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 10:09:12 -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 10:07 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