MTD: Fix wrong check register_blkdev return value

register_blkdev return 1..255 when major = 0.

if (ret ) {
	printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
		tr->name, tr->major, ret);
	      mutex_unlock(&mtd_table_mutex);
	return ret;
}

Above code will return fail when register_blkdev return allocated major number.

Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index a919587ed481..63790e975d20 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -502,13 +502,16 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
         mutex_lock(&mtd_table_mutex);
 
         ret = register_blkdev(tr->major, tr->name);
-        if (ret) {
+        if (ret < 0) {
                 printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n",
                        tr->name, tr->major, ret);
                 mutex_unlock(&mtd_table_mutex);
                 return ret;
         }
 
+        if (ret)
+                tr->major = ret;
+
         tr->blkshift = ffs(tr->blksize) - 1;
 
         INIT_LIST_HEAD(&tr->devs);