From: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Date: Mon, 30 Oct 2006 21:23:45 +0000 (-0500)
Subject: [PATCH] fix bd_claim_by_kobject error handling
X-Git-Tag: firefly_0821_release~31522^2~20^2~306
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bcb55165d3d1ae3ec95807d118fd6d5956cd127b;p=firefly-linux-kernel-4.4.55.git

[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>
---

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);