nubus-bridge: embed the NubusBus object directly within nubus-bridge

Since nubus-bridge is a container for NubusBus then it should be embedded
directly within the bridge device using qbus_create_inplace().

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210924073808.1041-17-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/m68k/q800.c

@@ -398,7 +398,7 @@ static void q800_init(MachineState *machine)
     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 1, NUBUS_SLOT_BASE +
                     MAC_NUBUS_FIRST_SLOT * NUBUS_SLOT_SIZE);
 
-    nubus = NUBUS_BRIDGE(dev)->bus;
+    nubus = &NUBUS_BRIDGE(dev)->bus;
 
     /* framebuffer in nubus slot #9 */
 

hw/nubus/mac-nubus-bridge.c

@@ -18,19 +18,20 @@ static void mac_nubus_bridge_init(Object *obj)
     MacNubusBridge *s = MAC_NUBUS_BRIDGE(obj);
     NubusBridge *nb = NUBUS_BRIDGE(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    NubusBus *bus = &nb->bus;
 
     /* Macintosh only has slots 0x9 to 0xe available */
-    nb->bus->slot_available_mask = MAKE_64BIT_MASK(MAC_NUBUS_FIRST_SLOT,
-                                                   MAC_NUBUS_SLOT_NB);
+    bus->slot_available_mask = MAKE_64BIT_MASK(MAC_NUBUS_FIRST_SLOT,
+                                               MAC_NUBUS_SLOT_NB);
 
     /* Aliases for slots 0x9 to 0xe */
     memory_region_init_alias(&s->super_slot_alias, obj, "super-slot-alias",
-                             &nb->bus->nubus_mr,
+                             &bus->nubus_mr,
                              MAC_NUBUS_FIRST_SLOT * NUBUS_SUPER_SLOT_SIZE,
                              MAC_NUBUS_SLOT_NB * NUBUS_SUPER_SLOT_SIZE);
 
     memory_region_init_alias(&s->slot_alias, obj, "slot-alias",
-                             &nb->bus->nubus_mr,
+                             &bus->nubus_mr,
                              NUBUS_SLOT_BASE +
                              MAC_NUBUS_FIRST_SLOT * NUBUS_SLOT_SIZE,
                              MAC_NUBUS_SLOT_NB * NUBUS_SLOT_SIZE);

hw/nubus/nubus-bridge.c

@@ -16,8 +16,9 @@
 static void nubus_bridge_init(Object *obj)
 {
     NubusBridge *s = NUBUS_BRIDGE(obj);
+    NubusBus *bus = &s->bus;
 
-    s->bus = NUBUS_BUS(qbus_create(TYPE_NUBUS_BUS, DEVICE(s), NULL));
+    qbus_create_inplace(bus, sizeof(s->bus), TYPE_NUBUS_BUS, DEVICE(s), NULL);
 }
 
 static void nubus_bridge_class_init(ObjectClass *klass, void *data)

include/hw/nubus/nubus.h

@@ -63,7 +63,7 @@ struct NubusDevice {
 struct NubusBridge {
     SysBusDevice parent_obj;
 
-    NubusBus *bus;
+    NubusBus bus;
 };
 
 #endif