retrieve bios of all requests on queue to drain requests, then needn't depend on storage device to drain the queue any more. Signed-off-by: Jianchao Wang <jianchao.w.wang@xxxxxxxxxx> --- block/blk-mq.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index f75598b..6d89d3e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3085,7 +3085,10 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, return; list_for_each_entry(q, &set->tag_list, tag_set_list) - blk_mq_freeze_queue(q); + blk_freeze_queue_start(q); + + list_for_each_entry(q, &set->tag_list, tag_set_list) + blk_mq_sched_retrieve_bios(q); /* * Sync with blk_mq_queue_tag_busy_iter. */ -- 2.7.4
