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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Mon, 8 Mar 2021 14:36:27 +0100
Message-ID: <CAJZ5v0ijOhT3PVm6-gqnqycE-YZhD00dGbtK1UEV5nfrOF5Obw@mail.gmail.com>
Subject: Re: [PATCH v3 1/6] ACPI: scan: Extend acpi_walk_dep_device_list()
To:     Andy Shevchenko <andy.shevchenko@gmail.com>,
        Daniel Scally <djrscally@gmail.com>
Cc:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Tomasz Figa <tfiga@chromium.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Rajmohan Mani <rajmohan.mani@intel.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Len Brown <lenb@kernel.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Wolfram Sang <wsa@kernel.org>,
        Lee Jones <lee.jones@linaro.org>,
        Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Hans de Goede <hdegoede@redhat.com>,
        Mark Gross <mgross@linux.intel.com>,
        Maximilian Luz <luzmaximilian@gmail.com>,
        Robert Moore <robert.moore@intel.com>,
        Erik Kaneda <erik.kaneda@intel.com>, me@fabwu.ch,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
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        Platform Driver <platform-driver-x86@vger.kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@acpica.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>
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On Sun, Mar 7, 2021 at 9:39 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Sun, Mar 7, 2021 at 3:36 PM Daniel Scally <djrscally@gmail.com> wrote:
> > On 22/02/2021 13:34, Andy Shevchenko wrote:
> > > On Mon, Feb 22, 2021 at 3:12 PM Daniel Scally <djrscally@gmail.com> wrote:
> > >> The acpi_walk_dep_device_list() is not as generalisable as its name
> > >> implies, serving only to decrement the dependency count for each
> > >> dependent device of the input. Extend the function to instead accept
> > >> a callback which can be applied to all the dependencies in acpi_dep_list.
> > >> Replace all existing calls to the function with calls to a wrapper, passing
> > >> a callback that applies the same dependency reduction.
> > > The code looks okay to me, if it was the initial idea, feel free to add
> > > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> >
> >
> > Thank you!
> >
> >
> > >> + */
> > >> +void acpi_dev_flag_dependency_met(acpi_handle handle)
> > >> +{
> > > Since it's acpi_dev_* namespace, perhaps it should take struct acpi_device here?
> >
> >
> > I can do this, but I avoided it because in most of the uses in the
> > kernel currently there's no struct acpi_device, they're just passing
> > ACPI_HANDLE(dev) instead, so I'd need to get the adev with
> > ACPI_COMPANION() in each place. It didn't seem worth it...

It may not even be possible sometimes, because that function may be
called before creating all of the struct acpi_device objects (like in
the case of deferred enumeration).

> > but happy to
> > do it if you'd prefer it that way?
>
> I see, let Rafael decide then. I'm not pushing here.

Well, it's a matter of correctness.