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Re: [RFC PATCHv2] mac80211: Add support for hardware ARP query filtering

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On Wed, 2010-05-26 at 15:51 +0300, Juuso Oikarinen wrote:

> > > +	rtnl_lock();
> > > +	ieee80211_set_arp_filter(sdata);
> > > +	rtnl_unlock();
> > > +
> > 
> > Please analyse locking in more detail and enable lockdep :)
> > 
> > This will cause deadlocks.
> 
> I have lockdep permanently enabled in my development kernel. It has
> given me no complaints in testing with the corresponding wl1271 driver
> patch.
> 
> But I will look into those locks further if I can figure out any
> deadlock scenarios.

Interesting .. because for sure a lot of the ieee80211_mgd_* functions
are called with rtnl held and lock the mgd mutex, but it is the other
way around here.

johannes

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