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qom/object.c: Allow itf cast with num_itfs = 0 

num_interfaces only tells you how many interfaces the concrete child class has
(as defined in the TypeInfo). This means if you have a child class which defines
no interfaces of its own, but its parent has interfaces you cannot cast to those
parent interfaces.

Fixed changing the guard to check the class->interfaces list instead (which is
a complete flattened list of implemented interfaces).

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: a8c2db3b9b1f3c4bb81aca352b69e33260f36545.1361246206.git.peter.crosthwaite@xilinx.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Peter Crosthwaite 2013-02-19 14:02:10 +10:00 committed by Anthony Liguori
parent 3e407de477
commit 00e2ceae6c
1 changed files with 2 additions and 1 deletions
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3
qom/object.c
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@ -449,7 +449,8 @@ ObjectClass *object_class_dynamic_cast(ObjectClass *class,
TypeImpl *type = class->type;
ObjectClass *ret = NULL;
if (type->num_interfaces && type_is_ancestor(target_type, type_interface)) {
if (type->class->interfaces &&
type_is_ancestor(target_type, type_interface)) {
int found = 0;
GSList *i;