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qom: Add check() argument to object_property_add_link()

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There are currently three types of object_property_add_link() callers:

1. The link property may be set at any time.
2. The link property of a DeviceState instance may only be set before
   realize.
3. The link property may never be set, it is read-only.

Something similar can already be achieved with
object_property_add_str()'s set() argument.  Follow its example and add
a check() argument to object_property_add_link().

Also provide default check() functions for case #1 and #2.  Case #3 is
covered by passing a NULL function pointer.

Cc: Peter Crosthwaite <peter.crosthwaite@petalogix.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Anthony Liguori <aliguori@amazon.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
[AF: Tweaked documentation comment]
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Stefan Hajnoczi 2014-03-19 08:58:56 +01:00 • committed by Andreas Färber
parent 9561fda8d9
commit 39f72ef94b
13 changed files with 80 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

8
hw/core/qdev.c
View file

@ -97,7 +97,10 @@ static void bus_add_child(BusState *bus, DeviceState *child)
snprintf(name, sizeof(name), "child[%d]", kid->index);
object_property_add_link(OBJECT(bus), name,
object_get_typename(OBJECT(child)),
(Object **)&kid->child, 0, NULL);
(Object **)&kid->child,
NULL, /* read-only property */
0, /* return ownership on prop deletion */
NULL);
}
void qdev_set_parent_bus(DeviceState *dev, BusState *bus)
@ -823,7 +826,7 @@ static void device_initfn(Object *obj)
} while (class != object_class_by_name(TYPE_DEVICE));
object_property_add_link(OBJECT(dev), "parent_bus", TYPE_BUS,
(Object **)&dev->parent_bus, 0,
(Object **)&dev->parent_bus, NULL, 0,
&error_abort);
}
@ -945,6 +948,7 @@ static void qbus_initfn(Object *obj)
object_property_add_link(obj, QDEV_HOTPLUG_HANDLER_PROPERTY,
TYPE_HOTPLUG_HANDLER,
(Object **)&bus->hotplug_handler,
object_property_allow_set_link,
OBJ_PROP_LINK_UNREF_ON_RELEASE,
NULL);
object_property_add_bool(obj, "realized",