p54 problem with PS

[Johannes Berg <johannes@sipsolutions.net>]

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Right after associating, the AP sends us the EAPOL frame. We miss that
frame, due to a race condition (we add the STA info for the AP a little
too late and drop the frame because we don't know who it is from).

The AP of course retries the frame, a little later, but p54 misses the
TIM bit -- see the ps.pkt file.

We should probably make that race window smaller somehow (stop the
tasklet that is processing RX while processing assoc frames maybe?) but
this is clearly foremost a p54 problem.

johannes

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