linux-kernel - Re: [PATCH v1 1/2] driver core: Introduce device_find_first

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Date:   Wed, 8 Jun 2022 14:04:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] driver core: Introduce device_find_first_child()
 helper

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@...ux.intel.com> 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