Make nvme_requeue_req() check BLK_MQ_S_STOPPED instead of QUEUE_FLAG_STOPPED. Remove the QUEUE_FLAG_STOPPED manipulations that became superfluous because of this change. Change blk_queue_stopped() tests into blk_mq_queue_stopped(). This patch fixes a race condition: using queue_flag_clear_unlocked() is not safe if any other function that manipulates the queue flags can be called concurrently, e.g. blk_cleanup_queue(). Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> Cc: Keith Busch <keith.busch@xxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Sagi Grimberg <sagi@xxxxxxxxxxx> --- drivers/nvme/host/core.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index fe15d94..45dd237 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -201,13 +201,7 @@ static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk) void nvme_requeue_req(struct request *req) { - unsigned long flags; - - blk_mq_requeue_request(req, false); - spin_lock_irqsave(req->q->queue_lock, flags); - if (!blk_queue_stopped(req->q)) - blk_mq_kick_requeue_list(req->q); - spin_unlock_irqrestore(req->q->queue_lock, flags); + blk_mq_requeue_request(req, !blk_mq_queue_stopped(req->q)); } EXPORT_SYMBOL_GPL(nvme_requeue_req); @@ -2078,13 +2072,8 @@ void nvme_stop_queues(struct nvme_ctrl *ctrl) struct nvme_ns *ns; mutex_lock(&ctrl->namespaces_mutex); - list_for_each_entry(ns, &ctrl->namespaces, list) { - spin_lock_irq(ns->queue->queue_lock); - queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); - spin_unlock_irq(ns->queue->queue_lock); - + list_for_each_entry(ns, &ctrl->namespaces, list) blk_mq_quiesce_queue(ns->queue); - } mutex_unlock(&ctrl->namespaces_mutex); } EXPORT_SYMBOL_GPL(nvme_stop_queues); @@ -2095,7 +2084,6 @@ void nvme_start_queues(struct nvme_ctrl *ctrl) mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry(ns, &ctrl->namespaces, list) { - queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); blk_mq_start_stopped_hw_queues(ns->queue, true); blk_mq_kick_requeue_list(ns->queue); } -- 2.10.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html