From bf09aabeedb4fcd57b504e247c264b4bfbc99622 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 22 Jul 2015 10:20:07 +1000 Subject: [PATCH] md: flush ->event_work before stopping array. commit ee5d004fd0591536a061451eba2b187092e9127c upstream. The 'event_work' worker used by dm-raid may still be running when the array is stopped. This can result in an oops. So flush the workqueue on which it is run after detaching and before destroying the device. Reported-by: Heinz Mauelshagen Signed-off-by: NeilBrown Fixes: 9d09e663d550 ("dm: raid456 basic support") [lizf: Backported to 3.4: adjust context] Signed-off-by: Zefan Li --- drivers/md/md.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/md.c b/drivers/md/md.c index 25f0cb59ebf07..a875348e819e3 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5127,6 +5127,8 @@ static void __md_stop(struct mddev *mddev) if (mddev->pers->sync_request && mddev->to_remove == NULL) mddev->to_remove = &md_redundancy_group; module_put(mddev->pers->owner); + /* Ensure ->event_work is done */ + flush_workqueue(md_misc_wq); mddev->pers = NULL; clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); } -- 2.47.2