ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index 9aacc2f..e09742e 100644
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -390,7 +390,7 @@
 		.udma_mask	= udma, \
 	}
 
-static struct ide_port_info pdc202xx_chipsets[] __devinitdata = {
+static const struct ide_port_info pdc202xx_chipsets[] __devinitdata = {
 	{	/* 0 */
 		.name		= "PDC20246",
 		.init_chipset	= init_chipset_pdc202xx,
@@ -421,7 +421,7 @@
  
 static int __devinit pdc202xx_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
-	struct ide_port_info *d;
+	const struct ide_port_info *d;
 	u8 idx = id->driver_data;
 
 	d = &pdc202xx_chipsets[idx];