netdev - Re: [PATCH 1/3] can: flexcan: fix deadlock when using self wakeup

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Date:   Fri, 15 Nov 2019 10:07:20 +0100
From:   Sean Nyekjaer <sean@...nix.com>
To:     Joakim Zhang <qiangqing.zhang@....com>,
        "mkl@...gutronix.de" <mkl@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Cc:     dl-linux-imx <linux-imx@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/3] can: flexcan: fix deadlock when using self wakeup



On 15/11/2019 10.06, Joakim Zhang wrote:
> 
>> -----Original Message-----
>> From: Sean Nyekjaer <sean@...nix.com>
>> Sent: 2019年11月15日 16:54
>> To: Joakim Zhang <qiangqing.zhang@....com>; mkl@...gutronix.de;
>> linux-can@...r.kernel.org
>> Cc: dl-linux-imx <linux-imx@....com>; netdev@...r.kernel.org
>> Subject: Re: [PATCH 1/3] can: flexcan: fix deadlock when using self wakeup
>>
>>
>>
>> On 15/11/2019 06.09, Joakim Zhang wrote:
>>>
>>> Hi Sean,
>>>
>>> I remember that you are the first one sending out the patch to fix this issue,
>> and I NACK the patch before.
>>> I am so sorry for that, it can work fine after testing at my side.
>>> Could you help double check at your side for this patch? Both wakeup from
>> totally suspend and wakeup from suspending?
>>>
>>> With this patch, we can fix two problems:
>>> 1) fix deadlock when using self wakeup
>>> 2) frames out-of-order in first IRQ handler run after wakeup
>>>
>>> Thanks a lot!
>>>
>>> Best Regards,
>>> Joakim Zhang
>>
>> Hi Joakim,
>>
>>
>>
>> We are mostly listening for broadcast packages, so we haven't noticed frames
>> out-of-order :-)
> 
> Okay, I have discussed with Marc before, this could be possible. You can test with two boards, one receive and another transmit.
>>
>>
>> I have checked this series, it comes out of suspend every time :-)
> 
> I am not quite understand, could you explain more, this patch cannot fix deadlock issue?

It fixes the deadlock issue :)
> 
> Best Regards,
> Joakim Zhang
>> /Sean
>