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

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Date:	Mon, 25 May 2009 12:18:18 +0200
From:	Wolfgang Mües <wolfgang.mues@...rswald.de>
To:	"David Brownell" <david-b@...bell.net>
Cc:	"Pierre Ossman" <pierre@...man.eu>,
	"Matt Fleming" <matt@...sole-pimps.org>,
	"Pierre Ossman" <drzeus@...eus.cx>,
	"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

David,

Am Montag, 25. Mai 2009 schrieb David Brownell:
> It can't.  But when the card controller knows that for example
> certain logical blocks are not holding data, it can use that
> for wear leveling ... it's got more physical blocks to use to
> even out the writes, as well as having any records it kept on
> writes, reads, and erasures.

OK. So the block layer is issuing erase commands for all sectors which get 
unused, to let the mmc/sd card controller know that these areas are unused.

Are these erase commands requests (as reads and writes)? I suppose...

So if this code gets integrated, we can do:

if (command is erase)
	accept erase response codes
else
	treat erase response codes as transmission errors

Should be no problem...

regards
 
i. A. Wolfgang Mües
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