ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/trm290.c b/drivers/ide/pci/trm290.c
index ed19f0a..5011ba2 100644
--- a/drivers/ide/pci/trm290.c
+++ b/drivers/ide/pci/trm290.c
@@ -319,7 +319,7 @@
 #endif
 }
 
-static struct ide_port_info trm290_chipset __devinitdata = {
+static const struct ide_port_info trm290_chipset __devinitdata = {
 	.name		= "TRM290",
 	.init_hwif	= init_hwif_trm290,
 	.chipset	= ide_trm290,