net: Introduce unregister_netdevice_many()
Introduce rollback_registered_many() and unregister_netdevice_many() rollback_registered_many() is able to perform necessary steps at device dismantle time, factorizing two expensive synchronize_net() calls. Signed-off-by:Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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