linux-kernel - Re: [REPOST PATCH] sata_promise: use TF interface for polling NODATA commands

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Message-ID: <20070607172507.GB11882@havoc.gtf.org>
Date:	Thu, 7 Jun 2007 13:25:07 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Tejun Heo <htejun@...il.com>, Mikael Pettersson <mikpe@...uu.se>,
	akpm@...ux-foundation.org, david@...eaves.com,
	jean.luc.coulon@...il.com, jgarzik@...ox.com,
	michal.k.k.piotrowski@...il.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [REPOST PATCH] sata_promise: use TF interface for polling NODATA commands

On Thu, Jun 07, 2007 at 01:20:13PM -0400, Chuck Ebbert wrote:
> On 06/06/2007 12:05 PM, Jeff Garzik wrote:
> > FYI to all -- 
> > 
> > As a reminder. the Promise hardware programs registers when it receives
> > a SET FEATURES - XFER MODE.
> > 
> > If data transfer is occurring on OTHER ports at the time this is issued,
> > then data corruption is guaranteed to occur.  Polling will not fix this
> > problem -- all ports need to be inactive, when a SET FEATURES - XFER
> > MODE command is issued for any port.

> So is this patch OK but yet more work needs to be done, or does
> this patch cause new problems?

Causes no /new/ problems...  :)  The existing problem described above
remains.

	Jeff



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