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[Qemu-devel] [PATCH v2 07/12] qdev: move unrealization of devices from f
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v2 07/12] qdev: move unrealization of devices from finalize to unparent |
Date: |
Mon, 21 Jan 2013 13:30:17 +0100 |
Similarly, a bus holds a reference back to the device, and this will
prevent the device from going away as soon as this reference is counted
properly. To avoid this, move the unrealization of devices to the
unparent callback. This includes recursively unparenting all the buses
and (after the previous patch) the devices on those buses, which ensures
that the web of references completely disappears for all devices that
reside (in the qdev tree) below the one being unplugged.
After this patch, the qdev tree and the bus<->child relationship is
defined as "A is above B, iff unplugging A will automatically unplug B".
Signed-off-by: Paolo Bonzini <address@hidden>
---
hw/qdev.c | 35 +++++++++++++++++------------------
1 file changed, 17 insertions(+), 18 deletions(-)
diff --git a/hw/qdev.c b/hw/qdev.c
index 83420ac..aad360f 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -738,23 +738,8 @@ static void device_initfn(Object *obj)
static void device_finalize(Object *obj)
{
DeviceState *dev = DEVICE(obj);
- BusState *bus;
- DeviceClass *dc = DEVICE_GET_CLASS(dev);
-
- if (dev->realized) {
- while (dev->num_child_bus) {
- bus = QLIST_FIRST(&dev->child_bus);
- qbus_free(bus);
- }
- if (qdev_get_vmsd(dev)) {
- vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
- }
- if (dc->exit) {
- dc->exit(dev);
- }
- if (dev->opts) {
- qemu_opts_del(dev->opts);
- }
+ if (dev->opts) {
+ qemu_opts_del(dev->opts);
}
}
@@ -771,8 +756,22 @@ static void device_class_base_init(ObjectClass *class,
void *data)
static void device_unparent(Object *obj)
{
DeviceState *dev = DEVICE(obj);
+ DeviceClass *dc = DEVICE_GET_CLASS(dev);
+ BusState *bus;
- if (dev->parent_bus != NULL) {
+ while (dev->num_child_bus) {
+ bus = QLIST_FIRST(&dev->child_bus);
+ qbus_free(bus);
+ }
+ if (dev->realized) {
+ if (qdev_get_vmsd(dev)) {
+ vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
+ }
+ if (dc->exit) {
+ dc->exit(dev);
+ }
+ }
+ if (dev->parent_bus) {
bus_remove_child(dev->parent_bus, dev);
}
}
--
1.8.1
- [Qemu-devel] [PATCH v2 00/12] qdev: correct reference counting, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 01/12] qdev: export and use qbus_init, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 02/12] qdev: use object_new, not g_malloc to create buses, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 03/12] qom: preserve object while unparenting it, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 05/12] qdev: add reference count to a device for the BusChild, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 06/12] qdev: move deletion of children from finalize to unparent, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 07/12] qdev: move unrealization of devices from finalize to unparent,
Paolo Bonzini <=
- [Qemu-devel] [PATCH v2 11/12] cpu: do not use object_delete, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 09/12] qdev: inline object_delete into qbus_free/qdev_free, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 04/12] qom: document reference counting of link properties, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 08/12] qdev: add reference for the bus while it is referred to by the DeviceState, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 10/12] qdev: drop extra references at creation time, Paolo Bonzini, 2013/01/21
- [Qemu-devel] [PATCH v2 12/12] qom: remove object_delete, Paolo Bonzini, 2013/01/21
- Re: [Qemu-devel] [PATCH v2 00/12] qdev: correct reference counting, Anthony Liguori, 2013/01/21
- Re: [Qemu-devel] [PATCH v2 00/12] qdev: correct reference counting, Paolo Bonzini, 2013/01/25