[patch] teach ath(4) to not flush frames during reset or run reset/tx/rx concurrently

[Adrian Chadd]

Hi,

One of my major outstanding issues with the atheros 11n tx/rx support
is to not flush frames out of the tx and rx queue during a queue reset
(eg during fatal errors, stuck beacon, etc.)
I can't (yet) do much when operational changes occur. I'll work on
that in subsequent commits.

I'd appreciate testing and feedback before I merge this into -HEAD.

Thanks,


Adrian
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