From: Zheng Liu <wenqing...@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...@taobao.com>
Tested-by: Joshua Schmid <jsch...@suse.com>
Tested-by: Eric Wheeler <bca...@linux.ewheeler.net>
Cc: Kent Overstreet <k...@daterainc.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Jens Axboe <ax...@fb.com>

https://jira.sw.ru/browse/PSBM-106785
(cherry picked from commit 2ecf0cdb2b437402110ab57546e02abfa68a716b)
Signed-off-by: Andrey Ryabinin <aryabi...@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

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