Merge branch 'rxbusy'

Mahesh Bandewar says:

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use netdev_is_rx_handler_busy() in few known cases

netdev_rx_handler_register() was recently split into two parts - (a) check
if the handler is used, (b) register the new handler, parts. This is
helpful in scenarios like bonding where at the time of registration there
is too much state to unwind and it should check if the device is free
before building that state. IPvlan and macvlan drivers don't have this
issue however it can make use of the same check instead of using a device
specific check.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>