mtd: introduce mtd_read interface

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
index ffdf4fc..c59d642 100644
--- a/fs/jffs2/erase.c
+++ b/fs/jffs2/erase.c
@@ -381,7 +381,7 @@
 
 		*bad_offset = ofs;
 
-		ret = c->mtd->read(c->mtd, ofs, readlen, &retlen, ebuf);
+		ret = mtd_read(c->mtd, ofs, readlen, &retlen, ebuf);
 		if (ret) {
 			printk(KERN_WARNING "Read of newly-erased block at 0x%08x failed: %d. Putting on bad_list\n", ofs, ret);
 			ret = -EIO;
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index b09e51d..a24d3d2 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -228,7 +228,7 @@
 	size_t retlen;
 	char *eccstr;
 
-	ret = c->mtd->read(c->mtd, ofs, c->wbuf_pagesize, &retlen, c->wbuf_verify);
+	ret = mtd_read(c->mtd, ofs, c->wbuf_pagesize, &retlen, c->wbuf_verify);
 	if (ret && ret != -EUCLEAN && ret != -EBADMSG) {
 		printk(KERN_WARNING "jffs2_verify_write(): Read back of page at %08x failed: %d\n", c->wbuf_ofs, ret);
 		return ret;
@@ -337,7 +337,8 @@
 		}
 
 		/* Do the read... */
-		ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
+		ret = mtd_read(c->mtd, start, c->wbuf_ofs - start, &retlen,
+			       buf);
 
 		/* ECC recovered ? */
 		if ((ret == -EUCLEAN || ret == -EBADMSG) &&
@@ -948,11 +949,11 @@
 	int	ret;
 
 	if (!jffs2_is_writebuffered(c))
-		return c->mtd->read(c->mtd, ofs, len, retlen, buf);
+		return mtd_read(c->mtd, ofs, len, retlen, buf);
 
 	/* Read flash */
 	down_read(&c->wbuf_sem);
-	ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
+	ret = mtd_read(c->mtd, ofs, len, retlen, buf);
 
 	if ( (ret == -EBADMSG || ret == -EUCLEAN) && (*retlen == len) ) {
 		if (ret == -EBADMSG)
diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
index 0463628..3ee6435 100644
--- a/fs/logfs/dev_mtd.c
+++ b/fs/logfs/dev_mtd.c
@@ -20,7 +20,7 @@
 	size_t retlen;
 	int ret;
 
-	ret = mtd->read(mtd, ofs, len, &retlen, buf);
+	ret = mtd_read(mtd, ofs, len, &retlen, buf);
 	BUG_ON(ret == -EINVAL);
 	if (ret)
 		return ret;