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dm rq: factor out dm_mq_stop_queue() 

Also, check that the blk-mq request_queue isn't already stopped.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Bart Van Assche 2016-08-31 15:18:11 -07:00 committed by Mike Snitzer
parent 3b785fbcf8
commit 2397a15aff
1 changed files with 20 additions and 8 deletions
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28
drivers/md/dm-rq.c
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@ -98,18 +98,30 @@ static void dm_old_stop_queue(struct request_queue *q)
spin_unlock_irqrestore(q->queue_lock, flags);
}
static void dm_mq_stop_queue(struct request_queue *q)
{
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
if (blk_queue_stopped(q)) {
spin_unlock_irqrestore(q->queue_lock, flags);
return;
}
queue_flag_set(QUEUE_FLAG_STOPPED, q);
spin_unlock_irqrestore(q->queue_lock, flags);
/* Avoid that requeuing could restart the queue. */
blk_mq_cancel_requeue_work(q);
blk_mq_stop_hw_queues(q);
}
void dm_stop_queue(struct request_queue *q)
{
if (!q->mq_ops)
dm_old_stop_queue(q);
else {
spin_lock_irq(q->queue_lock);
queue_flag_set(QUEUE_FLAG_STOPPED, q);
spin_unlock_irq(q->queue_lock);
blk_mq_cancel_requeue_work(q);
blk_mq_stop_hw_queues(q);
}
else
dm_mq_stop_queue(q);
}
static struct dm_rq_target_io *alloc_old_rq_tio(struct mapped_device *md,