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Date:	Thu, 27 Sep 2007 23:52:18 -0400
From:	Mark Lord <lkml@....ca>
To:	Tejun Heo <htejun@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Mark Lord <liml@....ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	michal.k.k.piotrowski@...il.com, bryan@...ores.ca,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: Stardom SATA HSM violation

Tejun Heo wrote:
> Alan Cox wrote:
>>> I think there have been enough cases where this draining was necessary.
>>>  IIRC, ata_piix was involved in those cases, right?  If so, can you
>>> please submit a patch which applies this only to affected controllers?
>>> I don't feel too confident about applying this to all SFF controllers.
>> Old IDE does it on all controllers bar a couple. So we have a very good
>> knowledge of what does/doesn't work. The one that needs care in old ide
>> is an ordering issue where a state machine reset done first causes the
>> drain of the I/O to hang.
> 
> Hmmm... So, do we apply draining to all PATA?  Or is ata_piix SATA
> affected too?

ata_piix SATA is definitely affected when a PATA_drive to SATA_host bridge is present.
Possibly other times.

Cheers

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