On 2018년 04월 13일 10:03, Chanwoo Choi wrote:
> Hi,
> 
> I'm sorry for the late reply.
> 
> On 2018년 03월 30일 20:44, Arvind Yadav wrote:
>> Never directly free @dev after calling device_register() or
>> device_unregister(), even if device_register() returned an error.
>> Always use put_device() to give up the reference initialized.
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
>> ---
>>  drivers/devfreq/devfreq.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
>> index fe2af6a..a225b94 100644
>> --- a/drivers/devfreq/devfreq.c
>> +++ b/drivers/devfreq/devfreq.c
>> @@ -625,7 +625,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
>>      err = device_register(&devfreq->dev);
>>      if (err) {
>>              mutex_unlock(&devfreq->lock);
>> -            goto err_dev;
>> +            put_device(&devfreq->dev);
>> +            goto err_out;
> 
> why do you change the goto postion?
> err_out is correct to free the memory of devfreq instance.

Sorry. err_dev is correct instead of err_out.

> 
>>      }
>>  
>>      devfreq->trans_table =  devm_kzalloc(&devfreq->dev,
>> @@ -671,6 +672,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
>>      mutex_unlock(&devfreq_list_lock);
>>  
>>      device_unregister(&devfreq->dev);
>> +    devfreq = NULL;
> 
> It is wrong. If you initialize the devfreq as NULL,
> never free the 'devfreq' instance.
> 
>>  err_dev:
>>      if (devfreq)
>>              kfree(devfreq);
>>
> 
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics

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