--- /dev/null
+Index: linux-2.6.38-rc6/drivers/cbus/retu.c
+===================================================================
+--- linux-2.6.38-rc6.orig/drivers/cbus/retu.c 2011-02-27 18:01:26.306458689 +0100
++++ linux-2.6.38-rc6/drivers/cbus/retu.c 2011-02-27 18:05:56.472263901 +0100
+@@ -205,7 +205,7 @@
+ return IRQ_NONE;
+ }
+
+- for (i = 0; idr != 0; i++, idr >>= 1) {
++ for (i = retu->irq_base; idr != 0; i++, idr >>= 1) {
+ if (!(idr & 1))
+ continue;
+