From: Greg Felix <gregfelixlkml@gmail.com>
Date: Thu, 28 Jul 2005 19:54:15 +0000 (-0400)
Subject: libata: Check PCI sub-class code before disabling AHCI
X-Git-Tag: v2.6.13-rc5~108^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b6dbd6872ca1d0c03dc0e0a7108d79c8dafa793;p=pandora-kernel.git

libata: Check PCI sub-class code before disabling AHCI

This patch adds functionality to check the PCI sub-class code of an
AHCI capable device before disabling AHCI.  It fixes a bug where an
ICH7 sata controller is being setup by the BIOS as sub-class 1 (ide)
and the AHCI control registers weren't being initialized, thus causing
an IO error in piix_disable_ahci().

Signed-off-by: Gregory Felix <greg.felix@gmail.com>
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