On Wednesday 30 March 2005 21:16, Patrick Mochel wrote:
>
> On Tue, 29 Mar 2005, Alan Stern wrote:
>
> > On Mon, 28 Mar 2005, Patrick Mochel wrote:
> >
> > > How is this related to (8) above? Do you need some sort of protected,
> > > short path through the core to add the device, but not bind it or add it
> > > to the PM core?
> >
> > Having thought it through, I believe all we need for USB support is this:
> >
> > Whenever usb_register() in the USB core calls driver_register()
> > and the call filters down to driver_attach(), that routine
> > should lock dev->parent->sem before calling driver_probe_device()
> > (and unlock it afterward, of course).
> >
> > (For the corresponding remove pathway, where usb_deregister()
> > calls driver_unregister(), it would be nice if __remove_driver()
> > locked dev->parent->sem before calling device_release_driver().
> > This is not really needed, however, since USB drivers aren't
> > supposed to touch the device in their disconnect() method.)
>
>
> Why can't you just lock it in ->probe() and ->remove() yourself?
>
Will the lock be exported (via helper functions)? I always felt dirty using
subsys.rwsem because it I think it was supposed to be implementation detail.
--
Dmitry
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