1 files changed, 30 insertions, 9 deletions

diff --git a/src/core/interface.c b/src/core/interface.c
index f0c0ae643..c69875ea6 100644
--- a/src/core/interface.c
+++ b/src/core/interface.c
@@ -151,29 +151,50 @@ static struct interface * intf_get_passthru ( struct interface *intf ) {
 }
 
 /**
- * Get object interface destination and operation method
+ * Get object interface destination and operation method (without pass-through)
  *
  * @v intf		Object interface
  * @v type		Operation type
  * @ret dest		Destination interface
  * @ret func		Implementing method, or NULL
  */
-void * intf_get_dest_op_untyped ( struct interface *intf, void *type,
-				  struct interface **dest ) {
+void * intf_get_dest_op_no_passthru_untyped ( struct interface *intf,
+					      void *type,
+					      struct interface **dest ) {
 	struct interface_descriptor *desc;
 	struct interface_operation *op;
 	unsigned int i;
 
+	*dest = intf_get ( intf->dest );
+	desc = (*dest)->desc;
+	for ( i = desc->num_op, op = desc->op ; i ; i--, op++ ) {
+		if ( op->type == type )
+			return op->func;
+	}
+
+	return NULL;
+}
+
+/**
+ * Get object interface destination and operation method
+ *
+ * @v intf		Object interface
+ * @v type		Operation type
+ * @ret dest		Destination interface
+ * @ret func		Implementing method, or NULL
+ */
+void * intf_get_dest_op_untyped ( struct interface *intf, void *type,
+				  struct interface **dest ) {
+	void *func;
+
 	while ( 1 ) {
+
 		/* Search for an implementing method provided by the
 		 * current destination interface.
 		 */
-		*dest = intf_get ( intf->dest );
-		desc = (*dest)->desc;
-		for ( i = desc->num_op, op = desc->op ; i ; i--, op++ ) {
-			if ( op->type == type )
-				return op->func;
-		}
+		func = intf_get_dest_op_no_passthru_untyped( intf, type, dest );
+		if ( func )
+			return func;
 
 		/* Pass through to the underlying interface, if applicable */
 		if ( ! ( intf = intf_get_passthru ( *dest ) ) )