This is a note to let you know that I've just added the patch titled
bcache: explicitly destroy mutex while exiting
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcache-explicitly-destroy-mutex-while-exiting.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Dec 18 15:03:25 CET 2017
From: Liang Chen <liangchen.linux@xxxxxxxxx>
Date: Mon, 30 Oct 2017 14:46:35 -0700
Subject: bcache: explicitly destroy mutex while exiting
From: Liang Chen <liangchen.linux@xxxxxxxxx>
[ 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@xxxxxxxxx>
Reviewed-by: Michael Lyle <mlyle@xxxxxxxx>
Reviewed-by: Coly Li <colyli@xxxxxxx>
Reviewed-by: Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/super.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2120,6 +2120,7 @@ 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)
@@ -2138,14 +2139,15 @@ 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;
Patches currently in stable-queue which might be from liangchen.linux@xxxxxxxxx are
queue-3.18/bcache-explicitly-destroy-mutex-while-exiting.patch