[PATCH] bcache: explicitly destory mutex while exiting

[Liang Chen <liangchen.linux@gmail.com>]

mutex_destroy does nothing most of time, but it's better to call
it to make the code future proof and it also has some meaning
for like mutex debug.

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
---
 drivers/md/bcache/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 85e3f21..406fe03 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2083,6 +2083,7 @@ static void bcache_exit(void)
 	if (bcache_major)
 		unregister_blkdev(bcache_major, "bcache");
 	unregister_reboot_notifier(&reboot);
+	mutex_destroy(&bch_register_lock);
 }
 
 static int __init bcache_init(void)
@@ -2100,6 +2101,7 @@ static int __init bcache_init(void)
 
 	bcache_major = register_blkdev(0, "bcache");
 	if (bcache_major < 0) {
+		mutex_destroy(&bch_register_lock);
 		unregister_reboot_notifier(&reboot);
 		return bcache_major;
 	}
-- 
1.8.3.1