Patch "md: flush ->event_work before stopping array." has been added to the 4.1-stable tree

Patch "md: flush ->event_work before stopping array." has been added to the 4.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    md: flush ->event_work before stopping array.

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     md-flush-event_work-before-stopping-array.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ee5d004fd0591536a061451eba2b187092e9127c Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.com>
Date: Wed, 22 Jul 2015 10:20:07 +1000
Subject: md: flush ->event_work before stopping array.

From: NeilBrown <neilb@suse.com>

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 <heinzm@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Fixes: 9d09e663d550 ("dm: raid456 basic support")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/md.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5365,6 +5365,8 @@ static void __md_stop(struct mddev *mdde
 {
 	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;


Patches currently in stable-queue which might be from neilb@suse.com are

queue-4.1/md-raid5-avoid-races-when-changing-cache-size.patch
queue-4.1/md-flush-event_work-before-stopping-array.patch
queue-4.1/md-raid5-don-t-let-shrink_slab-shrink-too-far.patch
queue-4.1/nfsv4-don-t-set-setattr-for-o_rdonly-o_excl.patch
queue-4.1/md-raid10-always-set-reshape_safe-when-initializing-reshape_position.patch