[PATCH 5/6] vdpa: reorder listener assignment

["Eugenio Pérez" <eperezma@redhat.com>]

Since commit f6fe3e333f ("vdpa: move memory listener to
vhost_vdpa_shared") this piece of code repeatedly assign
shared->listener members.  This was not a problem as it was not used
until device start.

However next patches move the listener registration to this
vhost_vdpa_init function.  When the listener is registered it is added
to an embedded linked list, so setting its members again will cause
memory corruption to the linked list node.

Do the right thing and only set it in the first vdpa device.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/vhost-vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index b08349d57c..521a889104 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -619,7 +619,6 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp)
 
     v->dev = dev;
     dev->opaque =  opaque ;
-    v->shared->listener = vhost_vdpa_memory_listener;
 
     ret = vhost_vdpa_set_backend_cap(dev);
     if (unlikely(ret != 0)) {
@@ -661,6 +660,7 @@ static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp)
     vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE |
                                VIRTIO_CONFIG_S_DRIVER);
 
+    v->shared->listener = vhost_vdpa_memory_listener;
     return 0;
 }
 
-- 
2.39.3