ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index be54f4f..a728031 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -366,7 +366,7 @@
 	}
 }
 
-static struct ide_port_info serverworks_chipsets[] __devinitdata = {
+static const struct ide_port_info serverworks_chipsets[] __devinitdata = {
 	{	/* 0 */
 		.name		= "SvrWks OSB4",
 		.init_chipset	= init_chipset_svwks,