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IPvlan checks if the master device is already used by checking a specific device (here it's macvlan device). This is technically not sufficient and it should just ensure the rx_handler is busy or not. This would be a super check that includes macvlan and any other that has already registered rx-handler. Signed-off-by: Mahesh Bandewar <maheshb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>