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

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Message-ID: <YqCNuJ3RQX3jIy59@smile.fi.intel.com>
Date:   Wed, 8 Jun 2022 14:53:28 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.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 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()...

-- 
With Best Regards,
Andy Shevchenko