nvme: use helper nvme_ctrl_state in nvme_keep_alive_finish function

We no more need acquiring ctrl->lock before accessing the
NVMe controller state and instead we can now use the helper
nvme_ctrl_state. So replace the use of ctrl->lock from
nvme_keep_alive_finish function with nvme_ctrl_state call.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

drivers/nvme/host/core.c

@@ -1295,10 +1295,9 @@ static void nvme_queue_keep_alive_work(struct nvme_ctrl *ctrl)
 static void nvme_keep_alive_finish(struct request *rq,
 		blk_status_t status, struct nvme_ctrl *ctrl)
 {
-	unsigned long flags;
-	bool startka = false;
 	unsigned long rtt = jiffies - (rq->deadline - rq->timeout);
 	unsigned long delay = nvme_keep_alive_work_period(ctrl);
+	enum nvme_ctrl_state state = nvme_ctrl_state(ctrl);
 
 	/*
 	 * Subtract off the keepalive RTT so nvme_keep_alive_work runs
@@ -1321,12 +1320,7 @@ static void nvme_keep_alive_finish(struct request *rq,
 
 	ctrl->ka_last_check_time = jiffies;
 	ctrl->comp_seen = false;
-	spin_lock_irqsave(&ctrl->lock, flags);
-	if (ctrl->state == NVME_CTRL_LIVE ||
-	    ctrl->state == NVME_CTRL_CONNECTING)
-		startka = true;
-	spin_unlock_irqrestore(&ctrl->lock, flags);
-	if (startka)
+	if (state == NVME_CTRL_LIVE || state == NVME_CTRL_CONNECTING)
 		queue_delayed_work(nvme_wq, &ctrl->ka_work, delay);
 }