[PATCH] dm-raid locking fix

This code was never designed to handle more than one instance of do_work()
running at once.

Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 12031c9..b08df8b 100644 (file)
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1230,7 +1230,7 @@ static int __init dm_mirror_init(void)
        if (r)
                return r;
 
-       _kmirrord_wq = create_workqueue("kmirrord");
+       _kmirrord_wq = create_singlethread_workqueue("kmirrord");
        if (!_kmirrord_wq) {
                DMERR("couldn't start kmirrord");
                dm_dirty_log_exit();