linux-kernel - Re: [PATCH 01/10] iio: gyro: adis16136: check ret val for non-zero vs less-than-zero

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Message-ID: <20191103101546.47ceb7a2@archlinux>
Date:   Sun, 3 Nov 2019 10:15:46 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <dragos.bogdan@...log.com>
Subject: Re: [PATCH 01/10] iio: gyro: adis16136: check ret val for non-zero
 vs less-than-zero

On Fri, 1 Nov 2019 11:34:56 +0200
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> The ADIS library functions return zero on success, and negative values for
> error. Positive values aren't returned, but we only care about the success
> value (which is zero).
> 
> This change is mostly needed so that the compiler won't make any inferences
> about some about values being potentially un-initialized. This only
> triggers after making some functions inline, because the compiler can
> better follow return paths.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to work their magic.

Thanks,

Jonathan

> ---
>  drivers/iio/gyro/adis16136.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/iio/gyro/adis16136.c b/drivers/iio/gyro/adis16136.c
> index 5bec7ad53d8b..d637d52d051a 100644
> --- a/drivers/iio/gyro/adis16136.c
> +++ b/drivers/iio/gyro/adis16136.c
> @@ -80,19 +80,19 @@ static ssize_t adis16136_show_serial(struct file *file,
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SERIAL_NUM,
>  		&serial);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_LOT1, &lot1);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_LOT2, &lot2);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_LOT3, &lot3);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	len = snprintf(buf, sizeof(buf), "%.4x%.4x%.4x-%.4x\n", lot1, lot2,
> @@ -116,7 +116,7 @@ static int adis16136_show_product_id(void *arg, u64 *val)
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_PROD_ID,
>  		&prod_id);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	*val = prod_id;
> @@ -134,7 +134,7 @@ static int adis16136_show_flash_count(void *arg, u64 *val)
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_FLASH_CNT,
>  		&flash_count);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	*val = flash_count;
> @@ -191,7 +191,7 @@ static int adis16136_get_freq(struct adis16136 *adis16136, unsigned int *freq)
>  	int ret;
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_SMPL_PRD, &t);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	*freq = 32768 / (t + 1);
> @@ -228,7 +228,7 @@ static ssize_t adis16136_read_frequency(struct device *dev,
>  	int ret;
>  
>  	ret = adis16136_get_freq(adis16136, &freq);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	return sprintf(buf, "%d\n", freq);
> @@ -256,7 +256,7 @@ static int adis16136_set_filter(struct iio_dev *indio_dev, int val)
>  	int i, ret;
>  
>  	ret = adis16136_get_freq(adis16136, &freq);
> -	if (ret < 0)
> +	if (ret)
>  		return ret;
>  
>  	for (i = ARRAY_SIZE(adis16136_3db_divisors) - 1; i >= 1; i--) {
> @@ -277,11 +277,11 @@ static int adis16136_get_filter(struct iio_dev *indio_dev, int *val)
>  	mutex_lock(&indio_dev->mlock);
>  
>  	ret = adis_read_reg_16(&adis16136->adis, ADIS16136_REG_AVG_CNT, &val16);
> -	if (ret < 0)
> +	if (ret)
>  		goto err_unlock;
>  
>  	ret = adis16136_get_freq(adis16136, &freq);
> -	if (ret < 0)
> +	if (ret)
>  		goto err_unlock;
>  
>  	*val = freq / adis16136_3db_divisors[val16 & 0x07];
> @@ -318,7 +318,7 @@ static int adis16136_read_raw(struct iio_dev *indio_dev,
>  	case IIO_CHAN_INFO_CALIBBIAS:
>  		ret = adis_read_reg_32(&adis16136->adis,
>  			ADIS16136_REG_GYRO_OFF2, &val32);
> -		if (ret < 0)
> +		if (ret)
>  			return ret;
>  
>  		*val = sign_extend32(val32, 31);