linux-kernel - Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support properly

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Message-ID: <20081219105013.0e43c364@lxorguk.ukuu.org.uk>
Date:	Fri, 19 Dec 2008 10:50:13 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Jeff Garzik <jeff@...zik.org>,
	Mario Schwalbe <schwalbe@....tu-dresden.de>,
	linux-kernel@...r.kernel.org,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O
 support properly

> Sure, we can always improve things further later.  However Mario's patch
> is _definitely_ an improvement over the _current_ code.  Don't you agree?

No actually I don't. The current head dev code checks ATA > 7 as the
indicator that this bit is used for treacherous computing. That means the
behaviour for all the older drives is clearly back compatible with old
Linux behaviour.

Doing it that way around means we don't have any worries about changing
existing behaviours.
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