[PATCH 2/4] nvme: split command copy into a helper

[Jens Axboe <axboe@kernel.dk>]

We'll need it for batched submit as well.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 drivers/nvme/host/pci.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 8637538f3fd5..09ea21f75439 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -500,6 +500,15 @@ static inline void nvme_write_sq_db(struct nvme_queue *nvmeq, bool write_sq)
 	nvmeq->last_sq_tail = nvmeq->sq_tail;
 }
 
+static inline void nvme_sq_copy_cmd(struct nvme_queue *nvmeq,
+				    struct nvme_command *cmd)
+{
+	memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes), cmd,
+		sizeof(*cmd));
+	if (++nvmeq->sq_tail == nvmeq->q_depth)
+		nvmeq->sq_tail = 0;
+}
+
 /**
  * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
  * @nvmeq: The queue to use
@@ -510,10 +519,7 @@ static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
 			    bool write_sq)
 {
 	spin_lock(&nvmeq->sq_lock);
-	memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes),
-	       cmd, sizeof(*cmd));
-	if (++nvmeq->sq_tail == nvmeq->q_depth)
-		nvmeq->sq_tail = 0;
+	nvme_sq_copy_cmd(nvmeq, cmd);
 	nvme_write_sq_db(nvmeq, write_sq);
 	spin_unlock(&nvmeq->sq_lock);
 }
-- 
2.34.1