Re: [PATCH v2 06/11] gpiolib: use gpiochip_get_desc() in gpio_ioctl()

[Andy Shevchenko <andy.shevchenko@xxxxxxxxx>]

On Wed, Dec 4, 2019 at 6:04 PM Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>
> Unduplicate the offset check by simply calling gpiochip_get_desc() and
> checking its return value.
>

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


> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> ---
>  drivers/gpio/gpiolib.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 17796437d7be..b7043946c029 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1175,10 +1175,11 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>
>                 if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
>                         return -EFAULT;
> -               if (lineinfo.line_offset >= gdev->ngpio)
> -                       return -EINVAL;
>
> -               desc = &gdev->descs[lineinfo.line_offset];
> +               desc = gpiochip_get_desc(chip, lineinfo.line_offset);
> +               if (IS_ERR(desc))
> +                       return PTR_ERR(desc);
> +
>                 if (desc->name) {
>                         strncpy(lineinfo.name, desc->name,
>                                 sizeof(lineinfo.name));
> --
> 2.23.0
>


-- 
With Best Regards,
Andy Shevchenko