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authorChristoph Hellwig <hch@lst.de>2016-02-29 15:59:45 +0100
committerJens Axboe <axboe@fb.com>2016-02-29 08:47:14 -0700
commit79f2b358c9ba373943a9284be2861fde58291c4e (patch)
treef0c35f08d9937084dc0c1395c5d2790e7abc82c6 /drivers/nvme
parent9396dec916c052855dbb5b876c13d163df397319 (diff)
downloadlinux-79f2b358c9ba373943a9284be2861fde58291c4e.tar.bz2
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 <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/pci.c12
1 files changed, 0 insertions, 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));