diff --git a/[refs] b/[refs]
index bdab8c038201..7d5bfeca4530 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6be4173b02f85fa3d2f8610b79ea276eea86c3ac
+refs/heads/master: 6c39eed00cb28d4997ddf3a7aa96a1aff48c8828
diff --git a/trunk/drivers/staging/comedi/drivers/comedi_fc.h b/trunk/drivers/staging/comedi/drivers/comedi_fc.h
index 1f0839171887..94481c637a0a 100644
--- a/trunk/drivers/staging/comedi/drivers/comedi_fc.h
+++ b/trunk/drivers/staging/comedi/drivers/comedi_fc.h
@@ -93,4 +93,16 @@ static inline int cfc_check_trigger_src(unsigned int *src, unsigned int flags)
 	return 0;
 }
 
+/**
+ * cfc_check_trigger_is_unique() - make sure a trigger source is unique
+ * @src: the trigger source to check
+ */
+static inline int cfc_check_trigger_is_unique(unsigned int src)
+{
+	/* this test is true if more than one _src bit is set */
+	if ((src & (src - 1)) != 0)
+		return -EINVAL;
+	return 0;
+}
+
 #endif /* _COMEDI_FC_H */