Re: [PATCH 2/3] gpiolib: provide gpiod_to_gpio_device()

[Andy Shevchenko]

On Wed, Oct 11, 2023 at 4:02 PM Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
>
> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>
> Accessing struct gpio_chip backing a GPIO device is only allowed for the
> actual providers of that chip.
>
> Similarly to how we introduced gpio_device_find() in order to replace
> the abused gpiochip_find(), let's introduce a counterpart to
> gpiod_to_chip() that returns a reference to the GPIO device owning the
> descriptor. This is done in order to later remove gpiod_to_chip()
> entirely.

My concern with this API is the following scenario:
1. One driver requests the GPIO descriptor.
2. Another driver does take an arbitrary number, converts to a
descriptor and calls for this API.

Is there any (potential) problem?

-- 
With Best Regards,
Andy Shevchenko