hw/core/sysbus: Add a function for creating and attaching an object

A lot of functions are initializing an object and attach it immediately
afterwards to the system bus. Provide a common function for this, which
also uses object_initialize_child() to make sure that the reference
counter is correctly initialized to 1 afterwards.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1531745974-17187-3-git-send-email-thuth@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index ecfb0cfc0e..3c8e53b188 100644
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -376,6 +376,14 @@ BusState *sysbus_get_default(void)
     return main_system_bus;
 }
 
+void sysbus_init_child_obj(Object *parent, const char *childname, void *child,
+                           size_t childsize, const char *childtype)
+{
+    object_initialize_child(parent, childname, child, childsize, childtype,
+                            &error_abort, NULL);
+    qdev_set_parent_bus(DEVICE(child), sysbus_get_default());
+}
+
 static void sysbus_register_types(void)
 {
     type_register_static(&system_bus_info);