linux-kernel - Re: [PATCH V5 0/2] nvme-pci: fix the timeout case when reset is ongoing

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Date:   Sat, 20 Jan 2018 22:14:51 +0800
From:   "jianchao.wang" <jianchao.w.wang@...cle.com>
To:     Keith Busch <keith.busch@...el.com>
Cc:     axboe@...com, hch@....de, sagi@...mberg.me, maxg@...lanox.com,
        james.smart@...adcom.com, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 0/2] nvme-pci: fix the timeout case when reset is
 ongoing



On 01/20/2018 10:07 PM, jianchao.wang wrote:
> Hi Keith
> 
> Thanks for you kindly response.
> 
> On 01/20/2018 10:11 AM, Keith Busch wrote:
>> On Fri, Jan 19, 2018 at 09:56:48PM +0800, jianchao.wang wrote:
>>> In nvme_dev_disable, the outstanding requests will be requeued finally.
>>> I'm afraid the requests requeued on the q->requeue_list will be blocked until another requeue
>>> occurs, if we cancel the requeue work before it get scheduled.
>>
>> We should kick the request list in nvme_start_queues.
>>
> Yes
> 
> @@ -3513,8 +3513,10 @@ void nvme_start_queues(struct nvme_ctrl *ctrl)
>         struct nvme_ns *ns;
>  
>         mutex_lock(&ctrl->namespaces_mutex);
> -       list_for_each_entry(ns, &ctrl->namespaces, list)
> +       list_for_each_entry(ns, &ctrl->namespaces, list) {
>                 blk_mq_unquiesce_queue(ns->queue);
> +               blk_mq_kick_requeue_list(ns->queue);
> +       }
>         mutex_unlock(&ctrl->namespaces_mutex);
>  }

We have to also add blk_mq_kick_requeue_list in nvme_kill_queues in case of queue_count < 2.

> 
> Then, nvme_sync_queues could be more universal.
> 
> Many thanks for your directive.
> 
> Jianchao
>