On 05/01/15 05:57, sanjeev sharma wrote:
> On Fri, Jan 2, 2015 at 2:32 PM, Devendra Naga <[email protected]> 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 <[email protected]>
>> ---
>>
>> 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)
>
> IMO,we should have consistent change throughout and here also we
> should use dev_err in failure scenario.
That would perhaps be an additional improvement, but the patch as it
stands is still a good thing so applied. Feel free to follow up
with additional debugging information.
>> + 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);
>> }
>> --
>> 1.9.3
>>
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