quoted

Good point :-) So I suggest we have one function that adds new packets
to the ACK queue (which is represented by a struct an instance of which
a driver can keep in its queue information) and another one that matches
a received ACK with the queue, reports the status to mac80211 and purges
the queue entries up to the match (reporting them as failed).

Mikko: I could hack this up, but since your initial patch is not far
from what's been discussed, I rather wait for a comment on whether you
want to do it.

Mattias

Feel free to hack up a patch. The functions 
rt2x00lib_get_match_from_ack_queue and rt2x00lib_push_to_ack_queue are
already generic handlers for the queue. 

Mattias, please note my comments on Mikko's patch if you are going to copy them. :)

Ivo