diff options
| author | Keith Busch <keith.busch@intel.com> | 2018-06-06 08:13:05 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-06-08 12:51:11 -0600 |
| commit | 397c699fb096e7a822990990c17c6b43e829cfc4 (patch) | |
| tree | 9c158c14be3e10688cddb9bdba2af52619df4860 /drivers | |
| parent | 0bc88192033a6e652e3fb1adfd6d1b66be33951e (diff) | |
| download | lwn-397c699fb096e7a822990990c17c6b43e829cfc4.tar.gz lwn-397c699fb096e7a822990990c17c6b43e829cfc4.zip | |
nvme-pci: remove unnecessary completion doorbell check
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 <keith.busch@intel.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/nvme/host/pci.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index a7bed8dccd61..4963a407e728 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -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) |