bonding: use netdev_upper list in bond_vlan_used
bonding: use netdev_upper list in bond_vlan_used

Convert bond_vlan_used() to traverse the upper device list to see if we
have any vlans above us. It's protected by rcu, and in case we are holding
rtnl_lock we should call vlan_uses_dev() instead - it's faster.

CC: Jay Vosburgh <9ab50f27d4201db9b28483ba83c48ebafbb2aa17@us.ibm.com>
CC: Andy Gospodarek <e3579b1e47f273529f0f929453e939a68ede9fd1@greyhouse.net>
Signed-off-by: Veaceslav Falico <13e4c2c2c15eff98ad47d02f3ccee2d83dc7015d@redhat.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs