[PATCH 1/2] drm/meson: encoder_cvbs: Fix refcount leak in meson_encoder_cvbs_init

[PATCH 1/2] drm/meson: encoder_cvbs: Fix refcount leak in meson_encoder_cvbs_init

[Miaoqian Lin]

of_graph_get_remote_node() returns remote device nodepointer with
refcount incremented, we should use of_node_put() on it when done.
Add missing of_node_put() to avoid refcount leak.

Fixes: 318ba02cd8a8 ("drm/meson: encoder_cvbs: switch to bridge with ATTACH_NO_CONNECTOR")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/gpu/drm/meson/meson_encoder_cvbs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/meson/meson_encoder_cvbs.c b/drivers/gpu/drm/meson/meson_encoder_cvbs.c
index fd8db97ba8ba..8110a6e39320 100644
--- a/drivers/gpu/drm/meson/meson_encoder_cvbs.c
+++ b/drivers/gpu/drm/meson/meson_encoder_cvbs.c
@@ -238,6 +238,7 @@ int meson_encoder_cvbs_init(struct meson_drm *priv)
 	}
 
 	meson_encoder_cvbs->next_bridge = of_drm_find_bridge(remote);
+	of_node_put(remote);
 	if (!meson_encoder_cvbs->next_bridge) {
 		dev_err(priv->dev, "Failed to find CVBS Connector bridge\n");
 		return -EPROBE_DEFER;
-- 
2.25.1


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[PATCH 2/2] drm/meson: encoder_hdmi: Fix refcount leak in meson_encoder_hdmi_init

[Miaoqian Lin]

of_graph_get_remote_node() returns remote device nodepointer with
refcount incremented, we should use of_node_put() on it when done.
Add missing of_node_put() to avoid refcount leak.

Fixes: e67f6037ae1b ("drm/meson: split out encoder from meson_dw_hdmi")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
---
 drivers/gpu/drm/meson/meson_encoder_hdmi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
index 5e306de6f485..f3341458f8b7 100644
--- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
@@ -363,6 +363,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
 	}
 
 	meson_encoder_hdmi->next_bridge = of_drm_find_bridge(remote);
+	of_node_put(remote);
 	if (!meson_encoder_hdmi->next_bridge) {
 		dev_err(priv->dev, "Failed to find HDMI transceiver bridge\n");
 		return -EPROBE_DEFER;
-- 
2.25.1


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Re: [PATCH 2/2] drm/meson: encoder_hdmi: Fix refcount leak in meson_encoder_hdmi_init

[Martin Blumenstingl]

Hello,

first of all: thank you for spotting this and sending a patch!

On Tue, May 31, 2022 at 4:49 PM Miaoqian Lin <linmq006@gmail.com> wrote:
[...]
> diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
> index 5e306de6f485..f3341458f8b7 100644
> --- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
> @@ -363,6 +363,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
>         }
>
>         meson_encoder_hdmi->next_bridge = of_drm_find_bridge(remote);
> +       of_node_put(remote);
further down in the same function remote is used again:
  pdev = of_find_device_by_node(remote);

My understanding is that we should only use of_node_put() once we
don't need to access the node (in this case the variable is "remote")
anymore.


Best regards,
Martin

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Re: [PATCH 1/2] drm/meson: encoder_cvbs: Fix refcount leak in meson_encoder_cvbs_init

[Martin Blumenstingl]

On Tue, May 31, 2022 at 4:49 PM Miaoqian Lin <linmq006@gmail.com> wrote:
>
> of_graph_get_remote_node() returns remote device nodepointer with
> refcount incremented, we should use of_node_put() on it when done.
> Add missing of_node_put() to avoid refcount leak.
>
> Fixes: 318ba02cd8a8 ("drm/meson: encoder_cvbs: switch to bridge with ATTACH_NO_CONNECTOR")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

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