linux-kernel - Re: [PATCH v4 03/11] gpiolib: provide gpio_device

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Message-ID: <ZRqQbzbcNHOtJm7z@smile.fi.intel.com>
Date:   Mon, 2 Oct 2023 12:42:07 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 03/11] gpiolib: provide gpio_device_find()

On Wed, Sep 27, 2023 at 04:29:23PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> gpiochip_find() is wrong and its kernel doc is misleading as the
> function doesn't return a reference to the gpio_chip but just a raw
> pointer. The chip itself is not guaranteed to stay alive, in fact it can
> be deleted at any point. Also: other than GPIO drivers themselves,
> nobody else has any business accessing gpio_chip structs.
> 
> Provide a new gpio_device_find() function that returns a real reference
> to the opaque gpio_device structure that is guaranteed to stay alive for
> as long as there are active users of it.

...

>  struct gpio_chip *gpiochip_find(void *data,
>  				int (*match)(struct gpio_chip *gc,

> +struct gpio_device *gpio_device_find(void *data,
> +				     int (*match)(struct gpio_chip *gc,
> +						  void *data))

Why not

typedef int (*gpio_chip_match_fn)(struct gpio_chip *gc, void *data);

?

-- 
With Best Regards,
Andy Shevchenko