[PATCHv5,3/5] fw_cfg: move assert() and linking of fw_cfg device to the machine into instance_init()

Commit Message

Mark Cave-Ayland June 18, 2017, 8:02 a.m. UTC

In preparation for calling fw_cfg_init1() during realize rather than during
init, move the assert() checking for existing fw_cfg devices and the linking
of the device to the machine with object_property_add_child() to a new
fw_cfg instance_init() function.

This guarantees that we will still assert() correctly if more than one fw_cfg
device is instantiated by accident.

Signed-off-by: Mark Cave-Ayland <[e-mail]>
Reviewed-by: Laszlo Ersek <[e-mail]>
---
 hw/nvram/fw_cfg.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

Patch

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 99bdbc2..af45012 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -915,10 +915,6 @@  static void fw_cfg_init1(DeviceState *dev)
     MachineState *machine = MACHINE(qdev_get_machine());
     uint32_t version = FW_CFG_VERSION;
 
-    assert(!object_resolve_path(FW_CFG_PATH, NULL));
-
-    object_property_add_child(OBJECT(machine), FW_CFG_NAME, OBJECT(s), NULL);
-
     qdev_init_nofail(dev);
 
     fw_cfg_add_bytes(s, FW_CFG_SIGNATURE, (char *)"QEMU", 4);
@@ -1020,6 +1016,15 @@  FWCfgState *fw_cfg_find(void)
     return FW_CFG(object_resolve_path(FW_CFG_PATH, NULL));
 }
 
+static void fw_cfg_init(Object *obj)
+{
+    MachineState *machine = MACHINE(qdev_get_machine());
+
+    assert(!object_resolve_path(FW_CFG_PATH, NULL));
+
+    object_property_add_child(OBJECT(machine), FW_CFG_NAME, obj, NULL);
+}
+
 static void fw_cfg_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1033,6 +1038,7 @@  static const TypeInfo fw_cfg_info = {
     .parent        = TYPE_SYS_BUS_DEVICE,
     .abstract      = true,
     .instance_size = sizeof(FWCfgState),
+    .instance_init = fw_cfg_init,
     .class_init    = fw_cfg_class_init,
 };