1 Reset both IFF_OACTIVE and the transmit watchdog timer in
appropriate places to avoid both wedging the transmit section
and spurious transmit timeouts.
2 Reset IFF_ALLMULTI at the top of atw_filter_setup so that the
NIC will filter the multicast packets we are not interested in
after we come out of promiscuous mode.
3 In atw_txdrain, count drained transmit descriptors to avoid
descriptor exhaustion.
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