[PATCH] virtio-net: fix removal of failover device

[Juan Quintela]

If you have a networking device and its virtio failover device, and
you remove them in this order:
- virtio device
- the real device

You get qemu crash.
See bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1820120

Bug exist on qemu 4.2 and 5.0.
But in 5.0 don't shows because commit
77b06bba62034a87cc61a9c8de1309ae3e527d97

somehow papers over it.

CC: Jason Wang <jasowang@redhat.com>
CC: Michael S. Tsirkin <mst@redhat.com>

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 hw/net/virtio-net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 9bb5578e5d..8d84713df3 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3398,6 +3398,7 @@ static void virtio_net_device_unrealize(DeviceState *dev)
     g_free(n->vlans);
 
     if (n->failover) {
+        device_listener_unregister(&n->primary_listener);
         g_free(n->primary_device_id);
         g_free(n->standby_id);
         qobject_unref(n->primary_device_dict);
-- 
2.25.4