From mboxrd@z Thu Jan  1 00:00:00 1970
From: Satyam Sharma <satyam-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: BUG: scheduling while atomic: ifconfig/0x00000002/4170
Date: Thu, 6 Sep 2007 14:11:46 +0530 (IST)
Message-ID: <alpine.LFD.0.999.0709061409120.3781@enigma.security.iitk.ac.in>
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Cc: Florian Lohoff <flo-BCn6idZOOBwdnm+yROfE0A@public.gmane.org>,
	Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
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	Michal Piotrowski <michal.k.k.piotrowski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	ipw3945-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, yi.zhu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
To: Herbert Xu <herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
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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 ...