linux-kernel - Re: [PATCH 1/6] PM / devfreq: Fix the checkpatch warnings

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Date:   Thu, 24 Nov 2016 19:46:17 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Joe Perches <joe@...ches.com>, myungjoo.ham@...sung.com,
        kyungmin.park@...sung.com
Cc:     rjw@...ysocki.net, chanwoo@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] PM / devfreq: Fix the checkpatch warnings

On 2016년 11월 24일 19:20, Joe Perches wrote:
> On Thu, 2016-11-24 at 14:01 +0900, Chanwoo Choi wrote:
>> This patch just fixes the checkpatch warnings.
> 
> unrelated trivia:
> 
>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> []
>> @@ -538,15 +538,14 @@ struct devfreq *devfreq_add_device(struct device *dev,
>>  	devfreq = find_device_devfreq(dev);
>>  	mutex_unlock(&devfreq_list_lock);
>>  	if (!IS_ERR(devfreq)) {
>> -		dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__);
>> +		dev_err(dev, "%s: Unable to create devfreq for the device.\n",
>> +			__func__);
>>  		err = -EINVAL;
>>  		goto err_out;
>>  	}
> 
> It seems to be simpler if find_device_devfreq just returned NULL
> in the error cases as the only test is IS_ERR and not a
> specific error return type.  Then these IS_ERR calls could be
> a NULL pointer test instead.
> 
>> @@ -576,11 +575,13 @@ struct devfreq *devfreq_add_device(struct device *dev,
>>  		goto err_out;
>>  	}
>>  
>> -	devfreq->trans_table =	devm_kzalloc(&devfreq->dev, sizeof(unsigned int) *
>> +	devfreq->trans_table =	devm_kzalloc(&devfreq->dev,
>> +						sizeof(unsigned int) *
>>  						devfreq->profile->max_state *
>>  						devfreq->profile->max_state,
>>  						GFP_KERNEL);
>> -	devfreq->time_in_state = devm_kzalloc(&devfreq->dev, sizeof(unsigned long) *
>> +	devfreq->time_in_state = devm_kzalloc(&devfreq->dev,
>> +						sizeof(unsigned long) *
>>  						devfreq->profile->max_state,
>>  						GFP_KERNEL);
> 
> Maybe these should be devm_kcalloc calls

Why should devfreq use the devm_kcalloc?

> 
>>  	devfreq->last_stat_updated = jiffies;
>> @@ -990,7 +991,7 @@ static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr,
>>  
>>  	if (devfreq->profile->get_cur_freq &&
>>  		!devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
>> -			return sprintf(buf, "%lu\n", freq);
>> +		return sprintf(buf, "%lu\n", freq);
> 
> Be nicer to align the second line in the if test here too
> 
> 	if (devfreq->profile->get_cur_freq &&
> 	    !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
> 		return sprintf(buf, "%lu\n", freq); 
> 
>>  	return sprintf(buf, "%lu\n", devfreq->previous_freq);
>>  }
> 
> 
> 


-- 
Best Regards,
Chanwoo Choi