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Date:	Wed, 11 Nov 2009 22:18:50 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Oliver Neukum <oliver@...kum.org>,
	linux-bluetooth@...r.kernel.org
Subject: Re: GPF in run_workqueue()/list_del_init(cwq->worklist.next) on resume (was: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt_count leakage in keventd)

On Wednesday 11 November 2009, Linus Torvalds wrote:
> 
> On Wed, 11 Nov 2009, Marcel Holtmann wrote:
> > 
> > As it seems the btusb_close() only cancels the work workqueue and not
> > the waker workqueue. Could that be the problem.
> 
> It's the waker workqueue that Rafael apparently sees with the debug patch 
> from Oleg, so yeah, that sounds possible.
> 
> Rafael, since apparently htusb_close() _is_ called, does the following 
> simpler patch fix it for you? I bet your patch does it too.

Yes and yes.

And in fact this is a post-2.6.31 regression introduced by commit
7bee549e197c9c0e92b89857a409675c1d5e9dff (Bluetooth: Add USB autosuspend
support to btusb driver).

Thanks,
Rafael
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