ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index c08416a..49fef84 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -261,7 +261,7 @@
 	hwif->udma_filter = cs5530_udma_filter;
 }
 
-static struct ide_port_info cs5530_chipset __devinitdata = {
+static const struct ide_port_info cs5530_chipset __devinitdata = {
 	.name		= "CS5530",
 	.init_chipset	= init_chipset_cs5530,
 	.init_hwif	= init_hwif_cs5530,