linux-kernel - Re: [RFT PATCH 15/21] arm: omap1: ams-delta: stop using gpiochip

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Message-ID: <CACRpkdaLKqNM1xMCo9jz1Pe_18A=GJodbaTHL+VmoRZa5jJbjQ@mail.gmail.com>
Date:   Thu, 7 Sep 2023 09:35:18 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dipen Patel <dipenp@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, timestamp@...ts.linux.dev,
        linux-tegra@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFT PATCH 15/21] arm: omap1: ams-delta: stop using gpiochip_find()

Oops one more note:

On Tue, Sep 5, 2023 at 8:53 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> gpiochip_find() is going away as it's not hot-unplug safe. This platform
> is not affected by any of the related problems as this GPIO controller
> cannot really go away but in order to finally remove this function, we
> need to convert it to using gpio_device_find() as well.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
(...)
> +       struct gpio_device *gdev;
(...)
> +       gdev = gpio_device_find_by_label(OMAP_GPIO_LABEL);

This leaves a reference to the gdev right? No scoped guard?

If you leave a dangling reference intentionally I think it warrants
a comment ("leaving a ref here so the device will never be
free:ed").

Yours,
Linus Walleij