Return-path: Received: from he.sipsolutions.net ([78.46.109.217]:50913 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758313Ab2CSIYd (ORCPT ); Mon, 19 Mar 2012 04:24:33 -0400 Subject: Re: mac80211 20/40 coexist From: Johannes Berg To: Adrian Chadd Cc: "Manoharan, Rajkumar" , "Manoharan, Sujith" , linux-wireless In-Reply-To: (sfid-20120318_201943_672959_05F441F9) References: <1331818214.3432.12.camel@jlt3.sipsolutions.net> <8F3AF1C9F856774F8C8D67AA7EDFEC8801E3005E@aphydexd01b> <1331902885.6753.10.camel@jlt3.sipsolutions.net> <8F3AF1C9F856774F8C8D67AA7EDFEC8801E3040B@aphydexd01b> <1332065984.3609.5.camel@jlt3.sipsolutions.net> (sfid-20120318_201943_672959_05F441F9) Content-Type: text/plain; charset="UTF-8" Date: Mon, 19 Mar 2012 09:24:28 +0100 Message-ID: <1332145468.3359.3.camel@jlt3.sipsolutions.net> (sfid-20120319_092441_584875_91FFBDCE) Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Sun, 2012-03-18 at 12:19 -0700, Adrian Chadd wrote: > On 18 March 2012 03:19, Johannes Berg wrote: > > > I'm not sure I can believe this -- surely the firmware has to have a way > > of dealing with stations that can't do 40 MHz and stations that can, so > > switching between the two doesn't seem like a major proposal? We also > > don't currently handle the action frames for that, but it seems like we > > should. > > > > Note, however, that we're now discussing something already done -- > > Paul's patch already removed the channel type update when all we wanted > > was update the RC. > > When are stations being notified of a CWM change? > I know FreeBSD handles it with a big stick at the moment - it just > does a full interface reset and channel change. I don't necessarily > like it, but I haven't yet sat down to look at when and why this is > occuring. I'm not convinced this is the right thing to do -- we kinda do/did the same thing but we want to change TX bandwidth for the AP peer, not RX (channel) bandwidth. johannes