ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/jmicron.c b/drivers/ide/pci/jmicron.c
index f7fcc3b..bdf64d9 100644
--- a/drivers/ide/pci/jmicron.c
+++ b/drivers/ide/pci/jmicron.c
@@ -118,7 +118,7 @@
 		hwif->cbl = ata66_jmicron(hwif);
 }
 
-static struct ide_port_info jmicron_chipset __devinitdata = {
+static const struct ide_port_info jmicron_chipset __devinitdata = {
 	.name		= "JMB",
 	.init_hwif	= init_hwif_jmicron,
 	.host_flags	= IDE_HFLAG_BOOTABLE,