From 79f2b358c9ba373943a9284be2861fde58291c4e Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 29 Feb 2016 15:59:45 +0100 Subject: nvme: don't poll the CQ from the kthread There is no reason to do unconditional polling of CQs per the NVMe spec. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Johannes Thumshirn Signed-off-by: Jens Axboe --- drivers/nvme/host/pci.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 21b0be480fa5..10839f76179c 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1156,9 +1156,6 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, nvmeq->qid = qid; nvmeq->cq_vector = -1; dev->queues[qid] = nvmeq; - - /* make sure queue descriptor is set before queue count, for kthread */ - mb(); dev->queue_count++; return nvmeq; @@ -1345,7 +1342,6 @@ static int nvme_kthread(void *data) set_current_state(TASK_INTERRUPTIBLE); spin_lock(&dev_list_lock); list_for_each_entry_safe(dev, next, &dev_list, node) { - int i; u32 csts = readl(dev->bar + NVME_REG_CSTS); /* @@ -1363,14 +1359,6 @@ static int nvme_kthread(void *data) } continue; } - for (i = 0; i < dev->queue_count; i++) { - struct nvme_queue *nvmeq = dev->queues[i]; - if (!nvmeq) - continue; - spin_lock_irq(&nvmeq->q_lock); - nvme_process_cq(nvmeq); - spin_unlock_irq(&nvmeq->q_lock); - } } spin_unlock(&dev_list_lock); schedule_timeout(round_jiffies_relative(HZ)); -- cgit v1.2.3