blk-mq: Remove blk_mq_cancel_requeue_work()

Since blk_mq_requeue_work() no longer restarts stopped queues
canceling requeue work is no longer needed to prevent that a
stopped queue would be restarted. Hence remove this function.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

block/blk-mq.c

@@ -526,12 +526,6 @@ void blk_mq_add_to_requeue_list(struct request *rq, bool at_head)
 }
 EXPORT_SYMBOL(blk_mq_add_to_requeue_list);
 
-void blk_mq_cancel_requeue_work(struct request_queue *q)
-{
-	cancel_delayed_work_sync(&q->requeue_work);
-}
-EXPORT_SYMBOL_GPL(blk_mq_cancel_requeue_work);
-
 void blk_mq_kick_requeue_list(struct request_queue *q)
 {
 	kblockd_schedule_delayed_work(&q->requeue_work, 0);

drivers/md/dm-rq.c

@@ -116,8 +116,6 @@ static void dm_mq_stop_queue(struct request_queue *q)
 	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);
 }
 

drivers/nvme/host/core.c

@@ -2081,7 +2081,6 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl)
 		queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
 		spin_unlock_irq(ns->queue->queue_lock);
 
-		blk_mq_cancel_requeue_work(ns->queue);
 		blk_mq_stop_hw_queues(ns->queue);
 	}
 	mutex_unlock(&ctrl->namespaces_mutex);

include/linux/blk-mq.h

@@ -217,7 +217,6 @@ void __blk_mq_end_request(struct request *rq, int error);
 
 void blk_mq_requeue_request(struct request *rq);
 void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
-void blk_mq_cancel_requeue_work(struct request_queue *q);
 void blk_mq_kick_requeue_list(struct request_queue *q);
 void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
 void blk_mq_abort_requeue_list(struct request_queue *q);