linux-kernel - Re: [PATCH 4/6] PM / devfreq: Set the freq

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Date:	Mon, 23 Nov 2015 07:29:43 +0000 (GMT)
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	최찬우 <cw00.choi@...sung.com>,
	박경민 <kyungmin.park@...sung.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 4/6] PM / devfreq: Set the freq_table of devfreq device

>   
>  This patch initialize the freq_table array of each devfreq device by using
> the devfreq_set_freq_table(). If freq_table is NULL, the devfreq framework
> is not able to support the frequency transtion information through sysfs.
> 
> The OPP core uses the integer type for the number of opps in the opp list
> and uses the 'unsigned long' type for each frequency. So, this patch modifies
> the type of some variable as following:
> - the type of freq_table : unsigned int -> unsigned long
> - the type of max_state  : unsigned int -> int
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
[]
> +/**
>   * devfreq_update_status() - Update statistics of devfreq behavior
>   * @devfreq:	the devfreq instance
>   * @freq:	the update target frequency
> @@ -477,7 +516,12 @@ struct devfreq *devfreq_add_device(struct device *dev,
>  	devfreq->previous_freq = profile->initial_freq;
>  	devfreq->data = data;
>  	devfreq->nb.notifier_call = devfreq_notifier_call;
> +	mutex_unlock(&devfreq->lock);
>  
> +	if (devfreq->profile->max_state <= 0 && !devfreq->profile->freq_table)
> +		devfreq_set_freq_table(devfreq);
> +
> +	mutex_lock(&devfreq->lock);

Anyway, what about modifying the block above as:

+	if (!devfreq->profile->max_state && !devfreq->profile->freq_table) {
+		mutex_unlock(&devfreq->lock);
 		devfreq_set_freq_table(devfreq);
+		mutex_lock(&devfreq->lock);
+	}

>  	devfreq->trans_table =	devm_kzalloc(dev, sizeof(unsigned int) *
>  						devfreq->profile->max_state *
>  						devfreq->profile->max_state,
[]

If that's not a problem, I'll squash
https://git.kernel.org/cgit/linux/kernel/git/mzx/devfreq.git/commit/?h=for-rafael&id=55df2b43cdb5ac82d26b64d739f3d758c9b7486c
with the given patch.