[Devel] [PATCH 3/4] bcache: unregister reboot notifier if bcache fails to unregister device

[Andrey Ryabinin]

From: Zheng Liu <wenqing.lz at taobao.com>

In bcache_init() function it forgot to unregister reboot notifier if
bcache fails to unregister a block device.  This commit fixes this.

Signed-off-by: Zheng Liu <wenqing.lz at taobao.com>
Tested-by: Joshua Schmid <jschmid at suse.com>
Tested-by: Eric Wheeler <bcache at linux.ewheeler.net>
Cc: Kent Overstreet <kmo at daterainc.com>
Cc: stable at vger.kernel.org
Signed-off-by: Jens Axboe <axboe at fb.com>

https://jira.sw.ru/browse/PSBM-106785
(cherry picked from commit 2ecf0cdb2b437402110ab57546e02abfa68a716b)
Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
---
 drivers/md/bcache/super.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 0fccdc395ebe..88a008577dc0 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1959,8 +1959,10 @@ static int __init bcache_init(void)
 	closure_debug_init();
 
 	bcache_major = register_blkdev(0, "bcache");
-	if (bcache_major < 0)
+	if (bcache_major < 0) {
+		unregister_reboot_notifier(&reboot);
 		return bcache_major;
+	}
 
 	if (!(bcache_wq = create_workqueue("bcache")) ||
 	    !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) ||
-- 
2.26.2