From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Ming Lei To: Jens Axboe , Keith Busch , Christoph Hellwig , Sagi Grimberg Cc: linux-nvme@lists.infradead.org, Zhang Yi , linux-block@vger.kernel.org, Johannes Thumshirn , Ming Lei , stable@vger.kernel.org Subject: [PATCH v3 2/3] nvme: avoid to use blk_mq_abort_requeue_list() Date: Mon, 22 May 2017 23:05:04 +0800 Message-Id: <20170522150505.452-3-ming.lei@redhat.com> In-Reply-To: <20170522150505.452-1-ming.lei@redhat.com> References: <20170522150505.452-1-ming.lei@redhat.com> List-ID: NVMe may add request into requeue list simply and not kick off the requeue if hw queues are stopped. Then blk_mq_abort_requeue_list() is called in both nvme_kill_queues() and nvme_ns_remove() for dealing with this issue. Unfortunately blk_mq_abort_requeue_list() is absolutely a race maker, for example, one request may be requeued during the aborting. So this patch just calls blk_mq_kick_requeue_list() in nvme_kill_queues() to handle this issue like what nvme_start_queues() does. Now all requests in requeue list when queues are stopped will be handled by blk_mq_kick_requeue_list() when queues are restarted, either in nvme_start_queues() or in nvme_kill_queues(). Cc: stable@vger.kernel.org Reported-by: Zhang Yi Reviewed-by: Keith Busch Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Signed-off-by: Ming Lei --- drivers/nvme/host/core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 40d5e4a9e8d7..04e115834702 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2098,7 +2098,6 @@ static void nvme_ns_remove(struct nvme_ns *ns) if (ns->ndev) nvme_nvm_unregister_sysfs(ns); del_gendisk(ns->disk); - blk_mq_abort_requeue_list(ns->queue); blk_cleanup_queue(ns->queue); } @@ -2436,7 +2435,6 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl) continue; revalidate_disk(ns->disk); blk_set_queue_dying(ns->queue); - blk_mq_abort_requeue_list(ns->queue); /* * Forcibly start all queues to avoid having stuck requests. @@ -2444,6 +2442,9 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl) * when the final removal happens. */ blk_mq_start_hw_queues(ns->queue); + + /* draining requests in requeue list */ + blk_mq_kick_requeue_list(ns->queue); } mutex_unlock(&ctrl->namespaces_mutex); } -- 2.9.4