linux-kernel - Re: [PATCH v2 2/2] drm/panthor: Fix OPP refcnt leaks in devfreq initialisation

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Message-ID: <7e19cfaf-7c22-42d2-8d53-f654e61124c1@arm.com>
Date: Thu, 3 Oct 2024 15:50:58 +0100
From: Steven Price <steven.price@....com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Rob Herring <robh@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Liviu Dudau <liviu.dudau@....com>, Clément Péron
 <peron.clem@...il.com>, Heiko Stuebner <heiko@...ech.de>,
 Grant Likely <grant.likely@...aro.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/panthor: Fix OPP refcnt leaks in devfreq
 initialisation

On 03/10/2024 14:30, Adrián Larumbe wrote:
> Make sure in case of errors between the first fetch of an OPP in
> panthor_devfreq_init and its successive put, the error path decrements its
> reference count to avoid OPP object leaks when removing the device.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
> Fixes: fac9b22df4b1 ("drm/panthor: Add the devfreq logical block")

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/panthor/panthor_devfreq.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c b/drivers/gpu/drm/panthor/panthor_devfreq.c
> index 9d0f891b9b53..ce0ac4563f65 100644
> --- a/drivers/gpu/drm/panthor/panthor_devfreq.c
> +++ b/drivers/gpu/drm/panthor/panthor_devfreq.c
> @@ -197,7 +197,7 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
>  	if (ret && ret != -ENODEV) {
>  		if (ret != -EPROBE_DEFER)
>  			DRM_DEV_ERROR(dev, "Couldn't retrieve/enable sram supply\n");
> -		return ret;
> +		goto opp_err;
>  	}
>  
>  	/*
> @@ -207,7 +207,7 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
>  	ret = dev_pm_opp_set_opp(dev, opp);
>  	if (ret) {
>  		DRM_DEV_ERROR(dev, "Couldn't set recommended OPP\n");
> -		return ret;
> +		goto opp_err;
>  	}
>  
>  	dev_pm_opp_put(opp);
> @@ -242,6 +242,10 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
>  		DRM_DEV_INFO(dev, "Failed to register cooling device\n");
>  
>  	return 0;
> +
> +opp_err:
> +	dev_pm_opp_put(opp);
> +	return ret;
>  }
>  
>  int panthor_devfreq_resume(struct panthor_device *ptdev)