From e7cce67f27bce49d8b6d09f4e66059d1fd117ebb Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 2 May 2012 13:30:54 +0200
Subject: [PATCH] qom: Add object_class_get_parent()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This simple bit of functionality was missing and we'll need it soon,
so add it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
[AF: Document possible NULL return value]
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 include/qemu/object.h |  8 ++++++++
 qom/object.c          | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/qemu/object.h b/include/qemu/object.h
index d93b77293f..487559c5c0 100644
--- a/include/qemu/object.h
+++ b/include/qemu/object.h
@@ -547,6 +547,14 @@ ObjectClass *object_class_dynamic_cast_assert(ObjectClass *klass,
 ObjectClass *object_class_dynamic_cast(ObjectClass *klass,
                                        const char *typename);
 
+/**
+ * object_class_get_parent:
+ * @klass: The class to obtain the parent for.
+ *
+ * Returns: The parent for @klass or %NULL if none.
+ */
+ObjectClass *object_class_get_parent(ObjectClass *klass);
+
 /**
  * object_class_get_name:
  * @klass: The class to obtain the QOM typename for.
diff --git a/qom/object.c b/qom/object.c
index 6f839ad8c9..9582230879 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -545,6 +545,19 @@ ObjectClass *object_class_by_name(const char *typename)
     return type->class;
 }
 
+ObjectClass *object_class_get_parent(ObjectClass *class)
+{
+    TypeImpl *type = type_get_parent(class->type);
+
+    if (!type) {
+        return NULL;
+    }
+
+    type_initialize(type);
+
+    return type->class;
+}
+
 typedef struct OCFData
 {
     void (*fn)(ObjectClass *klass, void *opaque);