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libata: Check PCI sub-class code before disabling AHCI
authorGreg Felix <gregfelixlkml@gmail.com>
Thu, 28 Jul 2005 19:54:15 +0000 (15:54 -0400)
committerJeff Garzik <jgarzik@pobox.com>
Thu, 28 Jul 2005 19:54:15 +0000 (15:54 -0400)
commit7b6dbd6872ca1d0c03dc0e0a7108d79c8dafa793
tree54160c4c0aa0970d3daa8b9a8f40c7a31f9527fetree | snapshot (tar.gz zip)
parent6b6a93c6876ea1c530d5d3f68e3678093a27fab0commit | diff
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>
drivers/scsi/ata_piix.c diff | blob | blame | history