blk-mq: don't dispatch request in blk_mq_request_direct_issue if queue is busy

	return ret;

}

static void __blk_mq_fallback_to_insert(struct request *rq,

					bool run_queue, bool bypass_insert)

{

	if (!bypass_insert)

		blk_mq_sched_insert_request(rq, false, run_queue, false);

	else

		blk_mq_request_bypass_insert(rq, run_queue);

}

static blk_status_t __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,

						struct request *rq,

						blk_qc_t *cookie,

	struct request_queue *q = rq->q;

	bool run_queue = true;

	/* RCU or SRCU read lock is needed before checking quiesced flag */

	/*

	 * RCU or SRCU read lock is needed before checking quiesced flag.

	 *

	 * When queue is stopped or quiesced, ignore 'bypass_insert' from

	 * blk_mq_request_direct_issue(), and return BLK_STS_OK to caller,

	 * and avoid driver to try to dispatch again.

	 */

	if (blk_mq_hctx_stopped(hctx) || blk_queue_quiesced(q)) {

		run_queue = false;

		bypass_insert = false;

		goto insert;

	}

	return __blk_mq_issue_directly(hctx, rq, cookie);

insert:

	__blk_mq_fallback_to_insert(rq, run_queue, bypass_insert);

	if (bypass_insert)

		return BLK_STS_RESOURCE;

	blk_mq_sched_insert_request(rq, false, run_queue, false);

	return BLK_STS_OK;

}

	ret = __blk_mq_try_issue_directly(hctx, rq, cookie, false);

	if (ret == BLK_STS_RESOURCE)

		__blk_mq_fallback_to_insert(rq, true, false);

		blk_mq_sched_insert_request(rq, false, true, false);

	else if (ret != BLK_STS_OK)

		blk_mq_end_request(rq, ret);