linux-kernel - Re: [PATCH] iio: inkern: fix a static checker error

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Message-ID: <7b6ad5b7-a538-9007-8981-f36f9877a8e3@axentia.se>
Date:   Thu, 20 Apr 2017 23:13:51 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        <linux-kernel@...r.kernel.org>
CC:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        <linux-iio@...r.kernel.org>
Subject: Re: [PATCH] iio: inkern: fix a static checker error

On 2017-04-20 23:12, Lars-Peter Clausen wrote:
> On 04/20/2017 11:01 PM, Peter Rosin wrote:
>> Avoid this smatch error:
>> drivers/iio/inkern.c:751 iio_read_avail_channel_raw() error: double unlock 'mutex:&chan->indio_dev->info_exist_lock'
> 
> Looks good, but it's not just the smatch error, this is a real issue. This
> even seems to be a endless loop, always jumping back to err_unlock.

Yes, it should probably go to stable too...

>>
>> Fixes: 00c5f80c2fad ("iio: inkern: add helpers to query available values from channels")
>> Signed-off-by: Peter Rosin <peda@...ntia.se>
> 
>> ---
>>  drivers/iio/inkern.c | 4 +---
>>  1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
>> index 7a13535dc3e9..a3941bade6a7 100644
>> --- a/drivers/iio/inkern.c
>> +++ b/drivers/iio/inkern.c
>> @@ -750,11 +750,9 @@ int iio_read_avail_channel_raw(struct iio_channel *chan,
>>  err_unlock:
>>  	mutex_unlock(&chan->indio_dev->info_exist_lock);
>>  
>> -	if (ret >= 0 && type != IIO_VAL_INT) {
>> +	if (ret >= 0 && type != IIO_VAL_INT)
>>  		/* raw values are assumed to be IIO_VAL_INT */
>>  		ret = -EINVAL;
>> -		goto err_unlock;
>> -	}
>>  
>>  	return ret;
>>  }
>>
>