linux-kernel - Re: [PATCH v2] drm/msm/devfreq: Fix OPP refcnt leak

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Date:   Sat, 6 Nov 2021 03:04:15 +0530
From:   Akhil P Oommen <akhilpo@...eaurora.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        David Airlie <airlied@...ux.ie>, linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Steev Klimaszewski <steev@...i.org>,
        open list <linux-kernel@...r.kernel.org>,
        Sean Paul <sean@...rly.run>, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v2] drm/msm/devfreq: Fix OPP refcnt leak

On 11/6/2021 1:50 AM, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Reported-by: Douglas Anderson <dianders@...omium.org>
> Fixes: 9bc95570175a ("drm/msm: Devfreq tuning")
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>   drivers/gpu/drm/msm/msm_gpu_devfreq.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
> index d32b729b4616..07f1169df89b 100644
> --- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
> +++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
> @@ -20,6 +20,10 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>   	struct msm_gpu *gpu = dev_to_gpu(dev);
>   	struct dev_pm_opp *opp;
>   
> +	/*
> +	 * Note that devfreq_recommended_opp() can modify the freq
> +	 * to something that actually is in the opp table:
> +	 */
>   	opp = devfreq_recommended_opp(dev, freq, flags);
>   
>   	/*
> @@ -28,6 +32,7 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>   	 */
>   	if (gpu->devfreq.idle_freq) {
>   		gpu->devfreq.idle_freq = *freq;
> +		dev_pm_opp_put(opp);
>   		return 0;
>   	}
>   
> 

Reviewed-by: Akhil P Oommen <akhilpo@...eaurora.org>

-Akhil