ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/it8213.c b/drivers/ide/pci/it8213.c
index 52e403f..90b52ed 100644
--- a/drivers/ide/pci/it8213.c
+++ b/drivers/ide/pci/it8213.c
@@ -193,7 +193,7 @@
 		.udma_mask	= ATA_UDMA6,		\
 	}
 
-static struct ide_port_info it8213_chipsets[] __devinitdata = {
+static const struct ide_port_info it8213_chipsets[] __devinitdata = {
 	/* 0 */ DECLARE_ITE_DEV("IT8213"),
 };