Re: [PATCH v5 05/10] iio: light: gp2ap020a00f: Fix possible error swallow

[Andy Shevchenko]

On Sun, Feb 22, 2026 at 09:40:15PM -0600, Ethan Tidmore wrote:
> Move error check into for loop in gp2ap020a00f_buffer_postenable() and
> gp2ap020a00f_buffer_predisable(), this fixes a possible error swallow.

...

> -	int i, err = 0;
> +	int i, err;

I believe we can't do that without introducing a 'default' case.

>  	guard(mutex)(&data->lock);
>  
> @@ -1366,11 +1366,10 @@ static int gp2ap020a00f_buffer_postenable(struct iio_dev *indio_dev)
>  					GP2AP020A00F_CMD_TRIGGER_PROX_EN);
>  			break;
>  		}
> +		if (err)
> +			return err;
>  	}
>  
> -	if (err < 0)
> -		return err;

(Also you might want to mention dropping '< 0' for making the style consistent
 taking into account that those functions won't return any positive values.)

>  	data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
>  	if (!data->buffer)
>  		return -ENOMEM;
> @@ -1381,7 +1380,7 @@ static int gp2ap020a00f_buffer_postenable(struct iio_dev *indio_dev)
>  static int gp2ap020a00f_buffer_predisable(struct iio_dev *indio_dev)
>  {
>  	struct gp2ap020a00f_data *data = iio_priv(indio_dev);
> -	int i, err = 0;
> +	int i, err;

Ditto.

>  	guard(mutex)(&data->lock);
>  
> @@ -1400,11 +1399,10 @@ static int gp2ap020a00f_buffer_predisable(struct iio_dev *indio_dev)
>  					GP2AP020A00F_CMD_TRIGGER_PROX_DIS);
>  			break;
>  		}
> +		if (err)
> +			return err;
>  	}
>  
> -	if (err)
> -		return err;
> -
>  	kfree(data->buffer);
>  	return 0;
>  }

-- 
With Best Regards,
Andy Shevchenko