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qdev: Fix QOM unrealize behavior 

Since commit 249d41720b (qdev: Prepare
"realized" property) setting realized = true would register the device's
VMStateDescription, but realized = false would not unregister it. Fix that.

Moving the code from unparenting also revealed that we were calling
DeviceClass::init through DeviceClass::realize as interim solution but
DeviceClass::exit still at unparenting time with a realized check.
Make this symmetrical by implementing DeviceClass::unrealize to call it,
while we're setting realized = false in the unparenting path.
The only other unrealize user is mac_nvram, which can safely override it.

Thus, mark DeviceClass::exit as obsolete, new devices should implement
DeviceClass::unrealize instead.

Cc: qemu-stable@nongnu.org
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Message-id: 1366043650-9719-1-git-send-email-afaerber@suse.de
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Andreas Färber 2013-04-15 18:34:10 +02:00 committed by Anthony Liguori
parent e0e367bad7
commit fe6c211781
2 changed files with 19 additions and 8 deletions
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25
hw/core/qdev.c
View File

@ -182,6 +182,19 @@ static void device_realize(DeviceState *dev, Error **err)
}
}
static void device_unrealize(DeviceState *dev, Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
if (dc->exit) {
int rc = dc->exit(dev);
if (rc < 0) {
error_setg(errp, "Device exit failed.");
return;
}
}
}
void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id,
int required_for_version)
{
@ -694,6 +707,9 @@ static void device_set_realized(Object *obj, bool value, Error **err)
device_reset(dev);
}
} else if (!value && dev->realized) {
if (qdev_get_vmsd(dev)) {
vmstate_unregister(dev, qdev_get_vmsd(dev), dev);
}
if (dc->unrealize) {
dc->unrealize(dev, &local_err);
}
@ -764,7 +780,6 @@ 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;
QObject *event_data;
bool have_realized = dev->realized;
@ -774,12 +789,7 @@ static void device_unparent(Object *obj)
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);
}
object_property_set_bool(obj, false, "realized", NULL);
}
if (dev->parent_bus) {
bus_remove_child(dev->parent_bus, dev);
@ -809,6 +819,7 @@ static void device_class_init(ObjectClass *class, void *data)
class->unparent = device_unparent;
dc->realize = device_realize;
dc->unrealize = device_unrealize;
}
void device_reset(DeviceState *dev)

2
include/hw/qdev-core.h
View File

@ -96,7 +96,7 @@ typedef struct DeviceClass {
/* Private to qdev / bus. */
qdev_initfn init; /* TODO remove, once users are converted to realize */
qdev_event unplug;
qdev_event exit;
qdev_event exit; /* TODO remove, once users are converted to unrealize */
const char *bus_type;
} DeviceClass;