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>

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)