linux-kernel - Re: [PATCH] mmc_spi: use EILSEQ for possible transmission errors

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Message-ID: <20090525134823.3ab040dd@mjolnir.ossman.eu>
Date:	Mon, 25 May 2009 13:48:23 +0200
From:	Pierre Ossman <pierre@...man.eu>
To:	David Brownell <david-b@...bell.net>
Cc:	Wolfgang Mües <wolfgang.mues@...rswald.de>,
	"Matt Fleming" <matt@...sole-pimps.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc_spi: use EILSEQ for possible transmission errors

On Wed, 20 May 2009 19:02:51 -0700
David Brownell <david-b@...bell.net> wrote:

> On Wednesday 20 May 2009, Pierre Ossman wrote:
> > >		 Remember that the
> > > firmware in the card can leverage "that's erased" knowledge for
> > > things like wear leveling.  SSDs and other storage devices would
> > > likewise benefit from such knowledge.  I'm quite certain there's
> > > been discussion about adding support for that in the block layer.
> > 
> > It's already in AFAIK. I even had code for hooking it up to mmc_block.
> > But it didn't produce any measurable results so I never merged it.
> 
> I'd expect the results would take time to show.  As in, they would
> facilitate wear leveling logic, which may be difficult to measure
> except by testing various cards to destruction ... even for vendors
> that *do* have decent wear leveling.  :)
> 

Who are these mythical decent vendors you speak of? ;)

Seriously though, the modifications to mmc_block can still be found
here if anyone wants to play with it:

http://git.infradead.org/users/drzeus/discard-2.6.git

I haven't checked if it still applies to the current version of the
kernel though, so you're on your own. ;)

Rgds
-- 
     -- Pierre Ossman

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