linux-kernel - Re: [PATCH v2 1/2] gpiolib: Provide to_gpio

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Date:   Tue, 29 Nov 2022 13:50:51 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v2 1/2] gpiolib: Provide to_gpio_device() helper

On Mon, Nov 28, 2022 at 8:00 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> Provide to_gpio_device() helper which can be utilized in the existing
> and future code.
>
> While at it, make sure it becomes no-op at compilation time.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v2: made helper static inline (Bart)
>  drivers/gpio/gpiolib.c | 2 +-
>  drivers/gpio/gpiolib.h | 9 +++++++--
>  2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a11480634213..ccd47da4ec66 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -548,7 +548,7 @@ EXPORT_SYMBOL_GPL(gpiochip_line_is_valid);
>
>  static void gpiodevice_release(struct device *dev)
>  {
> -       struct gpio_device *gdev = container_of(dev, struct gpio_device, dev);
> +       struct gpio_device *gdev = to_gpio_device(dev);
>         unsigned long flags;
>
>         spin_lock_irqsave(&gpio_lock, flags);
> diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
> index d900ecdbac46..e443c1023a37 100644
> --- a/drivers/gpio/gpiolib.h
> +++ b/drivers/gpio/gpiolib.h
> @@ -20,9 +20,9 @@
>
>  /**
>   * struct gpio_device - internal state container for GPIO devices
> - * @id: numerical ID number for the GPIO chip
>   * @dev: the GPIO device struct
>   * @chrdev: character device for the GPIO device
> + * @id: numerical ID number for the GPIO chip
>   * @mockdev: class device used by the deprecated sysfs interface (may be
>   * NULL)
>   * @owner: helps prevent removal of modules exporting active GPIOs
> @@ -47,9 +47,9 @@
>   * userspace.
>   */
>  struct gpio_device {
> -       int                     id;

Sorry I didn't notice it before but why the churn? This is not needed
for container_of to work.

Bart

>         struct device           dev;
>         struct cdev             chrdev;
> +       int                     id;
>         struct device           *mockdev;
>         struct module           *owner;
>         struct gpio_chip        *chip;
> @@ -72,6 +72,11 @@ struct gpio_device {
>  #endif
>  };
>
> +static inline struct gpio_device *to_gpio_device(struct device *dev)
> +{
> +       return container_of(dev, struct gpio_device, dev);
> +}
> +
>  /* gpio suffixes used for ACPI and device tree lookup */
>  static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
>
> --
> 2.35.1
>