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SubjectRe: [PATCH v2 03/11] gpiolib: convert the type of hwnum to unsigned int in gpiochip_get_desc()
On Wed, Dec 4, 2019 at 6:04 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> gpiochip_get_desc() takes a u16 hwnum, but it turns out most users don't
> respect that and usually pass an unsigned int. Since implicit casting to
> a smaller type is dangerous - let's change the type of hwnum to unsigned
> int in gpiochip_get_desc() and in gpiochip_request_own_desc() where the
> size of hwnum is not respected either and who's a user of the former.
>
> This is safe as we then check the hwnum against the number of lines
> before proceeding in gpiochip_get_desc().
>

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
> drivers/gpio/gpiolib.c | 5 +++--
> drivers/gpio/gpiolib.h | 3 ++-
> include/linux/gpio/driver.h | 3 ++-
> 3 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 72211407469f..b3ffb079e323 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -140,7 +140,7 @@ EXPORT_SYMBOL_GPL(gpio_to_desc);
> * in the given chip for the specified hardware number.
> */
> struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
> - u16 hwnum)
> + unsigned int hwnum)
> {
> struct gpio_device *gdev = chip->gpiodev;
>
> @@ -2990,7 +2990,8 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
> * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error
> * code on failure.
> */
> -struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
> +struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip,
> + unsigned int hwnum,
> const char *label,
> enum gpio_lookup_flags lflags,
> enum gpiod_flags dflags)
> diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
> index ca9bc1e4803c..a1cbeabadc69 100644
> --- a/drivers/gpio/gpiolib.h
> +++ b/drivers/gpio/gpiolib.h
> @@ -78,7 +78,8 @@ struct gpio_array {
> unsigned long invert_mask[];
> };
>
> -struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
> +struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
> + unsigned int hwnum);
> int gpiod_get_array_value_complex(bool raw, bool can_sleep,
> unsigned int array_size,
> struct gpio_desc **desc_array,
> diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
> index e2480ef94c55..4f032de10bae 100644
> --- a/include/linux/gpio/driver.h
> +++ b/include/linux/gpio/driver.h
> @@ -715,7 +715,8 @@ gpiochip_remove_pin_ranges(struct gpio_chip *chip)
>
> #endif /* CONFIG_PINCTRL */
>
> -struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
> +struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip,
> + unsigned int hwnum,
> const char *label,
> enum gpio_lookup_flags lflags,
> enum gpiod_flags dflags);
> --
> 2.23.0
>


--
With Best Regards,
Andy Shevchenko

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