From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexander Mukhin <alexander.i.mukhin@gmail.com>
Date: Sat, 30 Dec 2017 12:50:00 +0300
Subject: [Buildroot] [PATCH 3/4] hostapd: make ACS dependent on nl80211
In-Reply-To: <20171229223748.5dd69cd3@windsurf.lan>
References: <20171223190617.3981-1-alexander.i.mukhin@gmail.com>
 <20171223190617.3981-4-alexander.i.mukhin@gmail.com>
 <20171229223748.5dd69cd3@windsurf.lan>
Message-ID: <20171230095000.GA486@hpx>
List-Id: <buildroot.busybox.net>
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To: buildroot@busybox.net

Hello,

> > ACS is supported for nl80211 driver only.
> > 
> Could you add more details here? Do you see a build failure? Runtime
> failure?
> 
> If CONFIG_ACS=y doesn't build when CONFIG_DRIVER_NL80211 is disabled,
> then this fix should be part of PATCH 2/4, otherwise PATCH 2/4
> introduces a build regression.

My guide here is hostapd's defconfig, where it's stated that "ACS is
currently only supported through the nl80211 driver". Search through the
source code also reveals ACS machinery in the nl80211 driver only.

hostapd builds successively with ACS enabled and nl80211 disabled, but
an attempt to use ACS by setting a wireless channel to 0 results in a
runtime failure (driver doesn't accept this value).

-- 
Best regards,
Alexander.