[PATCH v1 0/1] iio: chemical: bme680: resolve issue reported by

[PATCH v1 0/1] iio: chemical: bme680: resolve issue reported by

[Vasileios Amoiridis]

According to Dan [1], the previous approach was prone to endianness and
variable initialization issues because of the typecasting of a s32 to
s16 variable. Fix this, by using a local variable and not reusing the
local ones.

[1]: https://lore.kernel.org/linux-iio/13f764f7-4cc4-4563-81f6-0393732729a6@stanley.mountain/

Vasileios Amoiridis (1):
  iio: chemical: bme680: use s16 variable for temp value to avoid
    casting

 drivers/iio/chemical/bme680_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
2.43.0

[PATCH v1] iio: chemical: bme680: use s16 variable for temp value to avoid casting

[Vasileios Amoiridis]

Use local s16 variable for the temperature channel to avoid casting it
later before passing it to the bme680_read_temp() function. This way,
possible endianness and initialization issues are avoided.

Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
---
 drivers/iio/chemical/bme680_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index 871921d81e70..6d11f9188367 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -741,6 +741,7 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
 {
 	struct bme680_data *data = iio_priv(indio_dev);
 	int chan_val, ret;
+	s16 temp_chan_val;
 
 	guard(mutex)(&data->lock);
 
@@ -757,11 +758,11 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_PROCESSED:
 		switch (chan->type) {
 		case IIO_TEMP:
-			ret = bme680_read_temp(data, (s16 *)&chan_val);
+			ret = bme680_read_temp(data, &temp_chan_val);
 			if (ret)
 				return ret;
 
-			*val = chan_val * 10;
+			*val = temp_chan_val * 10;
 			return IIO_VAL_INT;
 		case IIO_PRESSURE:
 			ret = bme680_read_press(data, &chan_val);
-- 
2.43.0

Re: [PATCH v1] iio: chemical: bme680: use s16 variable for temp value to avoid casting

[Jonathan Cameron]

On Thu, 31 Oct 2024 00:54:24 +0100
Vasileios Amoiridis <vassilisamir@gmail.com> wrote:

> Use local s16 variable for the temperature channel to avoid casting it
> later before passing it to the bme680_read_temp() function. This way,
> possible endianness and initialization issues are avoided.
> 
> Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>

Applied.

> ---
>  drivers/iio/chemical/bme680_core.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
> index 871921d81e70..6d11f9188367 100644
> --- a/drivers/iio/chemical/bme680_core.c
> +++ b/drivers/iio/chemical/bme680_core.c
> @@ -741,6 +741,7 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
>  {
>  	struct bme680_data *data = iio_priv(indio_dev);
>  	int chan_val, ret;
> +	s16 temp_chan_val;
>  
>  	guard(mutex)(&data->lock);
>  
> @@ -757,11 +758,11 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
>  	case IIO_CHAN_INFO_PROCESSED:
>  		switch (chan->type) {
>  		case IIO_TEMP:
> -			ret = bme680_read_temp(data, (s16 *)&chan_val);
> +			ret = bme680_read_temp(data, &temp_chan_val);
>  			if (ret)
>  				return ret;
>  
> -			*val = chan_val * 10;
> +			*val = temp_chan_val * 10;
>  			return IIO_VAL_INT;
>  		case IIO_PRESSURE:
>  			ret = bme680_read_press(data, &chan_val);