[PATCH] fix bd_claim_by_kobject error handling

This fixes bd_claim_by_kobject to release bdev correctly in case that
bd_claim succeeds but following add_bd_holder fails.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 702b88cbd91d..b54b0a1b7c68 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -751,8 +751,11 @@ static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
 
         mutex_lock_nested(&bdev->bd_mutex, BD_MUTEX_PARTITION);
         res = bd_claim(bdev, holder);
-        if (res == 0)
+        if (res == 0) {
                 res = add_bd_holder(bdev, bo);
+                if (res)
+                        bd_release(bdev);
+        }
         if (res)
                 free_bd_holder(bo);
         mutex_unlock(&bdev->bd_mutex);