linux-kernel - 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

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Date:	Wed, 11 Nov 2009 22:15:08 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Marcel Holtmann <marcel@...tmann.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)

Am Mittwoch, 11. November 2009 21:24:33 schrieb Oleg Nesterov:
> > So, it looks like the bug is in btusb_destruct(), which should call
> > cancel_work_sync() on data->waker before freeing 'data'.  I guess it
> > should do the same for data->work.
> 
> Or. btusb_suspend() and btusb_close() do cancel_work_sync(data->work),
> perhaps they should cancel data->waker as well, I dunno.
> 
> I added Oliver to cc.

btusb_close() must do it. btusb_suspend() must not do it.

	Regards
		Oliver
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