linux-kernel - Re: [PATCH] PM / devfreq: unlock mutex and free devfreq struct in error path

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Date:   Mon, 15 Mar 2021 16:20:05 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Cc:     myungjoo.ham@...sung.com, kyungmin.park@...sung.com
Subject: Re: [PATCH] PM / devfreq: unlock mutex and free devfreq struct in
 error path

Hi Lukasz,

On 3/13/21 3:45 AM, Lukasz Luba wrote:
> The devfreq->lock is held for time of setup. Release the lock in the
> error path, before jumping to the end of the function.
> 
> Change the goto destination which frees the allocated memory.
> 
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>  drivers/devfreq/devfreq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index b6d3e7db0b09..99b2eeedc238 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -822,7 +822,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
>  
>  	if (devfreq->profile->timer < 0
>  		|| devfreq->profile->timer >= DEVFREQ_TIMER_NUM) {
> -		goto err_out;
> +		mutex_unlock(&devfreq->lock);
> +		goto err_dev;
>  	}
>  
>  	if (!devfreq->profile->max_state && !devfreq->profile->freq_table) {
> 

Looks good to me. But, need to add the following information
and please use capital letter of the first character of patch title. Thanks.

Fixes: 4dc3bab8687f ("PM / devfreq: Add support delayed timer for polling mode")

Also, need to send it to stable lkml.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics