On Mon, 2017-11-06 at 18:43 +0800, Ming Lei wrote:
> @@ -2665,6 +2665,7 @@ 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) {
Before more blk_mq_quiesce_queue() callers are added a counter mechanism
has to be added into blk_mq_quiesce_queue_nowait() and blk_mq_unquiesce_queue()
to avoid trouble due to concurrent blk_mq_quiesce_queue_nowait() and/or
blk_mq_unquiesce_queue() calls.
Bart.
