On Tuesday 04 April 2006 20:23, Rene Herman wrote:
> Rene Herman wrote:
>
> > As said before, if the behaviour makes sense for other busses, maybe
> > propagating errors up should be dependent on a flags value somewhere
> > that a platform-driver sets?
> >
> > If platform_device_register_simple() never returns an IS_ERR() when the
> > device is not found that means it's not a useful interface for hardware
> > that needs to be probed for at the very least. ALSA would need to do
> > something like, just before returning a succesfull return from the
> > probe() method, set a global flag that the platform_device that is about
> > to be registered is actually representing something, and freeing all
> > platform_devices for which the flag is _not_ set again after this.
> >
> > Which ofcourse means this is not at all useful. It's just working around
> > the driver model then...
>
> Well, we could in fact hang an unregister off device->private_data as
> per attached example. Wouldn't be _excessively_ ugly. Still sucks
> though.
Plus it broke all the drivers that create platform devices before
registering drivers or the ones simply not using private data. Given
that some arches have a means to separate device creation from driver
probing (see pcspkr on PPC for exaple) I don;t think this is acceptable.
--
Dmitry
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