diff mbox

[v2,02/12] virtio-net: fix virtio-net child refcount in transports

Message ID 1412057438-10004-3-git-send-email-arei.gonglei@huawei.com
State New
Headers show

Commit Message

Gonglei (Arei) Sept. 30, 2014, 6:10 a.m. UTC 
From: Gonglei <arei.gonglei@huawei.com>

object_initialize() leaves the object with a refcount of 1.
object_property_add_child() adds its own reference which is dropped
again when the property is deleted.

The upshot of this is that we always have a refcount >= 1.  Upon hot
unplug the virtio-net child is not finalized!

Drop our reference after the child property has been added to the
parent.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
---
 hw/s390x/s390-virtio-bus.c | 1 +
 hw/s390x/virtio-ccw.c      | 1 +
 hw/virtio/virtio-pci.c     | 1 +
 3 files changed, 3 insertions(+)

Comments

Cornelia Huck Sept. 30, 2014, 8:19 a.m. UTC | #1 
On Tue, 30 Sep 2014 14:10:28 +0800
<arei.gonglei@huawei.com> wrote:

> From: Gonglei <arei.gonglei@huawei.com>
> 
> object_initialize() leaves the object with a refcount of 1.
> object_property_add_child() adds its own reference which is dropped
> again when the property is deleted.
> 
> The upshot of this is that we always have a refcount >= 1.  Upon hot
> unplug the virtio-net child is not finalized!
> 
> Drop our reference after the child property has been added to the
> parent.
> 
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>
> ---
>  hw/s390x/s390-virtio-bus.c | 1 +
>  hw/s390x/virtio-ccw.c      | 1 +
>  hw/virtio/virtio-pci.c     | 1 +
>  3 files changed, 3 insertions(+)

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
diff mbox

Patch

diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index 5b5d595..297eac2 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -161,6 +161,7 @@  static void s390_virtio_net_instance_init(Object *obj)
     VirtIONetS390 *dev = VIRTIO_NET_S390(obj);
     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+    object_unref(OBJECT(&dev->vdev));
     qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
 }
 
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 7d67577..bb699f2 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -794,6 +794,7 @@  static void virtio_ccw_net_instance_init(Object *obj)
     VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+    object_unref(OBJECT(&dev->vdev));
     qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
 }
 
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 155fac9..b82b738 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1465,6 +1465,7 @@  static void virtio_net_pci_instance_init(Object *obj)
     VirtIONetPCI *dev = VIRTIO_NET_PCI(obj);
     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+    object_unref(OBJECT(&dev->vdev));
     qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
 }