From 7a148c2fcff83309748bfaafe121aa85b724624f Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 2 May 2017 07:28:02 +0800 Subject: [PATCH] block: don't call blk_mq_quiesce_queue() after queue is frozen After queue is frozen, no request in this queue can be in use at all, so there can't be any .queue_rq() running on this queue. It isn't necessary to call blk_mq_quiesce_queue() any more, so remove it in both elevator_switch_mq() and blk_mq_update_nr_requests(). Cc: Bart Van Assche Signed-off-by: Ming Lei Fixed up the description a bit. Signed-off-by: Jens Axboe --- block/blk-mq.c | 2 -- block/elevator.c | 3 --- 2 files changed, 5 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index b81e4a7cd7f2..e339247a2570 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2609,7 +2609,6 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) return -EINVAL; blk_mq_freeze_queue(q); - blk_mq_quiesce_queue(q); ret = 0; queue_for_each_hw_ctx(q, hctx, i) { @@ -2635,7 +2634,6 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) q->nr_requests = nr; blk_mq_unfreeze_queue(q); - blk_mq_start_stopped_hw_queues(q, true); return ret; } diff --git a/block/elevator.c b/block/elevator.c index 80f485451096..ab726a5c0bf6 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -950,7 +950,6 @@ static int elevator_switch_mq(struct request_queue *q, int ret; blk_mq_freeze_queue(q); - blk_mq_quiesce_queue(q); if (q->elevator) { if (q->elevator->registered) @@ -978,9 +977,7 @@ static int elevator_switch_mq(struct request_queue *q, out: blk_mq_unfreeze_queue(q); - blk_mq_start_stopped_hw_queues(q, true); return ret; - } /* -- 2.30.2