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nvme-pci: remove unnecessary completion doorbell check

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The nvme pci driver never unmaps the doorbell registers while the requests
are active, so we can always safely update the completion queue head.

Signed-off-by: Keith Busch <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Keith Busch 2018-06-06 08:13:05 -06:00 • committed by Jens Axboe
commit 397c699fb0
1 changed files with 3 additions and 5 deletions
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8
drivers/nvme/host/pci.c
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@ -920,11 +920,9 @@ static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq)
{
u16 head = nvmeq->cq_head;
if (likely(nvmeq->cq_vector >= 0)) {
if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
nvmeq->dbbuf_cq_ei))
writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
}
if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
nvmeq->dbbuf_cq_ei))
writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
}
static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, u16 idx)