[Qemu-devel] [PATCH 04/11] qdev: add reference count to a device for the BusChild

[Paolo Bonzini <pbonzini@redhat.com>]

Each device has a reference through the BusChild.  This reference
was not accounted for, add it now.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/qdev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/qdev.c b/hw/qdev.c
index e758131..87dfcb5 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -65,7 +65,10 @@ static void bus_remove_child(BusState *bus, DeviceState *child)
 
             snprintf(name, sizeof(name), "child[%d]", kid->index);
             QTAILQ_REMOVE(&bus->children, kid, sibling);
+
+            /* This gives back ownership of kid->child back to us.  */
             object_property_del(OBJECT(bus), name, NULL);
+            object_unref(OBJECT(kid->child));
             g_free(kid);
             return;
         }
@@ -83,9 +86,11 @@ static void bus_add_child(BusState *bus, DeviceState *child)
 
     kid->index = bus->max_index++;
     kid->child = child;
+    object_ref(OBJECT(kid->child));
 
     QTAILQ_INSERT_HEAD(&bus->children, kid, sibling);
 
+    /* This transfers ownership of kid->child to the property.  */
     snprintf(name, sizeof(name), "child[%d]", kid->index);
     object_property_add_link(OBJECT(bus), name,
                              object_get_typename(OBJECT(child)),
-- 
1.8.0.1