On Thu, 6 Sep 2007, Herbert Xu wrote:

> On Thu, Sep 06, 2007 at 10:32:33AM +0530, Satyam Sharma wrote:
> > 
> > > > [  382.529041]  [<c02c8abc>] dev_close+0x24/0x67
> > > > [  382.529052]  [<e01f402b>] ieee80211_master_stop+0x4a/0x6d [mac80211]
> 
> This is where the bug is.  You cannot call dev_close from an
> atomic context as i33380211_master_stop does it within spin
> locks.

Doh, of course! I must be blind ... and wait_for_completion()'s
might_sleep() clearly didn't trigger earlier because Florian must've
had CONFIG_DEBUG_SPINLOCK_SLEEP off in his .config ...
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