linux-kernel - [PATCH v4 7/8] nvme-tcp: Unfreeze queues on reconnect

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Message-Id: <20210802091419.56425-8-dwagner@suse.de>
Date:   Mon,  2 Aug 2021 11:14:18 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-kernel@...r.kernel.org
Cc:     James Smart <james.smart@...adcom.com>,
        Keith Busch <kbusch@...nel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hannes Reinecke <hare@...e.de>,
        Wen Xiong <wenxiong@...ibm.com>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v4 7/8] nvme-tcp: Unfreeze queues on reconnect

During the queue teardown in nvme_tcp_teardown_io_queues() freeze is
called unconditionally. When we reconnect we need to pair the freeze
with an unfreeze to avoid hanging I/Os. For newly created connection
this is not needed.

Fixes: 2875b0aecabe ("nvme-tcp: fix controller reset hang during traffic")
Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/host/tcp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 32268f24f62a..097f7dd10ed3 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1819,9 +1819,11 @@ static int nvme_tcp_configure_io_queues(struct nvme_ctrl *ctrl, bool new)
 		}
 		blk_mq_update_nr_hw_queues(ctrl->tagset,
 			ctrl->queue_count - 1);
-		nvme_unfreeze(ctrl);
 	}
 
+	if (!new)
+		nvme_unfreeze(ctrl);
+
 	ret = nvme_tcp_start_io_queues(ctrl);
 	if (ret)
 		goto out_cleanup_connect_q;
-- 
2.29.2