drm/meson: encoder_hdmi: Fix refcount leak in meson_encoder_hdmi_init

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>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220601033927.47814-3-linmq006@gmail.com

diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
index 2593c54..2f616c5 100644 (file)
--- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
@@ -371,7 +371,8 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
        meson_encoder_hdmi->next_bridge = of_drm_find_bridge(remote);
        if (!meson_encoder_hdmi->next_bridge) {
                dev_err(priv->dev, "Failed to find HDMI transceiver bridge\n");
-               return -EPROBE_DEFER;
+               ret = -EPROBE_DEFER;
+               goto err_put_node;
        }
 
        /* HDMI Encoder Bridge */
@@ -389,7 +390,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
                                      DRM_MODE_ENCODER_TMDS);
        if (ret) {
                dev_err(priv->dev, "Failed to init HDMI encoder: %d\n", ret);
-               return ret;
+               goto err_put_node;
        }
 
        meson_encoder_hdmi->encoder.possible_crtcs = BIT(0);
@@ -399,7 +400,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
                                DRM_BRIDGE_ATTACH_NO_CONNECTOR);
        if (ret) {
                dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
-               return ret;
+               goto err_put_node;
        }
 
        /* Initialize & attach Bridge Connector */
@@ -407,7 +408,8 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
                                                        &meson_encoder_hdmi->encoder);
        if (IS_ERR(meson_encoder_hdmi->connector)) {
                dev_err(priv->dev, "Unable to create HDMI bridge connector\n");
-               return PTR_ERR(meson_encoder_hdmi->connector);
+               ret = PTR_ERR(meson_encoder_hdmi->connector);
+               goto err_put_node;
        }
        drm_connector_attach_encoder(meson_encoder_hdmi->connector,
                                     &meson_encoder_hdmi->encoder);
@@ -434,6 +436,7 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
        meson_encoder_hdmi->connector->ycbcr_420_allowed = true;
 
        pdev = of_find_device_by_node(remote);
+       of_node_put(remote);
        if (pdev) {
                struct cec_connector_info conn_info;
                struct cec_notifier *notifier;
@@ -452,4 +455,8 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
        dev_dbg(priv->dev, "HDMI encoder initialized\n");
 
        return 0;
+
+err_put_node:
+       of_node_put(remote);
+       return ret;
 }