From: Paolo Abeni <pabeni@redhat.com>
Date: Wed, 25 Nov 2015 18:05:27 +0100

After 614732eaa12d, no refcount is mainteined for the vport-vxlan module.
This allows the userspace to remove such module while vport-vxlan
devices still exist, which lead to later oops, i.e. when
the openvswitch module is removed.

Fixes: 614732eaa12d ("openvswitch: Use regular VXLAN net_device device")

Signed-off-by: Paolo Abeni <pabeni@redhat.com>

This is so error prone, with some vport_ops needing to mark the
module and some don't (because they are in the main openvswitch
driver).

Fix this properly, by making the vport_ops register function be
a macro that sets THIS_MODULE in the vport_ops before passing it
on down to the real registry function.