From 986f75c876dbafed98eba7cb516c5118f155db23 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Mon, 22 May 2017 23:05:04 +0800 Subject: [PATCH] nvme: avoid to use blk_mq_abort_requeue_list() 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: Johannes Thumshirn Signed-off-by: Ming Lei Signed-off-by: Christoph Hellwig --- 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); } -- 2.20.1