diff options
author | Stefan Hajnoczi <stefanha@redhat.com> | 2014-03-19 08:58:55 +0100 |
---|---|---|
committer | Andreas Färber <afaerber@suse.de> | 2014-03-19 22:05:20 +0100 |
commit | 9561fda8d90e176bef598ba87c42a1bd6ad03ef7 (patch) | |
tree | ca7896ed13382ba841ec2af894b1cee65c1a3dae /hw/core | |
parent | c6aed9833419eed9de19919ff31aa021a6171521 (diff) |
qom: Make QOM link property unref optional
Some object_property_add_link() callers expect property deletion to
unref the link property object. Other callers expect to manage the
refcount themselves. The former are currently broken and therefore leak
the link property object.
This patch adds a flags argument to object_property_add_link() so the
caller can specify which refcount behavior they require. The new
OBJ_PROP_LINK_UNREF_ON_RELEASE flag causes the link pointer to be
unreferenced when the property is deleted.
This fixes refcount leaks in qdev.c, xilinx_axidma.c, xilinx_axienet.c,
s390-virtio-bus.c, virtio-pci.c, virtio-rng.c, and ui/console.c.
Rationale for refcount behavior:
* hw/core/qdev.c
- bus children are explicitly unreferenced, don't interfere
- parent_bus is essentially a read-only property that doesn't hold a
refcount, don't unref
- hotplug_handler is leaked, do unref
* hw/dma/xilinx_axidma.c
- rx stream "dma" links are set using set_link, therefore they
need unref
- tx streams are set using set_link, therefore they need unref
* hw/net/xilinx_axienet.c
- same reasoning as hw/dma/xilinx_axidma.c
* hw/pcmcia/pxa2xx.c
- pxa2xx bypasses set_link and therefore does not use refcounts
* hw/s390x/s390-virtio-bus.c
* hw/virtio/virtio-pci.c
* hw/virtio/virtio-rng.c
* ui/console.c
- set_link is used and there is no explicit unref, do unref
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>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Diffstat (limited to 'hw/core')
-rw-r--r-- | hw/core/qdev.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 9f0a522ee8..a182917222 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -97,8 +97,7 @@ 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, - NULL); + (Object **)&kid->child, 0, NULL); } void qdev_set_parent_bus(DeviceState *dev, BusState *bus) @@ -824,7 +823,8 @@ 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, &error_abort); + (Object **)&dev->parent_bus, 0, + &error_abort); } static void device_post_init(Object *obj) @@ -944,7 +944,9 @@ static void qbus_initfn(Object *obj) QTAILQ_INIT(&bus->children); object_property_add_link(obj, QDEV_HOTPLUG_HANDLER_PROPERTY, TYPE_HOTPLUG_HANDLER, - (Object **)&bus->hotplug_handler, NULL); + (Object **)&bus->hotplug_handler, + OBJ_PROP_LINK_UNREF_ON_RELEASE, + NULL); object_property_add_bool(obj, "realized", bus_get_realized, bus_set_realized, NULL); } |