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

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Message-ID: <20080420103019.7c31cb9f@mjolnir.drzeus.cx>
Date:	Sun, 20 Apr 2008 10:30:19 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Alex Dubov <oakad@...oo.com>
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

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.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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