diff --git a/arch/ppc64/kernel/prom.c b/arch/ppc64/kernel/prom.c
index 45a4ad08fbc2..fe2946c58314 100644
--- a/arch/ppc64/kernel/prom.c
+++ b/arch/ppc64/kernel/prom.c
@@ -321,6 +321,10 @@ static int __devinit finish_node_interrupts(struct device_node *np,
 			char *name = get_property(ic->parent, "name", NULL);
 			if (name && !strcmp(name, "u3"))
 				np->intrs[intrcount].line += 128;
+			else if (!(name && !strcmp(name, "mac-io")))
+				/* ignore other cascaded controllers, such as
+				   the k2-sata-root */
+				break;
 		}
 		np->intrs[intrcount].sense = 1;
 		if (n > 1)