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Date:	Wed, 11 Nov 2009 22:13:30 +0100
From:	Oliver Neukum <>
To:	Marcel Holtmann <>
Cc:	Linus Torvalds <>,
	"Rafael J. Wysocki" <>,
	Thomas Gleixner <>,
	Mike Galbraith <>, Ingo Molnar <>,
	LKML <>,
	pm list <>,
	Greg KH <>,
	Jesse Barnes <>,
	Tejun Heo <>, Oleg Nesterov <>,
Subject: Re: GPF in run_workqueue()/list_del_init(cwq-> 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 21:18:39 schrieb Marcel Holtmann:
> > I'm looking at btusb_disconnect(), for example. It's one of the few BT 
> > drivers that seem to use workqueues, and I'm not seeing a 
> > cancel_work_sync() in the disconnect routine - but maybe the
> > btusb_close()  routine is called indirectly some way that I just don't
> > see.
> so the btusb_close() should be called before btusb_destruct() and the
> destruct() callback is only when the last reference count gets dropped
> and we do have to free the memory. So it seems we are doing something
> wrong in btusb_close(). The close() callback is triggered via
> hci_unregister_dev() from btusb_disconnect().
> As it seems the btusb_close() only cancels the work workqueue and not
> the waker workqueue. Could that be the problem.

Yes, btusb_close() needs to cancel the waker workqueue, too.
In addition, in order to avoid a memory leak it must call
to make sure any deferred data is destroyed.

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