linux-kernel - Re: [PATCH] iio: adc: ina2xx: fix missing break statement

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Date:   Wed, 10 Oct 2018 08:59:19 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Matt Ranostay <matt.ranostay@...sulko.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        stefan.bruens@...h-aachen.de, linux-iio@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: ina2xx: fix missing break statement

On 10/10/18 08:51, Matt Ranostay wrote:
> On Tue, Oct 9, 2018 at 5:09 AM Colin King <colin.king@...onical.com> wrote:
>>
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The IIO_CHAN_INFO_SCALE case is missing a break statement and in
>> the unlikely event that chan->address is not matched in the nested
>> switch statement then the code falls through to the following
>> IIO_CHAN_INFO_HARDWAREGAIN case.  Fix this by adding the missing
>> break.   While we are fixing this, it's probably a good idea to
>> add in a break statement to the IIO_CHAN_INFO_HARDWAREGAIN case
>> too (this is a moot point).
>>
>> Detected by CoverityScan, CID#1462408 ("Missing break in switch")
> 
> I'm not familiar with running Coverity scans myself, but is this CID
> some publicly accessible report?
> If it is an in-house scan then it should be dropped IMHO

It is publicly accessible:

https://scan.coverity.com/projects/linux-next-weekly-scan

Colin

> 
> - Matt
> 
>>
>> Fixes: ca6a2d86acae ("iio: adc: ina2xx: Allow setting Shunt Voltage PGA gain and Bus Voltage range")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/iio/adc/ina2xx-adc.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
>> index d1239624187d..9bc5986780b9 100644
>> --- a/drivers/iio/adc/ina2xx-adc.c
>> +++ b/drivers/iio/adc/ina2xx-adc.c
>> @@ -250,6 +250,7 @@ static int ina2xx_read_raw(struct iio_dev *indio_dev,
>>                         *val2 = chip->shunt_resistor_uohm;
>>                         return IIO_VAL_FRACTIONAL;
>>                 }
>> +               break;
>>
>>         case IIO_CHAN_INFO_HARDWAREGAIN:
>>                 switch (chan->address) {
>> @@ -262,6 +263,7 @@ static int ina2xx_read_raw(struct iio_dev *indio_dev,
>>                         *val = chip->range_vbus == 32 ? 1 : 2;
>>                         return IIO_VAL_INT;
>>                 }
>> +               break;
>>         }
>>
>>         return -EINVAL;
>> --
>> 2.17.1
>>