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qdev: fix device_del by refactoring reference counting 

Commit 8eb0283 broken device_del by having too overzealous reference counting
checks.  Move the reference count checks to qdev_free(), make sure to remove
the parent link on free, and decrement the reference count on property removal.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
master
Anthony Liguori 2012-01-13 07:45:55 -06:00
parent 607a2c72e5
commit 024a6fbdb9
1 changed files with 39 additions and 6 deletions
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45
hw/qdev.c
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@ -376,11 +376,6 @@ int qdev_unplug(DeviceState *dev)
}
assert(dev->info->unplug != NULL);
if (dev->ref != 0) {
qerror_report(QERR_DEVICE_IN_USE, dev->id?:"");
return -1;
}
qdev_hot_removed = true;
return dev->info->unplug(dev);
@ -465,6 +460,29 @@ static void qdev_property_del_all(DeviceState *dev)
}
}
static void qdev_property_del_child(DeviceState *dev, DeviceState *child, Error **errp)
{
DeviceProperty *prop;
QTAILQ_FOREACH(prop, &dev->properties, node) {
if (strstart(prop->type, "child<", NULL) && prop->opaque == child) {
break;
}
}
g_assert(prop != NULL);
QTAILQ_REMOVE(&dev->properties, prop, node);
if (prop->release) {
prop->release(dev, prop->name, prop->opaque);
}
g_free(prop->name);
g_free(prop->type);
g_free(prop);
}
/* Unlink device from bus and free the structure. */
void qdev_free(DeviceState *dev)
{
@ -491,6 +509,12 @@ void qdev_free(DeviceState *dev)
prop->info->free(dev, prop);
}
}
if (dev->parent) {
qdev_property_del_child(dev->parent, dev, NULL);
}
if (dev->ref != 0) {
qerror_report(QERR_DEVICE_IN_USE, dev->id?:"");
}
g_free(dev);
}
@ -1239,6 +1263,14 @@ static void qdev_get_child_property(DeviceState *dev, Visitor *v, void *opaque,
g_free(path);
}
static void qdev_release_child_property(DeviceState *dev, const char *name,
void *opaque)
{
DeviceState *child = opaque;
qdev_unref(child);
}
void qdev_property_add_child(DeviceState *dev, const char *name,
DeviceState *child, Error **errp)
{
@ -1247,7 +1279,8 @@ void qdev_property_add_child(DeviceState *dev, const char *name,
type = g_strdup_printf("child<%s>", child->info->name);
qdev_property_add(dev, name, type, qdev_get_child_property,
NULL, NULL, child, errp);
NULL, qdev_release_child_property,
child, errp);
qdev_ref(child);
g_assert(child->parent == NULL);