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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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