Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20210222130735.1313443-1-djrscally@gmail.com> <20210222130735.1313443-6-djrscally@gmail.com>
 <YDVfyt2d2Nhsa7l3@pendragon.ideasonboard.com> <1360fc85-3f39-1dce-eee9-c4e76c2087ae@gmail.com>
 <YDYmv0PpSndAlnDC@pendragon.ideasonboard.com>
In-Reply-To: <YDYmv0PpSndAlnDC@pendragon.ideasonboard.com>
From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Wed, 24 Feb 2021 12:18:43 +0200
Message-ID: <CAHp75VcKUjnwh4fi-mofooBuBYiqXjXOspU4twKg6-Lfvzf=QA@mail.gmail.com>
Subject: Re: [PATCH v3 5/6] platform/x86: Add intel_skl_int3472 driver
To:     Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc:     Daniel Scally <djrscally@gmail.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>,
        andy.shevchenko@linux.intel.com,
        kieran.bingham+renesas@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>,
        linux-i2c <linux-i2c@vger.kernel.org>,
        Platform Driver <platform-driver-x86@vger.kernel.org>,
        devel@acpica.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Wed, Feb 24, 2021 at 12:16 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
> On Tue, Feb 23, 2021 at 10:36:18PM +0000, Daniel Scally wrote:
> > On 23/02/2021 20:04, Laurent Pinchart wrote:

...

> > >> +  get_device(&int3472->sensor->dev);
> > >
> > > I see no corresponding put_device(), am I missing something ? I'm also
> > > not sure why this is needed.
> >
> > The put is acpi_dev_put() in skl_int3472_discrete_remove(); there seems
> > to be no acpi_dev_get() for some reason. We use the sensor acpi_device
> > to get the clock frequency, and to fetch the sensor module string, so I
> > thought it ought to hold a reference on those grounds.
>
> Shouldn't acpi_dev_get_dependent_dev() increase the reference count
> then, instead of doing it manually here ?

That's what I expected as well.
We have plenty of acpi_dev_get_*() and they do increase the reference
counter one way or the other.

-- 
With Best Regards,
Andy Shevchenko