wacom + runtime PM = AA deadlock

On Tue, Sep 14, 2010 at 08:07:39AM +0200, Oliver Neukum wrote:
> Am Dienstag, 14. September 2010, 02:52:10 schrieb Dmitry Torokhov:
> > On Mon, Sep 13, 2010 at 09:20:23PM +0200, Oliver Neukum wrote:
> > > Am Montag, 13. September 2010, 19:10:47 schrieb Dmitry Torokhov:
> > >
> > > > I think this introduces significant change in behavior though - before
> > > > we did not do usb_autopm_put_interface() on successful open, basically
> > > > disabling autopm facilities, right?
> > >
> > > Right. Which makes no sense at all. You'd better remove anything related
> > > to runtime PM and not set supports_autosuspend for that.
> > >
> >
> > That not what I meant, I do not want to remove autopm, it's just it was
> > effectively disabled and if we fix it we might start getting some
> > regression reports ;)
>
> True. So currently we have
>
> - a deadlock
> - disabled runtime power management
>
> We need to fix the deadlock. We can fix it retaining a disabled
> runtime power management. Or we can fix it fixing the runtime
> power management at the same time. However this opens
> the door to regressions. So for now I really suggest removing
> it from the driver and reintroduce it properly for the next merge
> window.
>

Lost track of this issue for a while. So I think we still need to fix
the deadlock for .36 and I think that the following will do that. Then
we'll adjust the driver to actually enable runtime PM for .37.

Thanks.
Acked-by: Oliver Neukum <oneukum@suse.de>

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