linux-kernel - Re: [PATCH 2/2] nvme-fc: Wait with a timeout for queue to freeze

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Message-ID: <aef60901-b1d0-0499-211c-b87dc0745e2d@suse.de>
Date:   Tue, 29 Jun 2021 14:31:49 +0200
From:   Hannes Reinecke <hare@...e.de>
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>, Jens Axboe <axboe@...com>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH 2/2] nvme-fc: Wait with a timeout for queue to freeze

On 6/25/21 12:16 PM, Daniel Wagner wrote:
> Do not wait indifinitly for all queues to freeze. Instead use a
> timeout and abort the operation if we get stuck.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/host/fc.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> index a9645cd89eca..d8db85aa5417 100644
> --- a/drivers/nvme/host/fc.c
> +++ b/drivers/nvme/host/fc.c
> @@ -2955,7 +2955,14 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
>   		dev_info(ctrl->ctrl.device,
>   			"reconnect: revising io queue count from %d to %d\n",
>   			prior_ioq_cnt, nr_io_queues);
> -		nvme_wait_freeze(&ctrl->ctrl);
> +		if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) {
> +			/*
> +			 * If we timed out waiting for freeze we are likely to
> +			 * be stuck.  Fail the controller initialization just
> +			 * to be safe.
> +			 */
> +			return -ENODEV;
> +		}
>   		blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
>   		nvme_unfreeze(&ctrl->ctrl);
>   	}
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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