linux-kernel - Re: [PATCH v4 8/8] nvme-rdma: Unfreeze queues on reconnect

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Date:   Fri, 6 Aug 2021 12:59:15 -0700
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Daniel Wagner <dwagner@...e.de>, 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>, Hannes Reinecke <hare@...e.de>,
        Wen Xiong <wenxiong@...ibm.com>
Subject: Re: [PATCH v4 8/8] nvme-rdma: Unfreeze queues on reconnect


> During the queue teardown in nvme_rdma_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: 9f98772ba307 ("nvme-rdma: fix controller reset hang during traffic")
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/host/rdma.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
> index de2a8950d282..21a8a5353af0 100644
> --- a/drivers/nvme/host/rdma.c
> +++ b/drivers/nvme/host/rdma.c
> @@ -901,6 +901,8 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
>   			error = PTR_ERR(ctrl->ctrl.admin_q);
>   			goto out_cleanup_fabrics_q;
>   		}
> +	} else {
> +		nvme_unfreeze(&ctrl->ctrl);

That seems misplaced.. unfreezing the I/O queues when setting up the 
admin queue?