linux-kernel - Re: [PATCH v3 3/3] mac80211: mesh: fixed HT ies in beacon template

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Date:	Mon, 01 Aug 2016 12:03:42 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Masashi Honma <masashi.honma@...il.com>,
	Yaniv Machani <yanivma@...com>, linux-kernel@...r.kernel.org
Cc:	Meirav Kama <meiravk@...com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 3/3] mac80211: mesh: fixed HT ies in beacon template

On Fri, 2016-07-22 at 14:26 +0900, Masashi Honma wrote:
> On 2016年07月14日 05:07, Yaniv Machani wrote:
> > +
> > +	/* if channel width is 20MHz - configure HT capab
> > accordingly*/
> > +	if (sdata->vif.bss_conf.chandef.width ==
> > NL80211_CHAN_WIDTH_20) {
> > +		cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
> > +		cap &= ~IEEE80211_HT_CAP_DSSSCCK40;
> > +	}
> 
> I have tested this part of your patch and this works for me.
> 
> Previouly, "Supported Channel Width Set bit" in HT Capabilities
> element was 1 even though disable_ht40=1 existed in
> wpa_supplicant.conf. After appllication of patch, the bit was 0.
> 

But why is that behaviour *correct*? We still support 40 MHz bandwidth
things, we just don't use them if we disable HT40.

johannes