From: Sagi Grimberg <sagi@grimberg.me>
Date: Sun, 24 Jul 2016 06:22:19 +0000 (+0300)
Subject: nvme-rdma: Free the I/O tags when we delete the controller
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a34ca17a9717fe607cd58285a1704cb6526cf561;p=linux-beck.git

nvme-rdma: Free the I/O tags when we delete the controller

If we wait until we free the controller (free_ctrl) we might
lose our rdma device without any notification while we still
have open resources (tags mrs and dma mappings).

Instead, destroy the tags with their rdma resources once we
delete the device and not when freeing it.

Note that we don't do that in nvme_rdma_shutdown_ctrl because
controller reset uses it as well and we want to give active I/O
a chance to complete successfully.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 1279bc292253..6378dc94aeaf 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -686,11 +686,6 @@ static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
 	list_del(&ctrl->list);
 	mutex_unlock(&nvme_rdma_ctrl_mutex);
 
-	if (ctrl->ctrl.tagset) {
-		blk_cleanup_queue(ctrl->ctrl.connect_q);
-		blk_mq_free_tag_set(&ctrl->tag_set);
-		nvme_rdma_dev_put(ctrl->device);
-	}
 	kfree(ctrl->queues);
 	nvmf_free_options(nctrl->opts);
 free_ctrl:
@@ -1665,6 +1660,13 @@ static void __nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 	nvme_uninit_ctrl(&ctrl->ctrl);
 	if (shutdown)
 		nvme_rdma_shutdown_ctrl(ctrl);
+
+	if (ctrl->ctrl.tagset) {
+		blk_cleanup_queue(ctrl->ctrl.connect_q);
+		blk_mq_free_tag_set(&ctrl->tag_set);
+		nvme_rdma_dev_put(ctrl->device);
+	}
+
 	nvme_put_ctrl(&ctrl->ctrl);
 }