diff mbox series

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

Message ID 20191101093505.9408-2-alexandru.ardelean@analog.com (mailing list archive)
State New, archived
Headers show
Series iio: adis: cleanups and fixes | expand

Commit Message

Alexandru Ardelean Nov. 1, 2019, 9:34 a.m. UTC 
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@analog.com>
---
 drivers/iio/gyro/adis16136.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

Comments

Jonathan Cameron Nov. 3, 2019, 10:15 a.m. UTC | #1 
On Fri, 1 Nov 2019 11:34:56 +0200
Alexandru Ardelean <alexandru.ardelean@analog.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@analog.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);
diff mbox series

Patch

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);