Re: [PATCH 08/12] staging: iio: tsl2x7x: add error handling to tsl2x7x_prox_cal()

[Jonathan Cameron <jic23@kernel.org>]

On Sat,  3 Mar 2018 20:49:38 -0500
Brian Masney <masneyb@onstation.org> wrote:

> tsl2x7x_prox_cal() did not have any error checks. This patch adds
> the missing error handling and ensures that any errors are reported to
> user space via in_proximity0_calibrate_store().
> 
> Signed-off-by: Brian Masney <masneyb@onstation.org>
applied.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/light/tsl2x7x.c | 36 ++++++++++++++++++++++++++----------
>  1 file changed, 26 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/iio/light/tsl2x7x.c b/drivers/staging/iio/light/tsl2x7x.c
> index 380a6c96a69a..8adc6db44790 100644
> --- a/drivers/staging/iio/light/tsl2x7x.c
> +++ b/drivers/staging/iio/light/tsl2x7x.c
> @@ -807,10 +807,10 @@ static void tsl2x7x_prox_calculate(int *data, int length,
>   * Calculates a standard deviation based on the samples,
>   * and sets the threshold accordingly.
>   */
> -static void tsl2x7x_prox_cal(struct iio_dev *indio_dev)
> +static int tsl2x7x_prox_cal(struct iio_dev *indio_dev)
>  {
>  	int prox_history[MAX_SAMPLES_CAL + 1];
> -	int i;
> +	int i, ret;
>  	struct tsl2x7x_prox_stat prox_stat_data[2];
>  	struct tsl2x7x_prox_stat *cal;
>  	struct tsl2X7X_chip *chip = iio_priv(indio_dev);
> @@ -825,25 +825,33 @@ static void tsl2x7x_prox_cal(struct iio_dev *indio_dev)
>  	}
>  
>  	/* have to stop to change settings */
> -	tsl2x7x_chip_off(indio_dev);
> +	ret = tsl2x7x_chip_off(indio_dev);
> +	if (ret < 0)
> +		return ret;
>  
>  	/* Enable proximity detection save just in case prox not wanted yet*/
>  	tmp_irq_settings = chip->settings.interrupts_en;
>  	chip->settings.interrupts_en |= TSL2X7X_CNTL_PROX_INT_ENBL;
>  
>  	/*turn on device if not already on*/
> -	tsl2x7x_chip_on(indio_dev);
> +	ret = tsl2x7x_chip_on(indio_dev);
> +	if (ret < 0)
> +		return ret;
>  
>  	/*gather the samples*/
>  	for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
>  		usleep_range(15000, 17500);
> -		tsl2x7x_get_prox(indio_dev);
> +		ret = tsl2x7x_get_prox(indio_dev);
> +		if (ret < 0)
> +			return ret;
>  		prox_history[i] = chip->prox_data;
>  		dev_info(&chip->client->dev, "2 i=%d prox data= %d\n",
>  			 i, chip->prox_data);
>  	}
>  
> -	tsl2x7x_chip_off(indio_dev);
> +	ret = tsl2x7x_chip_off(indio_dev);
> +	if (ret < 0)
> +		return ret;
>  	cal = &prox_stat_data[PROX_STAT_CAL];
>  	tsl2x7x_prox_calculate(prox_history,
>  			       chip->settings.prox_max_samples_cal, cal);
> @@ -857,8 +865,13 @@ static void tsl2x7x_prox_cal(struct iio_dev *indio_dev)
>  
>  	/* back to the way they were */
>  	chip->settings.interrupts_en = tmp_irq_settings;
> -	if (current_state == TSL2X7X_CHIP_WORKING)
> -		tsl2x7x_chip_on(indio_dev);
> +	if (current_state == TSL2X7X_CHIP_WORKING) {
> +		ret = tsl2x7x_chip_on(indio_dev);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	return 0;
>  }
>  
>  static ssize_t
> @@ -1018,8 +1031,11 @@ static ssize_t in_proximity0_calibrate_store(struct device *dev,
>  	if (strtobool(buf, &value))
>  		return -EINVAL;
>  
> -	if (value)
> -		tsl2x7x_prox_cal(indio_dev);
> +	if (value) {
> +		ret = tsl2x7x_prox_cal(indio_dev);
> +		if (ret < 0)
> +			return ret;
> +	}
>  
>  	ret = tsl2x7x_invoke_change(indio_dev);
>  	if (ret < 0)