linux-kernel - Re: [PATCH] mmc_spi: do propper retry managment in the block layer

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Message-Id: <200905061145.30698.wolfgang.mues@auerswald.de>
Date:	Wed, 6 May 2009 11:45:30 +0200
From:	Wolfgang Mües <wolfgang.mues@...rswald.de>
To:	Pierre Ossman <pierre@...man.eu>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Matt Fleming" <matt@...sole-pimps.org>,
	"David Brownell" <dbrownell@...rs.sourceforge.net>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc_spi: do propper retry managment in the block layer

Pierre,

Am Dienstag, 28. April 2009 schrieb Pierre Ossman:
> You're wrong in that EINVAL should not be sent for any kind of runtime
> hardware errors like that. But I might have missed some instances during
> reviews, so there might be drivers that give that error message for
> things they shouldn't.

I checked the drivers sourcecode and found that most drivers are using EINVAL 
for non-recoverable parameter errors.

The only driver which uses EINVAL for errors which might result from 
transmission failures is mmc_spi.

So I think it would be OK to use another error code in mmc_spi for these 
cases:

 * EILSEQ       Basic format problem with the received or sent data
 *              (e.g. CRC check failed, incorrect opcode in response
 *              or bad end bit)

Would you accept a patch to report another error code in mmc_spi?

regards

i. A. Wolfgang Mües
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