[libata ata_piix] Fix ICH6/7 map value interpretation

The previous change failed to properly mask out unrelated bits, which
resulted in a failure to detect devices.

diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
index 19d8d4b..2d984b0 100644 (file)
--- a/drivers/scsi/ata_piix.c
+++ b/drivers/scsi/ata_piix.c
@@ -713,7 +713,7 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
                pci_read_config_byte(pdev, ICH5_PMR, &tmp);
 
                if (host_flags & PIIX_FLAG_COMBINED_ICH6) {
-                       switch (tmp) {
+                       switch (tmp & 0x3) {
                        case 0:
                                break;
                        case 1: