From 4112e16a7c606a80810d22d55bfc742eaa61fecb Mon Sep 17 00:00:00 2001
From: Alan <alan@lxorguk.ukuu.org.uk>
Date: Mon, 8 Jan 2007 12:10:05 +0000
Subject: [PATCH] libata-sff: Don't try and activate channels which are not in
 use

An ATA controller in native mode may have one or more channels disabled
and not assigned resources. In that case the existing code crashes trying
to access I/O ports 0-7.

Add the neccessary check.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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Reading git-format-patch failed