nvme-rdma: disable the controller on resets

Mimic the pci driver as a controller disable might be more lightweight
than a shutdown.
Signed-off-by: NSagi Grimberg <sagi@grimberg.me>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

drivers/nvme/host/rdma.c

@@ -1655,7 +1655,7 @@ static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
 	.timeout	= nvme_rdma_timeout,
 };
 
-static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl)
+static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 {
 	cancel_work_sync(&ctrl->err_work);
 	cancel_delayed_work_sync(&ctrl->reconnect_work);
@@ -1667,8 +1667,10 @@ static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl)
 		nvme_rdma_free_io_queues(ctrl);
 	}
 
-	if (test_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[0].flags))
+	if (shutdown)
 		nvme_shutdown_ctrl(&ctrl->ctrl);
+	else
+		nvme_disable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
 
 	blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
 	blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
@@ -1682,7 +1684,7 @@ static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 	nvme_stop_ctrl(&ctrl->ctrl);
 	nvme_remove_namespaces(&ctrl->ctrl);
 	if (shutdown)
-		nvme_rdma_shutdown_ctrl(ctrl);
+		nvme_rdma_shutdown_ctrl(ctrl, shutdown);
 
 	nvme_uninit_ctrl(&ctrl->ctrl);
 	if (ctrl->ctrl.tagset) {
@@ -1746,7 +1748,7 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
 	bool changed;
 
 	nvme_stop_ctrl(&ctrl->ctrl);
-	nvme_rdma_shutdown_ctrl(ctrl);
+	nvme_rdma_shutdown_ctrl(ctrl, false);
 
 	ret = nvme_rdma_configure_admin_queue(ctrl);
 	if (ret) {