ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/cy82c693.c b/drivers/ide/pci/cy82c693.c
index c1adc1b..3ef4fc1 100644
--- a/drivers/ide/pci/cy82c693.c
+++ b/drivers/ide/pci/cy82c693.c
@@ -448,7 +448,7 @@
 	}
 }
 
-static struct ide_port_info cy82c693_chipset __devinitdata = {
+static const struct ide_port_info cy82c693_chipset __devinitdata = {
 	.name		= "CY82C693",
 	.init_chipset	= init_chipset_cy82c693,
 	.init_iops	= init_iops_cy82c693,