From: "Lars Ericsson" <Lars_Ericsson@telia.com>
To: "'Ivo van Doorn'" <ivdoorn@gmail.com>
Cc: <hostap@lists.shmoo.com>, <linux-wireless@vger.kernel.org>,
	<rt2400-devel@lists.sourceforge.net>
Subject: RE: [Rt2400-devel] mac80211 / rt2x00 / rt61 and adhoc status
Date: Sun, 17 Aug 2008 22:42:38 +0200
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> > > > > Two tests cases, but same behaviour:
> > > > > 1) Linx.git: 2.6.26 and wpa_supplicant 0.5.9
> > > > > 2) rt2x00.git: Version 2.2.0 and wpa_supplicant 0.5.9
> > > > 
> > > > Are any beacons going out? Is there anything in the logs which
> > > > indicates what is happening?
> > > > 
> > > 
> > > As you can se in the trace below, the configuration 
> > proceeds and the adhoc
> > > is created.
> > > The warnon might give some clues.
> > 
> > So how about those beacons? are they getting out?
> > 
> 
> After patching the wpa_suplicant (0.5.9) adhoc works.
> When first started, as the only part in the adhoc net, the 
> driver just scans
> around for other adhoc members.
> This happen in mac80211 state 4 and no beacons are sent, as 
> far as I can
> tell. Only probe requests are sent.
> 
> When an other node (N2) shows up in the same adhoc net work, N2 starts
> sending beacons immediately.
> The RT61 catch that and merge that ibss, switch to state 5 
> and all is fine.
> At this time ping works in both directions.
> 
> When removing the second note, leaving the RT61 alone, RT61 
> starts sending
> beacons, still in state 5.

The reason for the above behaviour are timeouts.
- Mac80211 will create an ibss after 20 seconds probing for existing ibss.
- Wpa_supplicant will restart this timer every 5 second ....

Changing the wpa timer will make the rt61 start sending beacons even if no
other STA is available.

I think that wpa_supplicant 0.5.10 addresses this issue, I will check and
come back.

/Lars