linux-kernel - Re: [PATCH 1/6] drm/bridge: aux-hpd: fix OF node leaks

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Date: Fri, 23 Feb 2024 11:56:29 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Johan Hovold <johan+linaro@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Vinod Koul <vkoul@...nel.org>
Cc: Jonas Karlman <jonas@...boo.se>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Kishon Vijay Abraham I <kishon@...nel.org>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Kuogee Hsieh <quic_khsieh@...cinc.com>, freedreno@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org
Subject: Re: [PATCH 1/6] drm/bridge: aux-hpd: fix OF node leaks

On 17/02/2024 16:02, Johan Hovold wrote:
> The two device node references taken during allocation need to be
> dropped when the auxiliary device is freed.
> 
> Fixes: 6914968a0b52 ("drm/bridge: properly refcount DT nodes in aux bridge drivers")
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>   drivers/gpu/drm/bridge/aux-hpd-bridge.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-bridge.c
> index bb55f697a181..9e71daf95bde 100644
> --- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c
> +++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c
> @@ -25,6 +25,7 @@ static void drm_aux_hpd_bridge_release(struct device *dev)
>   	ida_free(&drm_aux_hpd_bridge_ida, adev->id);
>   
>   	of_node_put(adev->dev.platform_data);
> +	of_node_put(adev->dev.of_node);
>   
>   	kfree(adev);
>   }
> @@ -74,6 +75,8 @@ struct device *drm_dp_hpd_bridge_register(struct device *parent,
>   
>   	ret = auxiliary_device_init(adev);
>   	if (ret) {
> +		of_node_put(adev->dev.platform_data);
> +		of_node_put(adev->dev.of_node);
>   		ida_free(&drm_aux_hpd_bridge_ida, adev->id);
>   		kfree(adev);
>   		return ERR_PTR(ret);

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>