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

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Date:	Wed, 10 Jun 2009 08:37:49 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Wolfgang Mües <wolfgang.mues@...rswald.de>
Cc:	Pierre Ossman <pierre@...man.eu>,
	David Brownell <david-b@...bell.net>,
	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, Jun 10, 2009 at 09:29:49AM +0200, Wolfgang Mües wrote:
> 
> From: Wolfgang Muees <wolfgang.mues@...rswald.de>
> 
> o This patch changes the reported error code for the responses
>   to a command from EINVAL to EFAULT/ENOSYS, as EINVAL is reserved
>   for non-recoverable host errors, and the responses from
>   the SD/MMC card may be because of recoverable transmission
>   errors in the command or in the response. Response codes
>   in SPI mode are NOT protected by a checksum, so don't trust them.
> 
> This is a revised, minimal-invasive patch version. As Pierre Ossman
> pointed out, EINVAL should only be used for non-recoverable errors
> (and is used so in the whole rest of the mmc framework).
> 
> I have checked every instance of EINVAL in the mmc framework - no 
> changes were needed here. 
> 
> This patch is neccessary for doing a sensible retry managment in the 
> mmmc block layer (patch will follow).
> 
> Signed-off-by: Wolfgang Muees <wolfgang.mues@...rswald.de>

Nice patch Wolfgang and well done for sticking this out ;-)

FWIW,
Acked-by: Matt Fleming <matt@...sole-pimps.org>
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