ide: constify struct ide_port_info

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/pci/atiixp.c b/drivers/ide/pci/atiixp.c
index 05972ff..ef8e016 100644
--- a/drivers/ide/pci/atiixp.c
+++ b/drivers/ide/pci/atiixp.c
@@ -189,7 +189,7 @@
 	hwif->dma_host_off = &atiixp_dma_host_off;
 }
 
-static struct ide_port_info atiixp_pci_info[] __devinitdata = {
+static const struct ide_port_info atiixp_pci_info[] __devinitdata = {
 	{	/* 0 */
 		.name		= "ATIIXP",
 		.init_hwif	= init_hwif_atiixp,