From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: libata dev_config call order wrong.
Date: Sun, 29 Aug 2004 19:59:55 +0100
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To: Jeff Garzik <jgarzik@pobox.com>
Cc: Brad Campbell <brad@wasp.net.au>, linux-ide@vger.kernel.org, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

On Sul, 2004-08-29 at 19:25, Jeff Garzik wrote:
> According to the Serial ATA docs, IDENTIFY DEVICE word 93 will be zero 
> if it's Serial ATA.  Who knows if that's true, given the wierd wild 
> world of ATA devices.

You need to check if word 93 is valid first. Same with things like the
cache control word - its value is only meaningful if the drive says the
word is meaningful.