linux-kernel - [PATCH 4.4 066/342] bcache: unregister reboot notifier if bcache fails to unregister device

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Message-Id: <20160301234530.133753948@linuxfoundation.org>
Date:	Tue, 01 Mar 2016 23:54:06 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Zheng Liu <wenqing.lz@...bao.com>,
	Joshua Schmid <jschmid@...e.com>,
	Eric Wheeler <bcache@...ux.ewheeler.net>,
	Kent Overstreet <kmo@...erainc.com>, Jens Axboe <axboe@...com>
Subject: [PATCH 4.4 066/342] bcache: unregister reboot notifier if bcache fails to unregister device

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zheng Liu <wenqing.lz@...bao.com>

commit 2ecf0cdb2b437402110ab57546e02abfa68a716b upstream.

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@...bao.com>
Tested-by: Joshua Schmid <jschmid@...e.com>
Tested-by: Eric Wheeler <bcache@...ux.ewheeler.net>
Cc: Kent Overstreet <kmo@...erainc.com>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bcache/super.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2071,8 +2071,10 @@ 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)) ||