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Commit d1f06f4a authored by Jens Axboe's avatar Jens Axboe Committed by Keith Busch
Browse files

nvme-pci: move ->cq_vector == -1 check outside of ->q_lock 



We only clear it dynamically in nvme_suspend_queue(). When we do, ensure
to do a full flush so that any nvme_queue_rq() invocation will see it.

Ideally we'd kill this check completely, but we're using it to flush
requests on a dying queue.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent f9dde187

drivers/nvme/host/pci.c

+13 −5
Original line number Diff line number Diff line
@@ -872,6 +872,13 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 
	struct nvme_command cmnd;

	blk_status_t ret;



	/*

	 * We should not need to do this, but we're still using this to

	 * ensure we can drain requests on a dying queue.

	 */

	if (unlikely(nvmeq->cq_vector < 0))

		return BLK_STS_IOERR;



	ret = nvme_setup_cmd(ns, req, &cmnd);

	if (ret)

		return ret;
@@ -889,11 +896,6 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 
	blk_mq_start_request(req);



	spin_lock_irq(&nvmeq->q_lock);

	if (unlikely(nvmeq->cq_vector < 0)) {

		ret = BLK_STS_IOERR;

		spin_unlock_irq(&nvmeq->q_lock);

		goto out_cleanup_iod;

	}

	__nvme_submit_cmd(nvmeq, &cmnd);

	spin_unlock_irq(&nvmeq->q_lock);

	return BLK_STS_OK;
@@ -1321,6 +1323,12 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq) 
	nvmeq->cq_vector = -1;

	spin_unlock_irq(&nvmeq->q_lock);



	/*

	 * Ensure that nvme_queue_rq() sees it ->cq_vector == -1 without

	 * having to grab the lock.

	 */

	mb();



	if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q)

		blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q);