linux-kernel - Re: 2.6.29-rc libata sff 32bit PIO regression

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Message-ID: <498977C2.3020305@ru.mvista.com>
Date:	Wed, 04 Feb 2009 14:10:58 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Hugh Dickins <hugh@...itas.com>, Jeff Garzik <jgarzik@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29-rc libata sff 32bit PIO regression

Hello.

Alan Cox wrote:
>> [PATCH] libata sff: 32bit PIO use 16bit on slop
>>
>> 871af1210f13966ab911ed2166e4ab2ce775b99d libata: Add 32bit PIO support
>> causes errors on a four-year-old ata_piix Dell Precision 670.  Using
>> 16bit PIO instead of 32bit PIO on the odd 1, 2 or 3 chars fixes that.
>>
>> Signed-off-by: Hugh Dickins <hugh@...itas.com>
>>     
>
> For the 3 bytes of slop it should use a single iowrite32 but otherwise
> that seems ok.

   I'm not really sure what this would achieve but I can post a patch 
implementing this (based on my suggestion to Hugh).

MBR, Sergei


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