2015-04-16 09:31:12

by Karol Wrona

[permalink] [raw]
Subject: [PATCH] iio: common: ssp_sensors: Fix uninitialized warning for timestamp

calculated_time variable caused warning as uninitialized. It was not harmful
because it was evaluated in the path in which was used later but it is to
satisfy the checkers.

Signed-off-by: Karol Wrona <[email protected]>
---
drivers/iio/common/ssp_sensors/ssp_iio.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
index a3ae165..16180e6 100644
--- a/drivers/iio/common/ssp_sensors/ssp_iio.c
+++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
@@ -80,7 +80,7 @@ int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
unsigned int len, int64_t timestamp)
{
__le32 time;
- int64_t calculated_time;
+ int64_t calculated_time = 0;
struct ssp_sensor_data *spd = iio_priv(indio_dev);

if (indio_dev->scan_bytes == 0)
--
1.7.9.5


2015-04-18 19:02:53

by Jonathan Cameron

[permalink] [raw]
Subject: Re: [PATCH] iio: common: ssp_sensors: Fix uninitialized warning for timestamp

On 16/04/15 10:30, Karol Wrona wrote:
> calculated_time variable caused warning as uninitialized. It was not harmful
> because it was evaluated in the path in which was used later but it is to
> satisfy the checkers.
>
> Signed-off-by: Karol Wrona <[email protected]>
Dumb compiler. It's a false positive and as the function is an inline in the header,
it should be able to tell.

What compiler is spitting out the warning?

> ---
> drivers/iio/common/ssp_sensors/ssp_iio.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
> index a3ae165..16180e6 100644
> --- a/drivers/iio/common/ssp_sensors/ssp_iio.c
> +++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
> @@ -80,7 +80,7 @@ int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
> unsigned int len, int64_t timestamp)
> {
> __le32 time;
> - int64_t calculated_time;
> + int64_t calculated_time = 0;
> struct ssp_sensor_data *spd = iio_priv(indio_dev);
>
> if (indio_dev->scan_bytes == 0)
>

2015-04-24 11:10:25

by Karol Wrona

[permalink] [raw]
Subject: Re: [PATCH] iio: common: ssp_sensors: Fix uninitialized warning for timestamp

On 04/18/2015 09:02 PM, Jonathan Cameron wrote:
> On 16/04/15 10:30, Karol Wrona wrote:
>> calculated_time variable caused warning as uninitialized. It was not harmful
>> because it was evaluated in the path in which was used later but it is to
>> satisfy the checkers.
>>
>> Signed-off-by: Karol Wrona <[email protected]>
> Dumb compiler. It's a false positive and as the function is an inline in the header,
> it should be able to tell.
>
> What compiler is spitting out the warning?


You should have krobot complain in the mail.
Subject: "include/linux/iio/buffer.h:142:32: warning: 'calculated_time'
may be used uninitialized in this function"

This was sh compiler. I suppose that we can treat it as false warning.
It will complain whenever the variable will stay uninitialized even if
not used in such path.


>
>> ---
>> drivers/iio/common/ssp_sensors/ssp_iio.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
>> index a3ae165..16180e6 100644
>> --- a/drivers/iio/common/ssp_sensors/ssp_iio.c
>> +++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
>> @@ -80,7 +80,7 @@ int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
>> unsigned int len, int64_t timestamp)
>> {
>> __le32 time;
>> - int64_t calculated_time;
>> + int64_t calculated_time = 0;
>> struct ssp_sensor_data *spd = iio_priv(indio_dev);
>>
>> if (indio_dev->scan_bytes == 0)
>>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in
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>

2015-04-26 17:01:38

by Jonathan Cameron

[permalink] [raw]
Subject: Re: [PATCH] iio: common: ssp_sensors: Fix uninitialized warning for timestamp

On 24/04/15 12:10, Karol Wrona wrote:
> On 04/18/2015 09:02 PM, Jonathan Cameron wrote:
>> On 16/04/15 10:30, Karol Wrona wrote:
>>> calculated_time variable caused warning as uninitialized. It was not harmful
>>> because it was evaluated in the path in which was used later but it is to
>>> satisfy the checkers.
>>>
>>> Signed-off-by: Karol Wrona <[email protected]>
>> Dumb compiler. It's a false positive and as the function is an inline in the header,
>> it should be able to tell.
>>
>> What compiler is spitting out the warning?
>
>
> You should have krobot complain in the mail.
> Subject: "include/linux/iio/buffer.h:142:32: warning: 'calculated_time'
> may be used uninitialized in this function"
>
> This was sh compiler. I suppose that we can treat it as false warning.
> It will complain whenever the variable will stay uninitialized even if
> not used in such path.
Yup. Seems false to me. Could report it if you are really bored :)
>
>
>>
>>> ---
>>> drivers/iio/common/ssp_sensors/ssp_iio.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
>>> index a3ae165..16180e6 100644
>>> --- a/drivers/iio/common/ssp_sensors/ssp_iio.c
>>> +++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
>>> @@ -80,7 +80,7 @@ int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
>>> unsigned int len, int64_t timestamp)
>>> {
>>> __le32 time;
>>> - int64_t calculated_time;
>>> + int64_t calculated_time = 0;
>>> struct ssp_sensor_data *spd = iio_priv(indio_dev);
>>>
>>> if (indio_dev->scan_bytes == 0)
>>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-iio" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>