[Devel] [PATCH RHEL7 COMMIT] ms/bcache: unregister reboot notifier if bcache fails to unregister device #PSBM-106785

[Vasily Averin]

The commit is pushed to "branch-rh7-3.10.0-1127.18.2.vz7.163.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1127.18.2.vz7.163.21
------>
commit 35f7558038e1a4c78638042f332029360e4f3493
Author: Zheng Liu <wenqing.lz at taobao.com>
Date:   Tue Sep 15 11:55:11 2020 +0300

    ms/bcache: unregister reboot notifier if bcache fails to unregister device #PSBM-106785
    
    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 0fccdc3..88a0085 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)) ||