linux-kernel - [PATCH AUTOSEL 5.14 30/40] nvme-fc: update hardware queues before using them

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Message-Id: <20210928055524.172051-30-sashal@kernel.org>
Date:   Tue, 28 Sep 2021 01:55:14 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Daniel Wagner <dwagner@...e.de>, Ming Lei <ming.lei@...hat.com>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Hannes Reinecke <hare@...e.de>,
        James Smart <jsmart2021@...il.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, james.smart@...adcom.com,
        kbusch@...nel.org, axboe@...com, Christoph@...r.kernel.org,
        sagi@...mberg.me, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.14 30/40] nvme-fc: update hardware queues before using them

From: Daniel Wagner <dwagner@...e.de>

[ Upstream commit 555f66d0f8a38537456acc77043d0e4469fcbe8e ]

In case the number of hardware queues changes, we need to update the
tagset and the mapping of ctx to hctx first.

If we try to create and connect the I/O queues first, this operation
will fail (target will reject the connect call due to the wrong number
of queues) and hence we bail out of the recreate function. Then we
will to try the very same operation again, thus we don't make any
progress.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: James Smart <jsmart2021@...il.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/fc.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index b08a61ca283f..b5d9a5507de5 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2951,14 +2951,6 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 	if (ctrl->ctrl.queue_count == 1)
 		return 0;
 
-	ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
-	if (ret)
-		goto out_free_io_queues;
-
-	ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
-	if (ret)
-		goto out_delete_hw_queues;
-
 	if (prior_ioq_cnt != nr_io_queues) {
 		dev_info(ctrl->ctrl.device,
 			"reconnect: revising io queue count from %d to %d\n",
@@ -2968,6 +2960,14 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 		nvme_unfreeze(&ctrl->ctrl);
 	}
 
+	ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
+	if (ret)
+		goto out_free_io_queues;
+
+	ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.sqsize + 1);
+	if (ret)
+		goto out_delete_hw_queues;
+
 	return 0;
 
 out_delete_hw_queues:
-- 
2.33.0