Re: [PATCH v1 1/2] driver core: Introduce device_find_first_child() helper

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

On Wed, Jun 08, 2022 at 02:53:28PM +0300, Andy Shevchenko wrote:
> On Wed, Jun 08, 2022 at 01:29:08PM +0200, Rafael J. Wysocki wrote:
> > On Tue, Jun 7, 2022 at 10:22 PM Andy Shevchenko
> > <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> 
> ...
> 
> > I would define it as
> > 
> > static int match_first(struct device *dev, void *)
> > {
> >        return 1;
> > }
> > 
> > struct device *device_find_first_child(struct device *parent)
> > {
> >         return device_find_first_child(parent, NULL, match_first);
> > }
> > EXPORT_SYMBOL_GPL(device_find_first_child);
> > 
> > which is not that much more overhead.
> 
> With this we actually may simply provide a match function and it will make the
> clean ups (like patch 2 in the series) almost the same without introducing a
> device core call.
> 
> Something like
> 
> int device_match_any_for_find(struct device *dev, void *unused)
> {
> 	return 1;
> }
> 
> As I replied to Greg it's pity we can't use device_match_any()...

	int device_match_any(struct device *dev, const void *unused)

How is that not ok to use here?

thanks,

greg k-h