linux-kernel - Re: [PATCH v2] PM / devfreq: Unlock mutex and free devfreq struct in error path

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Date:   Mon, 15 Mar 2021 18:54:52 +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,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] PM / devfreq: Unlock mutex and free devfreq struct
 in error path

On 3/15/21 6:31 PM, 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.
> 
> Cc: v5.9+ <stable@...r.kernel.org> # v5.9+
> Fixes: 4dc3bab8687f ("PM / devfreq: Add support delayed timer for polling mode")
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
> v2:
> - added fixes tag and CC stable v5.9+
> - used capital letter in commit header
> 
> 
>  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) {
> 


Applied it. Thanks.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics