From: NeilBrown <neilb@suse.com>
Date: Wed, 22 Jul 2015 00:20:07 +0000 (+1000)
Subject: md: flush ->event_work before stopping array.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ee5d004fd0591536a061451eba2b187092e9127c;p=linux-beck.git

md: flush ->event_work before stopping array.

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 <heinzm@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Cc: stable@vger.kernel.org (2.6.38+ please delay 2 weeks after -final release)
Fixes: 9d09e663d550 ("dm: raid456 basic support")
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index df92d30ca054..5025b3ec13cd 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5382,6 +5382,8 @@ static void __md_stop(struct mddev *mddev)
 {
 	struct md_personality *pers = mddev->pers;
 	mddev_detach(mddev);
+	/* Ensure ->event_work is done */
+	flush_workqueue(md_misc_wq);
 	spin_lock(&mddev->lock);
 	mddev->ready = 0;
 	mddev->pers = NULL;