Re: WARNING: at net/mac80211/iface.c:162

[Johannes Berg <johannes@sipsolutions.net>]

On Mon, 2012-05-07 at 10:12 -0500, Larry Finger wrote:
> On 05/07/2012 06:29 AM, Johannes Berg wrote:
> > On Mon, 2012-05-07 at 09:55 +0200, Arend van Spriel wrote:
> >> On 05/07/2012 08:34 AM, Johannes Berg wrote:
> >>> On Sun, 2012-05-06 at 18:30 -0500, Larry Finger wrote:
> >>>> Hi,
> >>>>
> >>>> I am getting the following warning from the latest wireless-testing system:
> >>>>
> >>>>    ------------[ cut here ]------------
> >>>>    WARNING: at net/mac80211/iface.c:162 ieee80211_check_queues+0x119/0x130
> >>>> [mac80211]()
> >>>
> >>>
> >>>>        if (WARN_ON_ONCE(sdata->vif.hw_queue[i]>= n_queues))
> >>>>
> >>>> The warning is triggered for i, n_queues, and sdata->vif.hw_queue[i] all equal to 1.
> >>>
> >>> Is this a driver with just a single queue by any chance? I never tested
> >>> that and probably forgot to set those up correctly.
> >>>
> >>
> >> The bug report Larry mentions is with iwlwifi driver:
> >>
> >> pci, iwlwifi, NETWORK, Centrino Wireless-N 130 BGN
> >
> > No, the bug report says rtl8187, the user said this happened when
> > plugging in the USB device.
> >
> > I think this will fix it:
> >
> > --- a/net/mac80211/iface.c
> > +++ b/net/mac80211/iface.c
> > @@ -206,8 +206,10 @@ static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
> >   	for (i = 0; i<  IEEE80211_NUM_ACS; i++) {
> >   		if (local->hw.flags&  IEEE80211_HW_QUEUE_CONTROL)
> >   			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
> > -		else
> > +		else if (local->hw.queues>= IEEE80211_NUM_ACS)
> >   			sdata->vif.hw_queue[i] = i;
> > +		else
> > +			sdata->vif.hw_queue[i] = 0;
> >   	}
> >   	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
> >   }
> 
> Yes, this patch fixes the problem.
> 
> Reported-and-Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
> 
> Once you post the patch, I will update that entry at bugzilla.redhat.com.

Great, thanks.

johannes