The VLAN 8021q driver needs to call rcu_barrier() when unloading the module,
instead of syncronize_net().  This is needed to make sure that outstanding
call_rcu() callbacks have completed, before the callback function code is
removed on module unload.
Signed-off-by: NJesper Dangaard Brouer <hawk@comx.dk>
Reviewed-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>