On Sun, Aug 26, 2012 at 11:51 PM, Anthony Liguori <aligu...@us.ibm.com> wrote:
> Also make setting the link to NULL break the bus link
>
> Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
> ---
> hw/qdev.c | 48 ++++++++++++++++++++++++++++++++++++++++++------
> 1 files changed, 42 insertions(+), 6 deletions(-)
>
> diff --git a/hw/qdev.c b/hw/qdev.c
> index 86e1337..525a0cb 100644
> --- a/hw/qdev.c
> +++ b/hw/qdev.c
> @@ -100,8 +100,7 @@ static void bus_add_child(BusState *bus, DeviceState
> *child)
>
> void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
> {
> - dev->parent_bus = bus;
> - bus_add_child(bus, dev);
> + object_property_set_link(OBJECT(dev), OBJECT(bus), "parent_bus", NULL);
> }
>
> /* Create a new device. This only initializes the device state structure
> @@ -241,8 +240,8 @@ void qbus_reset_all_fn(void *opaque)
> /* can be used as ->unplug() callback for the simple cases */
> int qdev_simple_unplug_cb(DeviceState *dev)
> {
> - /* just zap it */
> - qdev_free(dev);
> + /* Unplug from parent bus via a forced eject */
> + qdev_set_parent_bus(dev, NULL);
I think it is more reliable to remove the reference property(child,
link) before object_finialize(). So when uplug-finish, we delete all
the refers: bus->child, bus<-child by _del_property not using
_set_property.
> return 0;
> }
>
> @@ -646,6 +645,40 @@ void qdev_property_add_static(DeviceState *dev, Property
> *prop,
> assert_no_error(local_err);
> }
>
> +static void qdev_set_link_property(Object *obj, Visitor *v, void *opaque,
> + const char *name, Error **errp)
> +{
> + DeviceState *dev = DEVICE(obj);
> + BusState *parent_bus = dev->parent_bus;
> +
> + object_set_link_property(obj, v, opaque, name, errp);
> +
> + if (parent_bus) {
> + bus_remove_child(parent_bus, dev);
> + }
> +
> + if (dev->parent_bus) {
> + bus_add_child(dev->parent_bus, dev);
> + }
> +
> + if (!dev->parent_bus) {
> + notifier_list_notify(&dev->eject_notifier, dev);
> + }
> +}
> +
> +static void qdev_release_link_property(Object *obj, const char *name,
> + void *opaque)
> +{
> + DeviceState *dev = DEVICE(obj);
> +
> + if (dev->parent_bus) {
> + bus_remove_child(dev->parent_bus, dev);
> + object_unref(OBJECT(dev->parent_bus));
> + }
> +
> + dev->parent_bus = NULL;
> +}
> +
> static void device_initfn(Object *obj)
> {
> DeviceState *dev = DEVICE(obj);
> @@ -670,8 +703,11 @@ static void device_initfn(Object *obj)
> } while (class != object_class_by_name(TYPE_DEVICE));
> qdev_prop_set_globals(dev);
>
> - object_property_add_link(OBJECT(dev), "parent_bus", TYPE_BUS,
> - (Object **)&dev->parent_bus, NULL);
> + object_property_add(OBJECT(dev), "parent_bus", "link<" TYPE_BUS ">",
> + object_get_link_property,
> + qdev_set_link_property,
> + qdev_release_link_property,
> + &dev->parent_bus, NULL);
>
> notifier_list_init(&dev->eject_notifier);
> }
> --
> 1.7.5.4
>
>
