From c2e82a234873d905260a3bd0aca9577e85619bda Mon Sep 17 00:00:00 2001 From: weiping zhang Date: Fri, 22 Sep 2017 23:36:28 +0800 Subject: blk-mq: fix nr_requests wrong value when modify it from sysfs if blk-mq use "none" io scheduler, nr_request get a wrong value when input a number > tag_set->queue_depth. blk_mq_tag_update_depth will get the smaller one min(nr, set->queue_depth), and then q->nr_request get a wrong value. Reproduce: echo none > /sys/block/nvme0n1/queue/scheduler echo 1000000 > /sys/block/nvme0n1/queue/nr_requests cat /sys/block/nvme0n1/queue/nr_requests 1000000 Signed-off-by: weiping zhang Signed-off-by: Jens Axboe --- block/blk-mq.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'block') diff --git a/block/blk-mq.c b/block/blk-mq.c index 95ea588..9eea67c 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2743,8 +2743,7 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) * queue depth. This is similar to what the old code would do. */ if (!hctx->sched_tags) { - ret = blk_mq_tag_update_depth(hctx, &hctx->tags, - min(nr, set->queue_depth), + ret = blk_mq_tag_update_depth(hctx, &hctx->tags, nr, false); } else { ret = blk_mq_tag_update_depth(hctx, &hctx->sched_tags, -- cgit v1.1