Patch "dm rq: take request_queue lock while clearing QUEUE_FLAG_STOPPED" has been added to the 4.8-stable tree

[<gregkh@linuxfoundation.org>]

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

    dm rq: take request_queue lock while clearing QUEUE_FLAG_STOPPED

to the 4.8-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:
     dm-rq-take-request_queue-lock-while-clearing-queue_flag_stopped.patch
and it can be found in the queue-4.8 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 9dbeaeabacb26260d1621fe58f0f6fdedc8860d4 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 1 Sep 2016 11:59:33 -0400
Subject: dm rq: take request_queue lock while clearing QUEUE_FLAG_STOPPED

From: Mike Snitzer <snitzer@redhat.com>

commit 9dbeaeabacb26260d1621fe58f0f6fdedc8860d4 upstream.

Every call of queue_flag_clear_unlocked() after block device
initialization has finished is wrong if blk_cleanup_queue() can be
called concurrently.  Convert queue_flag_clear_unlocked() into
queue_flag_clear() and protect it by the block layer queue lock.

Also, factor out dm_mq_start_queue().

Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/dm-rq.c |   19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -73,15 +73,24 @@ static void dm_old_start_queue(struct re
 	spin_unlock_irqrestore(q->queue_lock, flags);
 }
 
+static void dm_mq_start_queue(struct request_queue *q)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(q->queue_lock, flags);
+	queue_flag_clear(QUEUE_FLAG_STOPPED, q);
+	spin_unlock_irqrestore(q->queue_lock, flags);
+
+	blk_mq_start_stopped_hw_queues(q, true);
+	blk_mq_kick_requeue_list(q);
+}
+
 void dm_start_queue(struct request_queue *q)
 {
 	if (!q->mq_ops)
 		dm_old_start_queue(q);
-	else {
-		queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, q);
-		blk_mq_start_stopped_hw_queues(q, true);
-		blk_mq_kick_requeue_list(q);
-	}
+	else
+		dm_mq_start_queue(q);
 }
 
 static void dm_old_stop_queue(struct request_queue *q)


Patches currently in stable-queue which might be from snitzer@redhat.com are

queue-4.8/dm-crypt-fix-crash-on-exit.patch
queue-4.8/dm-rq-take-request_queue-lock-while-clearing-queue_flag_stopped.patch
queue-4.8/dm-mark-request_queue-dead-before-destroying-the-dm-device.patch
queue-4.8/dm-mpath-check-if-path-s-request_queue-is-dying-in-activate_path.patch
queue-4.8/dm-return-correct-error-code-in-dm_resume-s-retry-loop.patch