On Wed, Apr 24, 2019 at 07:02:13PM +0800, Ming Lei wrote:
> if (rq->mq_hctx != this_hctx || rq->mq_ctx != this_ctx) {
> if (this_hctx) {
> trace_block_unplug(this_q, depth, !from_schedule);
> +
> + percpu_ref_get(&this_q->q_usage_counter);
> blk_mq_sched_insert_requests(this_hctx, this_ctx,
> &rq_list,
> from_schedule);
> + percpu_ref_put(&this_q->q_usage_counter);
> }
>
> this_q = rq->q;
> @@ -1757,8 +1760,11 @@ void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule)
> */
> if (this_hctx) {
> trace_block_unplug(this_q, depth, !from_schedule);
> +
> + percpu_ref_get(&this_q->q_usage_counter);
> blk_mq_sched_insert_requests(this_hctx, this_ctx, &rq_list,
> from_schedule);
> + percpu_ref_put(&this_q->q_usage_counter);
Why don't we push this into blk_mq_sched_insert_requests? Yes, it
would need a request_queue argument, but that still seems saner
than duplicating it in both callers.
