linux-kernel - Re: RFC : mmc : Use wait_for_completion_timeout() instead of wait_for_completion in case of multiple write blocks.

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Message-ID: <CAKnu2Mq=4Y=hiv-R7PvPyYCYmo9enu6_FPcoT089LxSa=_xMhw@mail.gmail.com>
Date:	Sat, 3 Sep 2011 22:08:05 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	NamJae Jeon <linkinjeon@...il.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chris Ball <cjb@...top.org>,
	Kyungmin Park <kmpark@...radead.org>,
	Sebastian Rasmussen <Sebastian.Rasmussen@...ricsson.com>,
	Ulf Hansson <Ulf.Hansson@...ricsson.com>
Subject: Re: RFC : mmc : Use wait_for_completion_timeout() instead of
 wait_for_completion in case of multiple write blocks.

2011/9/2 NamJae Jeon <linkinjeon@...il.com>:

> We should consider DMA situation. As I know, host controller can not
> rise timeout interrupt in write not read in DMA status.

Which host controller are you talking about?

> host
> controller can just know whether card is finish to program to use busy
> line. If unstable card is holding busy line while writing using DMA,
> hang problem will happen by wait_for_completion.
> so I think that mmc driver need some exception to avoid this problem.

Yes you can add a timeout in the driver itself. Just set up
a common timer, no big deal.

Yours,
Linus Walleij
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