linux-kernel - Re: [PATCH] Revert "blk-mq: issue directly if hw queue isn't busy in case of 'none'"

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Date:   Tue, 28 Aug 2018 10:13:50 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Ian W MORRISON <ianwmorrison@...il.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kashyap.desai@...adcom.com, loberman@...hat.com, osandov@...com,
        hch@....de, bart.vanassche@....com, hare@...e.de,
        ming.lei@...hat.com
Subject: Re: [PATCH] Revert "blk-mq: issue directly if hw queue isn't busy in
 case of 'none'"

On 8/28/18 10:10 AM, Ian W MORRISON wrote:
> On Wed, 29 Aug 2018 at 02:09, Jens Axboe <axboe@...nel.dk> wrote:
>>
>> On 8/28/18 10:07 AM, Ian W MORRISON wrote:
>>> On Wed, 29 Aug 2018 at 01:48, Jens Axboe <axboe@...nel.dk> wrote:
>>>>
>>>> On 8/28/18 9:47 AM, Ian W MORRISON wrote:
>>>>> Kernel oops when booting on Bay and Cherry Trail devices
>>>>> such as Intel Compute Stick. Bisected as:
>>>>>
>>>>> commit 6ce3dd6eec11 ("blk-mq: issue directly if hw queue isn't busy in case of 'none'")
>>>>>
>>>>> This patch reverts the above commit.
>>>>
>>>> Did I miss the posting of that oops? Just curious where this is
>>>> going wrong. Not adverse to reverting, but I'd like to try to
>>>> understand the issue first.
>>>>
>>>> --
>>>> Jens Axboe
>>>>
>>>
>>> I've not been able to capture it however manually transcribing what is
>>> on the screen:
>>>
>>> mmc0: Got data interrupt 0x00000002 even though no data operation
>>>
>>> followed by:
>>>
>>> mmc0: sdhci: ============= SDHCI REGISTER DUMP ==============
>>>
>>> Do you want any specific register value or should I transcribe each
>>> (as I am working from an image taken at boot)?
>>
>> Just take a picture of the screen, that should be good enough.
>>
>> --
>> Jens Axboe
>>
> 
> Attached as requested.

Can you see if this patch helps?

https://marc.info/?l=linux-mmc&m=153485326025301&w=2

-- 
Jens Axboe