bcache: explicitly destroy mutex while exiting

[ Upstream commit 330a4db89d39a6b43f36da16824eaa7a7509d34d ]

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.

As Coly pointed out in a previous review, bcache_exit() may not be
able to handle all the references properly if userspace registers
cache and backing devices right before bch_debug_init runs and
bch_debug_init failes later. So not exposing userspace interface
until everything is ready to avoid that issue.

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
Reviewed-by: Michael Lyle <mlyle@lyle.org>
Reviewed-by: Coly Li <colyli@suse.de>
Reviewed-by: Eric Wheeler <bcache@linux.ewheeler.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index b911a7d7a06b8fc048ced2a8218eb53394fecb38..6f7bc8a8674b90a5672f4d3a4b8e1b97557e25b9 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2122,6 +2122,7 @@ 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)
@@ -2140,14 +2141,15 @@ static int __init bcache_init(void)
        bcache_major = register_blkdev(0, "bcache");
        if (bcache_major < 0) {
                unregister_reboot_notifier(&reboot);
+               mutex_destroy(&bch_register_lock);
                return bcache_major;
        }
 
        if (!(bcache_wq = create_workqueue("bcache")) ||
            !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) ||
-           sysfs_create_files(bcache_kobj, files) ||
            bch_request_init() ||
-           bch_debug_init(bcache_kobj))
+           bch_debug_init(bcache_kobj) ||
+           sysfs_create_files(bcache_kobj, files))
                goto err;
 
        return 0;