Adrian Chadd e7200579b8 Add the new channel width change field to the ath(4) driver.
This is not entirely correct as it simply resets the channel, flushing
whatever is in the TX/RX queue.  This can and will break aggregation
BAW tracking.  But the alternative (HT40 frames being sent with the hardware
in HT20 mode) is even worse.

There's still a small window between the htinfo being received (and the ni_chw
field being updated) which could cause problems.  I'll look at fleshing this
out in follow-up commits.

PR:		kern/166286
2012-03-25 03:14:31 +00:00
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