linux-kernel - [PATCH v3 3/6] nvme-rdma: Update number of hardware queues before using them

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Date:   Tue, 20 Jul 2021 14:43:50 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        James Smart <james.smart@...adcom.com>,
        Keith Busch <kbusch@...nel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v3 3/6] nvme-rdma: Update number of hardware queues before using them

When the number of hardware queues changes during resetting we should
update the tagset first before using it.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/host/rdma.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 00fcbd985102..57d20100be56 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -966,6 +966,7 @@ static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
 static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 {
 	int ret;
+	u32 prior_q_cnt = ctrl->ctrl.queue_count;
 
 	ret = nvme_rdma_alloc_io_queues(ctrl);
 	if (ret)
@@ -983,13 +984,7 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 			ret = PTR_ERR(ctrl->ctrl.connect_q);
 			goto out_free_tag_set;
 		}
-	}
-
-	ret = nvme_rdma_start_io_queues(ctrl);
-	if (ret)
-		goto out_cleanup_connect_q;
-
-	if (!new) {
+	} else if (prior_q_cnt != ctrl->ctrl.queue_count) {
 		nvme_start_queues(&ctrl->ctrl);
 		if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) {
 			/*
@@ -1005,6 +1000,10 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
 		nvme_unfreeze(&ctrl->ctrl);
 	}
 
+	ret = nvme_rdma_start_io_queues(ctrl);
+	if (ret)
+		goto out_cleanup_connect_q;
+
 	return 0;
 
 out_wait_freeze_timed_out:
-- 
2.29.2