]->oobavail;
-	if (subdev[0]->writev)
-		concat->mtd.writev = concat_writev;
-	if (subdev[0]->read_oob)
-		concat->mtd.read_oob = concat_read_oob;
-	if (subdev[0]->write_oob)
-		concat->mtd.write_oob = concat_write_oob;
-	if (subdev[0]->block_isbad)
-		concat->mtd.block_isbad = concat_block_isbad;
-	if (subdev[0]->block_markbad)
-		concat->mtd.block_markbad = concat_block_markbad;
+	if (subdev[0]->_writev)
+		concat->mtd._writev = concat_writev;
+	if (subdev[0]->_read_oob)
+		concat->mtd._read_oob = concat_read_oob;
+	if (subdev[0]->_write_oob)
+		concat->mtd._write_oob = concat_write_oob;
+	if (subdev[0]->_block_isbad)
+		concat->mtd._block_isbad = concat_block_isbad;
+	if (subdev[0]->_block_markbad)
+		concat->mtd._block_markbad = concat_block_markbad;
 
 	concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;
 
@@ -833,8 +833,8 @@
 		if (concat->mtd.writesize   !=  subdev[i]->writesize ||
 		    concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
 		    concat->mtd.oobsize    !=  subdev[i]->oobsize ||
-		    !concat->mtd.read_oob  != !subdev[i]->read_oob ||
-		    !concat->mtd.write_oob != !subdev[i]->write_oob) {
+		    !concat->mtd._read_oob  != !subdev[i]->_read_oob ||
+		    !concat->mtd._write_oob != !subdev[i]->_write_oob) {
 			kfree(concat);
 			printk("Incompatible OOB or ECC data on \"%s\"\n",
 			       subdev[i]->name);
@@ -849,15 +849,15 @@
 	concat->num_subdev = num_devs;
 	concat->mtd.name = name;
 
-	concat->mtd.erase = concat_erase;
-	concat->mtd.read = concat_read;
-	concat->mtd.write = concat_write;
-	concat->mtd.sync = concat_sync;
-	concat->mtd.lock = concat_lock;
-	concat->mtd.unlock = concat_unlock;
-	concat->mtd.suspend = concat_suspend;
-	concat->mtd.resume = concat_resume;
-	concat->mtd.get_unmapped_area = concat_get_unmapped_area;
+	concat->mtd._erase = concat_erase;
+	concat->mtd._read = concat_read;
+	concat->mtd._write = concat_write;
+	concat->mtd._sync = concat_sync;
+	concat->mtd._lock = concat_lock;
+	concat->mtd._unlock = concat_unlock;
+	concat->mtd._suspend = concat_suspend;
+	concat->mtd._resume = concat_resume;
+	concat->mtd._get_unmapped_area = concat_get_unmapped_area;
 
 	/*
 	 * Combine the erase block size info of the subdevices: