From fe9af155b3346f1236dd442d8f770de52cda4bf5 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 27 Feb 2015 14:04:27 -0500 Subject: [PATCH] dm: hold suspend_lock while suspending device during device deletion commit ab7c7bb6f4ab95dbca96fcfc4463cd69843e3e24 upstream. __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 Signed-off-by: Zefan Li --- drivers/md/dm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 8780a222bbee7..3bfbccc3f0a73 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2295,10 +2295,16 @@ static void __dm_destroy(struct mapped_device *md, bool wait) set_bit(DMF_FREEING, &md->flags); spin_unlock(&_minor_lock); + /* + * 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); /* * Rare, but there may be I/O requests still going to complete, -- 2.47.2