[v3,07/12] qdev: move unrealization of devices from finalize to unparent

Submitted by Paolo Bonzini on Jan. 25, 2013, 11:46 a.m.

Details

Message ID 1359114420-16149-8-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini Jan. 25, 2013, 11:46 a.m.
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 <pbonzini@redhat.com>
---
 hw/qdev.c | 35 +++++++++++++++++------------------
 1 file changed, 17 insertions(+), 18 deletions(-)

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diff --git a/hw/qdev.c b/hw/qdev.c
index 364386d..b3c1e65 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);
     }
 }