nvme-fc: wait for queues to freeze before calling update_hr_hw_queues

On reconnect, the code currently does not freeze the controller before
possibly updating the number hw queues for the controller.

Add the freeze before updating the number of hw queues.  Note: the queues
are already started and remain started through the reconnect.
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/fc.c

@@ -2885,11 +2885,14 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 	if (ret)
 		goto out_delete_hw_queues;
 
-	if (prior_ioq_cnt != nr_io_queues)
+	if (prior_ioq_cnt != nr_io_queues) {
 		dev_info(ctrl->ctrl.device,
 			"reconnect: revising io queue count from %d to %d\n",
 			prior_ioq_cnt, nr_io_queues);
-	blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
+		nvme_wait_freeze(&ctrl->ctrl);
+		blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
+		nvme_unfreeze(&ctrl->ctrl);
+	}
 
 	return 0;