[PATCH] libata: ata_piix.c PIO fix

[patch] libata: ata_piix.c PIO fix

"[libata] transfer mode cleanup" introduced bug in ata_piix.c:
previously PIO number (not mode) was passed to piix_set_piomode().
Fortunately this function is only used for (disabled) PATA support.

I bet that this is the reason why MWDMA didn't work for PATA.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>

drivers/scsi/ata_piix.c

@@ -389,7 +389,7 @@ static void piix_sata_phy_reset(struct ata_port *ap)
 
 static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev)
 {
-	unsigned int pio	= adev->pio_mode;
+	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
 	struct pci_dev *dev	= ap->host_set->pdev;
 	unsigned int is_slave	= (adev->devno != 0);
 	unsigned int master_port= ap->port_no ? 0x42 : 0x40;