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OpenCloudOS-Kernel
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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 <bart.vanassche@sandisk.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>

Fixed up the description a bit.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2017-05-02 07:28:02 +08:00 committed by Jens Axboe
parent d6296d39e9
commit 7a148c2fcf
2 changed files with 0 additions and 5 deletions
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2
block/blk-mq.c
View File

@ -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;
}

3
block/elevator.c
View File

@ -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;
}
/*