Re: [PATCH V2 1/2] iio: meter: ade7754: add error handling in _reset and _stop_device

[Jonathan Cameron <jic23@kernel.org>]

On 02/01/15 09:02, Devendra Naga wrote:
> This patch adds the error handling for the value returned from
> ade7754_spi_read_reg_8. With this patch, the following randconfig
> warnings get fixed automatically.
> 
> drivers/staging/iio/meter/ade7754.c:222:6: warning: ‘val’ may be used
> uninitialized in this function [-Wmaybe-uninitialized]
> drivers/staging/iio/meter/ade7754.c:368:6: warning: ‘val’ may be used
> uninitialized in this function [-Wmaybe-uninitialized]
> 
> Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Looks good to me.  A Hartmut reviewed the original patch I'll leave it
a few days to see if he wants to take a look at the update.

Thanks,

Jonathan
> ---
> 
>  Hello, 
> 
>  Please see if this is the error message you wanted.
> 
>  Build tested on next-20141231 with randconfig sent to iio ml,
>  and with allmodconfig.
> 
>  drivers/staging/iio/meter/ade7754.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/iio/meter/ade7754.c b/drivers/staging/iio/meter/ade7754.c
> index 81f6731..746b188 100644
> --- a/drivers/staging/iio/meter/ade7754.c
> +++ b/drivers/staging/iio/meter/ade7754.c
> @@ -216,9 +216,13 @@ error_ret:
>  
>  static int ade7754_reset(struct device *dev)
>  {
> +	int ret;
>  	u8 val;
>  
> -	ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
> +	ret = ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
> +	if (ret < 0)
> +		return ret;
> +
>  	val |= 1 << 6; /* Software Chip Reset */
>  	return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
>  }
> @@ -362,9 +366,16 @@ error_ret:
>  /* Power down the device */
>  static int ade7754_stop_device(struct device *dev)
>  {
> +	int ret;
>  	u8 val;
>  
> -	ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
> +	ret = ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
> +	if (ret < 0) {
> +		dev_err(dev, "unable to power down the device, error: %d",
> +			ret);
> +		return ret;
> +	}
> +
>  	val |= 7 << 3;  /* ADE7754 powered down */
>  	return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
>  }
>