linux-kernel - Re: [PATCH v2 5/5] nvme-fc: Freeze queues before destroying them

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Date:   Thu, 8 Jul 2021 12:14:11 +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 v2 5/5] nvme-fc: Freeze queues before destroying them

On 7/8/21 11:27 AM, Daniel Wagner wrote:
> nvme_wait_freeze_timeout() in nvme_fc_recreate_io_queues() needs to be
> paired with a nvme_start_freeze(). Without freezing first we will always
> timeout in nvme_wait_freeze_timeout().
> 
> Note there is a similiar fix for RDMA 9f98772ba307 ("nvme-rdma: fix
> controller reset hang during traffic") which happens to follow the PCI
> strategy how to handle resetting the queues.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/host/fc.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> index 8e1fc3796735..a38b01485939 100644
> --- a/drivers/nvme/host/fc.c
> +++ b/drivers/nvme/host/fc.c
> @@ -3249,6 +3249,7 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl)
>   		nvme_fc_xmt_ls_rsp(disls);
>   
>   	if (ctrl->ctrl.tagset) {
> +		nvme_start_freeze(&ctrl->ctrl);
>   		nvme_fc_delete_hw_io_queues(ctrl);
>   		nvme_fc_free_io_queues(ctrl);
>   	}
> 
Please add a comment here about the pairing. We've missed it once, so we 
should make it clear why it has to be placed here.

Cheers,

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