netdev - Lose AP-STA connection on changing channel width

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Message-ID: <CAG=xfvNyr26mBsGxjaVYU9VmSY+CqCE0vK0FW8Q4HAq_eUD6ag@mail.gmail.com>
Date:	Sat, 15 Jun 2013 19:01:54 -0700
From:	Zhe Wen <zhewen08@...il.com>
To:	netdev@...r.kernel.org
Subject: Lose AP-STA connection on changing channel width

Hello Developers!

I am trying to change channel type/width (HT20/HT40+) on the both STA
and AP side in a simple system consists of only 1 STA and the AP.

AP is started using hostapd under HT20 and STA thereafter connects to
it using also HT20. But when AP changes its channel type to HT40+
using ieee80211_set_channel_type() and ath9k_hw_set_channel_regs(), it
will lose connection to STA. The way I do channel type change
coordination is: STA sends an action frame to AP, AP sends back ACK
frame and changes its channel type; STA changes its channel type on
receiving the ACK.

I read about this solution
(http://eznemegy.blog.hu/2008/12/14/using_rt2x00_wireless_driver_with_hostapd/fullcommentlist/1)
of hacking into hostapd, which didn't work...

It would be great if you more experienced would love to help me with
this problem!

Thanks in advance!!
Zhe
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