linux-kernel - [PATCH 4.9 113/151] dm: use blk_set_queue_dying() in __dm

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Date:   Wed, 27 Nov 2019 21:31:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 4.9 113/151] dm: use blk_set_queue_dying() in __dm_destroy()

From: Bart Van Assche <bart.vanassche@...disk.com>

commit 2e91c3694181dc500faffec16c5aaa0ac5e15449 upstream.

After QUEUE_FLAG_DYING has been set any code that is waiting in
get_request() should be woken up.  But to get this behaviour
blk_set_queue_dying() must be used instead of only setting
QUEUE_FLAG_DYING.

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1946,9 +1946,7 @@ static void __dm_destroy(struct mapped_d
 	set_bit(DMF_FREEING, &md->flags);
 	spin_unlock(&_minor_lock);
 
-	spin_lock_irq(q->queue_lock);
-	queue_flag_set(QUEUE_FLAG_DYING, q);
-	spin_unlock_irq(q->queue_lock);
+	blk_set_queue_dying(q);
 
 	if (dm_request_based(md) && md->kworker_task)
 		kthread_flush_worker(&md->kworker);