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@xxxxxxxxxxxxxxx> know about it.
>From 9dbeaeabacb26260d1621fe58f0f6fdedc8860d4 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
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@xxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx 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
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