linux-kernel - Re: [PATCH 2/2] usb: host: xhci: Handle the right timeout command

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Date:   Wed, 21 Dec 2016 15:00:54 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        "Lu, Baolu" <baolu.lu@...el.com>
Subject: Re: [PATCH 2/2] usb: host: xhci: Handle the right timeout command

On 21.12.2016 04:22, Baolin Wang wrote:
> Hi Mathias,
>
> On 20 December 2016 at 23:13, Mathias Nyman
> <mathias.nyman@...ux.intel.com> wrote:
>> On 20.12.2016 09:30, Baolin Wang wrote:
>> ...
>>
>> Alright, I gathered all current work related to xhci races and timeouts
>> and put them into a branch:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git
>> timeout_race_fixes
>>
>> Its based on 4.9
>> It includes a few other patches just to avoid conflicts and  make my life
>> easier
>>
>> Interesting patches are:
>>
>> ee4eb91 xhci: remove unnecessary check for pending timer
>> 0cba67d xhci: detect stop endpoint race using pending timer instead of
>> counter.
>> 4f2535f xhci: Handle command completion and timeout race
>> b9d00d7 usb: host: xhci: Fix possible wild pointer when handling abort
>> command
>> 529a5a0 usb: xhci: fix possible wild pointer
>> 4766555 xhci: Fix race related to abort operation
>> de834a3 xhci: Use delayed_work instead of timer for command timeout
>> 69973b8 Linux 4.9
>>
>> The fixes for command queue races will go to usb-linus and stable, the
>> reworks for stop ep watchdog timer will go to usb-next.
>
> How about applying below patch in your 'timeout_race_fixes' branch?
> [PATCH] usb: host: xhci: Clean up commands when stop endpoint command is timeout
> https://lkml.org/lkml/2016/12/13/94
>

usb_hc_died() should eventyally end up calling xhci_mem_cleanup()
which will cleanup the command queue. But I need to look into that

-Mathias