On Wed, 2009-05-06 at 16:12 -0400, Pavel Roskin wrote:
> > > > If I scan by "iw dev wlan0 scan" while sending data through the
> > > > interface, I get a BUG in net/mac80211/tx.c:
> > >
> > > Agreed... Also I think the same thing happens for rx for ath5k,
> > > explaining the 'unknown rate index' warnings (sc->curband changes
> > > during scan but we process a beacon from 2ghz band, that one at
> > > least just needs some synchronization in the driver).
> >
> > Ah, that could be -- I sure am tired of reading bug reports about
> > that...
>
> I've bisected it. The problem is introduced by the commit
> 2038ccfbb5f7fc7d8bca26bf53bdd6c7778136ff:
>
> Author: Johannes Berg <johan...@sipsolutions.net>
> AuthorDate: Wed Apr 29 12:26:17 2009 +0200
> Commit: John W. Linville <linvi...@tuxdriver.com>
> CommitDate: Thu Apr 30 15:06:34 2009 -0400
>
> mac80211: tell driver when idle
Huh? That's confusing. Also, you say you get a BUG but point out a
WARN_ON_ONCE, was that an oversight or does something crash there?
OTOH, I can see one thing happening -- it would access scan_channel.
Patch should fix that, does it help?
johannes
--- wireless-testing.orig/net/mac80211/iface.c 2009-05-06 22:25:45.000000000
+0200
+++ wireless-testing/net/mac80211/iface.c 2009-05-06 22:25:53.000000000
+0200
@@ -964,5 +964,6 @@ void ieee80211_recalc_idle(struct ieee80
mutex_lock(&local->iflist_mtx);
chg = __ieee80211_recalc_idle(local);
mutex_unlock(&local->iflist_mtx);
- ieee80211_hw_config(local, chg);
+ if (chg)
+ ieee80211_hw_config(local, chg);
}
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