linux-kernel - Re: [PATCH v2] mmc: dw_mmc: Make sure we don't get stuck when we get an error

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Message-id: <53EB6DBA.1080801@samsung.com>
Date:	Wed, 13 Aug 2014 22:52:58 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Doug Anderson <dianders@...omium.org>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Chris Ball <cjb@...top.org>, Sonny Rao <sonnyrao@...omium.org>,
	Grant Grundler <grundler@...omium.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	sunil joshi <joshi@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>,
	Yuvaraj Kumar C D <yuvaraj.cd@...il.com>,
	Chris Ball <chris@...ntf.net>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mmc: dw_mmc: Make sure we don't get stuck when we get
 an error

On 08/13/2014 10:38 PM, Doug Anderson wrote:
> Hi,
> 
> On Wed, May 21, 2014 at 2:08 AM, Seungwon Jeon <tgih.jun@...sung.com> wrote:
>> On Wed, May 21, 2014, Doug Anderson wrote:
>>> If we happened to get a data error at just the wrong time the dw_mmc
>>> driver could get into a state where it would never complete its
>>> request.  That would leave the caller just hanging there.
>>>
>>> We fix this two ways and both of the two fixes on their own appear to
>>> fix the problems we've seen:
>>>
>>> 1. Fix a race in the tasklet where the interrupt setting the data
>>>    error happens _just after_ we check for it, then we get a
>>>    EVENT_XFER_COMPLETE.  We fix this by repeating a bit of code.
>>> 2. Fix it so that if we detect that we've got an error in the "data
>>>    busy" state and we're not going to do anything else we end the
>>>    request and unblock anyone waiting.
>>>
>>> Signed-off-by: Doug Anderson <dianders@...omium.org>
>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@...il.com>
>>
>> It will be applied after "mmc: dw_mmc: change to use recommended reset procedure"
>>
>> Acked-by: Seungwon Jeon <tgih.jun@...sung.com>
>>
>> Thanks,
>> Seungwon Jeon
> 
> I saw that Ulf applied "mmc: dw_mmc: change to use recommended reset
> procedure".  Could we apply this one now, too?  Do you want me to
> repost?
It's good that it will be merged with it.

Best Regards,
Jaehoon Chung

> 
> -Doug
> --
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