kern/173342: PS-Poll isn't working

>Number:         173342
>Category:       kern
>Synopsis:       PS-Poll isn't working
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov 04 00:10:01 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Rui Paulo
>Release:        FreeBSD 9.1-PRERELEASE amd64
>Organization:
>Environment:
System: FreeBSD freefall.freebsd.org 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #0 r241358: Mon Oct 8 23:17:12 UTC 2012 peter@freefall.freebsd.org:/usr/src/sys/amd64/compile/FREEFALL amd64
>Description:

PS-Poll seems to be broken. My wife's MacBook Air generates a lot of
PS-Poll frames:
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, send packet, 14 still queued
wlan1: [xx:xx:xx:d7:24:20] save frame with age 0, 15 now queued
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, send packet, 14 still queued
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, send packet, 13 still queued
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, send packet, 12 still queued
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, send packet, 11 still queued
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, send packet, 10 still queued

And later lots of these:
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, but queue empty
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, but queue empty
wlan1: [xx:xx:xx:d7:24:20] recv ps-poll, but queue empty

At this point the Atheros card isn't working and all stations
disassociate.

>How-To-Repeat:
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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