From: Mikulas Patocka Date: Fri, 27 Feb 2015 19:04:27 +0000 (-0500) Subject: dm: hold suspend_lock while suspending device during device deletion X-Git-Tag: v4.0-rc5~12^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ab7c7bb6f4ab95dbca96fcfc4463cd69843e3e24;p=platform%2Fkernel%2Flinux-exynos.git dm: hold suspend_lock while suspending device during device deletion __dm_destroy() must take the suspend_lock so that its presuspend and postsuspend calls do not race with an internal suspend. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Cc: stable@vger.kernel.org --- diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 73f2880..e79d5cc 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2638,10 +2638,16 @@ static void __dm_destroy(struct mapped_device *md, bool wait) if (dm_request_based(md)) flush_kthread_worker(&md->kworker); + /* + * Take suspend_lock so that presuspend and postsuspend methods + * do not race with internal suspend. + */ + mutex_lock(&md->suspend_lock); if (!dm_suspended_md(md)) { dm_table_presuspend_targets(map); dm_table_postsuspend_targets(map); } + mutex_unlock(&md->suspend_lock); /* dm_put_live_table must be before msleep, otherwise deadlock is possible */ dm_put_live_table(md, srcu_idx);