pata_atiixp: add proper ->prereset method

Fixes PCI access before PCI resources are allocated.

Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/pata_atiixp.c

@@ -48,6 +48,31 @@ static int atiixp_cable_detect(struct ata_port *ap)
 
 static DEFINE_SPINLOCK(atiixp_lock);
 
+/**
+ *	atiixp_prereset	-	perform reset handling
+ *	@link: ATA link
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Reset sequence checking enable bits to see which ports are
+ *	active.
+ */
+
+static int atiixp_prereset(struct ata_link *link, unsigned long deadline)
+{
+	static const struct pci_bits atiixp_enable_bits[] = {
+		{ 0x48, 1, 0x01, 0x00 },
+		{ 0x48, 1, 0x08, 0x00 }
+	};
+
+	struct ata_port *ap = link->ap;
+	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+	if (!pci_test_config_bits(pdev, &atiixp_enable_bits[ap->port_no]))
+		return -ENOENT;
+
+	return ata_sff_prereset(link, deadline);
+}
+
 /**
  *	atiixp_set_pio_timing	-	set initial PIO mode data
  *	@ap: ATA interface
@@ -221,6 +246,7 @@ static struct ata_port_operations atiixp_port_ops = {
 	.bmdma_start 	= atiixp_bmdma_start,
 	.bmdma_stop	= atiixp_bmdma_stop,
 
+	.prereset	= atiixp_prereset,
 	.cable_detect	= atiixp_cable_detect,
 	.set_piomode	= atiixp_set_piomode,
 	.set_dmamode	= atiixp_set_dmamode,
@@ -235,16 +261,7 @@ static int atiixp_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		.udma_mask = ATA_UDMA5,
 		.port_ops = &atiixp_port_ops
 	};
-	static const struct pci_bits atiixp_enable_bits[] = {
-		{ 0x48, 1, 0x01, 0x00 },
-		{ 0x48, 1, 0x08, 0x00 }
-	};
 	const struct ata_port_info *ppi[] = { &info, &info };
-	int i;
-
-	for (i = 0; i < 2; i++)
-		if (!pci_test_config_bits(pdev, &atiixp_enable_bits[i]))
-			ppi[i] = &ata_dummy_port_info;
 
 	return ata_pci_bmdma_init_one(pdev, ppi, &atiixp_sht, NULL,
 				      ATA_HOST_PARALLEL_SCAN);