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

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Message-ID: <896748.37554.qm@web36708.mail.mud.yahoo.com>
Date:	Sat, 19 Apr 2008 19:34:12 -0700 (PDT)
From:	Alex Dubov <oakad@...oo.com>
To:	Pierre Ossman <drzeus-list@...eus.cx>,
	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>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] MMC multiwrite capability removal


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

> Hi everyone,
> 
> I've been planning to remove the MMC multiwrite capability (making it
> always on), but I need some help from all you driver maintainers first.
> 
> Ages ago, I had a chat with Axboe about the current situation and it
> turns out that the MMC layer is a bit over-cautious. There are plenty
> of other block devices that cannot report anything more than
> success/failure for the whole request. So it's silly that we're
> crippling the MMC layer when upper layers have to deal with that
> scenario anyway.
> 
> What I need from you is and audit of your respective driver(s) and
> check that they do not overestimate the number of successfully written
> blocks. Please send a short reply even if your driver needs no changes.
> 

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.




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