linux-kernel - Re: [RFC] MMC multiwrite capability removal

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Date:	Sun, 20 Apr 2008 07:54:32 -0700 (PDT)
From:	Alex Dubov <oakad@...oo.com>
To:	Pierre Ossman <drzeus-list@...eus.cx>
Cc:	David Brownell <david-b@...bell.net>,
	Andrew Victor <linux@...im.org.za>,
	Pavel Pisa <ppisa@...ron.com>,
	Carlos Aguiar <carlos.aguiar@...t.org.br>,
	Anderson Briglia <briglia.anderson@...il.com>,
	"Syed Mohammed, Khasim" <x0khasim@...com>,
	Russell King <rmk@....linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] MMC multiwrite capability removal


--- Pierre Ossman <drzeus-list@...eus.cx> wrote:

> On Sat, 19 Apr 2008 19:34:12 -0700 (PDT)
> Alex Dubov <oakad@...oo.com> wrote:
> 
> > 
> > tifm_sd relies on controller to report the number of successfully
> transferred
> > blocks. Of course, I cannot be sure to what extent the controller is
> > trustworthy. It worked fine until now, though.
> > 
> 
> Sounds like a perfect example of when we have to report 0 upon
> failures. I suspect most controllers will be like this as all the specs
> I've glanced at lack the detail needed to implement a proper sector
> count.
> 
> The problems caused by reporting incorrect values here are extremely
> rare and difficult to provoke, so normal testing is not likely to
> uncover it.
> 

On the other hand, you may remember that in one of the earlier versions of the
driver I actually counted busy/ready cycles during transfer and from what I
remember, it appeared like controller does the right thing - decrements the
page counter at the "not busy" strobe.



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