[PATCH] iio: ade7753: avoid uninitialized data

[PATCH] iio: ade7753: avoid uninitialized data

[Arnd Bergmann]

The ade7753_spi_read_reg_16() will either successfully read a value
from SPI, or return a failure code without delivering data. However,
the ade7753_stop_device() and ade7753_reset() functions use the returned
data without checking for an error condition first. Gcc detects this
as a possible bug and warns about it:

drivers/staging/iio/meter/ade7753.c: In function 'ade7753_remove':
drivers/staging/iio/meter/ade7753.c:348:6: error: 'val' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  val |= BIT(4);  /* AD converters can be turned off */
      ^
drivers/staging/iio/meter/ade7753.c:345:6: note: 'val' was declared here
  u16 val;
      ^
drivers/staging/iio/meter/ade7753.c: In function 'ade7753_probe':
drivers/staging/iio/meter/ade7753.c:222:6: error: 'val' may be used uninitialized in this function [-Werror=maybe-uninitialized]

In both cases, we can avoids the warning by checking the return code
before using the data.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/staging/iio/meter/ade7753.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/iio/meter/ade7753.c b/drivers/staging/iio/meter/ade7753.c
index f129039bece3..69287108f793 100644
--- a/drivers/staging/iio/meter/ade7753.c
+++ b/drivers/staging/iio/meter/ade7753.c
@@ -217,8 +217,12 @@ error_ret:
 static int ade7753_reset(struct device *dev)
 {
 	u16 val;
+	int ret;
+
+	ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
+	if (ret)
+		return ret;
 
-	ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
 	val |= BIT(6); /* Software Chip Reset */
 
 	return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
@@ -343,8 +347,12 @@ error_ret:
 static int ade7753_stop_device(struct device *dev)
 {
 	u16 val;
+	int ret;
+
+	ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
+	if (ret)
+		return ret;
 
-	ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
 	val |= BIT(4);  /* AD converters can be turned off */
 
 	return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
-- 
2.7.0

[PATCH] iio: ade7753: avoid uninitialized data

[Jonathan Cameron]

On 25/01/16 15:52, Arnd Bergmann wrote:
> The ade7753_spi_read_reg_16() will either successfully read a value
> from SPI, or return a failure code without delivering data. However,
> the ade7753_stop_device() and ade7753_reset() functions use the returned
> data without checking for an error condition first. Gcc detects this
> as a possible bug and warns about it:
> 
> drivers/staging/iio/meter/ade7753.c: In function 'ade7753_remove':
> drivers/staging/iio/meter/ade7753.c:348:6: error: 'val' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>   val |= BIT(4);  /* AD converters can be turned off */
>       ^
> drivers/staging/iio/meter/ade7753.c:345:6: note: 'val' was declared here
>   u16 val;
>       ^
> drivers/staging/iio/meter/ade7753.c: In function 'ade7753_probe':
> drivers/staging/iio/meter/ade7753.c:222:6: error: 'val' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> In both cases, we can avoids the warning by checking the return code
> before using the data.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Thanks.

Applied to the togreg branch of iio.git - initially pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan
> ---
>  drivers/staging/iio/meter/ade7753.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/iio/meter/ade7753.c b/drivers/staging/iio/meter/ade7753.c
> index f129039bece3..69287108f793 100644
> --- a/drivers/staging/iio/meter/ade7753.c
> +++ b/drivers/staging/iio/meter/ade7753.c
> @@ -217,8 +217,12 @@ error_ret:
>  static int ade7753_reset(struct device *dev)
>  {
>  	u16 val;
> +	int ret;
> +
> +	ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
> +	if (ret)
> +		return ret;
>  
> -	ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
>  	val |= BIT(6); /* Software Chip Reset */
>  
>  	return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
> @@ -343,8 +347,12 @@ error_ret:
>  static int ade7753_stop_device(struct device *dev)
>  {
>  	u16 val;
> +	int ret;
> +
> +	ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
> +	if (ret)
> +		return ret;
>  
> -	ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
>  	val |= BIT(4);  /* AD converters can be turned off */
>  
>  	return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
>