nvme-rdma: don't free tagset on resets

We're not supposed to do that.
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/rdma.c

@@ -712,16 +712,20 @@ static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
 	return ERR_PTR(ret);
 }
 
-static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl)
+static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
+		bool remove)
 {
 	nvme_rdma_free_qe(ctrl->queues[0].device->dev, &ctrl->async_event_sqe,
 			sizeof(struct nvme_command), DMA_TO_DEVICE);
 	nvme_rdma_stop_and_free_queue(&ctrl->queues[0]);
-	blk_cleanup_queue(ctrl->ctrl.admin_q);
-	nvme_rdma_free_tagset(&ctrl->ctrl, true);
+	if (remove) {
+		blk_cleanup_queue(ctrl->ctrl.admin_q);
+		nvme_rdma_free_tagset(&ctrl->ctrl, true);
+	}
 }
 
-static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl)
+static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
+		bool new)
 {
 	int error;
 
@@ -734,14 +738,21 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl)
 	ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS,
 		ctrl->device->dev->attrs.max_fast_reg_page_list_len);
 
-	ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
-	if (IS_ERR(ctrl->ctrl.admin_tagset))
-		goto out_free_queue;
+	if (new) {
+		ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
+		if (IS_ERR(ctrl->ctrl.admin_tagset))
+			goto out_free_queue;
 
-	ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
-	if (IS_ERR(ctrl->ctrl.admin_q)) {
-		error = PTR_ERR(ctrl->ctrl.admin_q);
-		goto out_free_tagset;
+		ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
+		if (IS_ERR(ctrl->ctrl.admin_q)) {
+			error = PTR_ERR(ctrl->ctrl.admin_q);
+			goto out_free_tagset;
+		}
+	} else {
+		error = blk_mq_reinit_tagset(&ctrl->admin_tag_set,
+					     nvme_rdma_reinit_request);
+		if (error)
+			goto out_free_queue;
 	}
 
 	error = nvmf_connect_admin_queue(&ctrl->ctrl);
@@ -781,11 +792,11 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl)
 	return 0;
 
 out_cleanup_queue:
-	blk_cleanup_queue(ctrl->ctrl.admin_q);
+	if (new)
+		blk_cleanup_queue(ctrl->ctrl.admin_q);
 out_free_tagset:
-	/* disconnect and drain the queue before freeing the tagset */
-	nvme_rdma_stop_queue(&ctrl->queues[0]);
-	nvme_rdma_free_tagset(&ctrl->ctrl, true);
+	if (new)
+		nvme_rdma_free_tagset(&ctrl->ctrl, true);
 out_free_queue:
 	nvme_rdma_free_queue(&ctrl->queues[0]);
 	return error;
@@ -1676,7 +1687,7 @@ static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 	blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
 				nvme_cancel_request, &ctrl->ctrl);
 	blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
-	nvme_rdma_destroy_admin_queue(ctrl);
+	nvme_rdma_destroy_admin_queue(ctrl, shutdown);
 }
 
 static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
@@ -1750,7 +1761,7 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
 	nvme_stop_ctrl(&ctrl->ctrl);
 	nvme_rdma_shutdown_ctrl(ctrl, false);
 
-	ret = nvme_rdma_configure_admin_queue(ctrl);
+	ret = nvme_rdma_configure_admin_queue(ctrl, false);
 	if (ret) {
 		/* ctrl is already shutdown, just remove the ctrl */
 		INIT_WORK(&ctrl->delete_work, nvme_rdma_remove_ctrl_work);
@@ -1891,7 +1902,7 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 	if (!ctrl->queues)
 		goto out_uninit_ctrl;
 
-	ret = nvme_rdma_configure_admin_queue(ctrl);
+	ret = nvme_rdma_configure_admin_queue(ctrl, true);
 	if (ret)
 		goto out_kfree_queues;
 
@@ -1948,7 +1959,7 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 	return &ctrl->ctrl;
 
 out_remove_admin_queue:
-	nvme_rdma_destroy_admin_queue(ctrl);
+	nvme_rdma_destroy_admin_queue(ctrl, true);
 out_kfree_queues:
 	kfree(ctrl->queues);
 out_uninit_ctrl: