libata: Check PCI sub-class code before disabling AHCI

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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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Greg Felix 2005-07-28 15:54:15 -04:00 • committed by Jeff Garzik

parent 6b6a93c687

commit 7b6dbd6872

1 changed files with 13 additions and 6 deletions

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19

drivers/scsi/ata_piix.c

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