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md: flush ->event_work before stopping array.

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commit ee5d004fd0 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: 9d09e663d5 ("dm: raid456 basic support")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
NeilBrown 2015-07-22 10:20:07 +10:00 committed by Greg Kroah-Hartman
parent 1335a48ac2
commit d7b00aadea
1 changed files with 2 additions and 0 deletions
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2
drivers/md/md.c
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@ -5306,6 +5306,8 @@ EXPORT_SYMBOL_GPL(md_stop_writes);
static void __md_stop(struct mddev *mddev)
{
mddev->ready = 0;
/* Ensure ->event_work is done */
flush_workqueue(md_misc_wq);
mddev->pers->stop(mddev);
if (mddev->pers->sync_request && mddev->to_remove == NULL)
mddev->to_remove = &md_redundancy_group;