Subject: Re: mac80211 : WARN at net/mac80211/rate.h:153
From: Mattias Nissler <mattias.nissler@gmx.de>
To: Michael Buesch <mb@bu3sch.de>
Cc: Dave Young <hidave.darkstar@gmail.com>,
	linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	Stefano Brivio <stefano.brivio@polimi.it>
In-Reply-To: <200807141614.51628.mb@bu3sch.de>
References: <20080714075010.GA3559@darkstar>
	 <200807141614.51628.mb@bu3sch.de>
Content-Type: text/plain
Date: Mon, 14 Jul 2008 19:17:29 +0200
Message-Id: <1216055849.4435.7.camel@localhost> (sfid-20080714_191800_306683_95BC1A14)
Mime-Version: 1.0
Sender: linux-wireless-owner@vger.kernel.org

On Mon, 2008-07-14 at 16:14 +0200, Michael Buesch wrote:
> CCing PID guys.
> I've seen several people hitting this. What's the meaning of this warning?

It basically means the rate control cannot find any rate in
local->hw.wiphy->bands[local->hw.conf.channel->band] that is supported
by the sta in question. Normally this should not happen. I guess the
reason is that the supported rates bits in the sta info are all zero,
which would probably be a bug. I haven't seen this here, but I don't use
the IBSS code either. To further investigate this, you could the
following just before the WARN_ON:

printk(KERN_DEBUG "supported rates bitmask: %08x\n",
	sta->supp_rates[sband->band]);

Mattias