linux-kernel - Re: [PATCH] libata ATAPI transfer size cleanups

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Message-ID: <20071101094344.6eb9d8bc@the-village.bc.nu>
Date:	Thu, 1 Nov 2007 09:43:44 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libata ATAPI transfer size cleanups

On Thu, 1 Nov 2007 05:07:33 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> 
> This is purely for comment and testing, not for merging (yet?).
> 
> A common recipe in several vendor drivers (either GPL'd, or I have NDA'd
> access to use them as a documentation-like reference) for ATAPI was
> slightly different from ours.  This recipe can be found in
> atapi_tf_xfer_size(), and it's slightly different from Alan's.

Looks mostly good. Might cause breakage on one or two controllers by
setting lbam/lbah to 0 for DMA but we can test that and find out.

Note however - the scheme in use now has been tested for over ten years
in drivers/ide. The scheme below has not...

Having an ata_tf_xfer_size method is definitely a good idea whatever
methods we eventually decide on.
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