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

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Date:	Wed, 13 Aug 2014 06:38:27 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	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

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?

-Doug
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