linux-kernel - Re: [PATCH 2/2] cfg80211: Use 5MHz bandwidth by default when checking usable channels

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Message-ID: <1403514536.4418.6.camel@jlt4.sipsolutions.net>
Date:	Mon, 23 Jun 2014 11:08:56 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	Rostislav Lisovy <lisovy@...il.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Sojka <sojkam1@....cvut.cz>, s.sander@...dsys.de,
	jan-niklas.meier@...kswagen.de,
	Rostislav Lisovy <rostislav.lisovy@....cvut.cz>
Subject: Re: [PATCH 2/2] cfg80211: Use 5MHz bandwidth by default when
 checking usable channels

On Sun, 2014-06-22 at 13:41 +0200, Felix Fietkau wrote:
> On 2014-04-15 14:37, Rostislav Lisovy wrote:
> > Current code checks if the 20MHz bandwidth is allowed for
> > particular channel -- if it is not, the channel is disabled.
> > Since we need to use 5/10 MHz channels, this code is modified in
> > the way that the default bandwidth to check is 5MHz. If the
> > maximum bandwidth allowed by the channel is smaller than 5MHz,
> > the channel is disabled. Otherwise the channel is used and the
> > flags are set according to the bandwidth allowed by the channel.
> > 
> > Signed-off-by: Rostislav Lisovy <rostislav.lisovy@....cvut.cz>

> This change causes a regression and needs to be reverted or fixed.

Noted, I've reverted it in mac80211.git.

> It leaves Channel 12 enabled for US regdomain and does not prevent
> bringing up AP mode on it (IEEE80211_CHAN_NO_20MHZ does not get set).

I'm not sure this makes sense - CHAN_NO_20MHZ shouldn't get set on that
channel? It should be disabled for other reasons for AP mode - e.g.
NO_IR.

johannes

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