[PATCH v2] drm/imx/dcss: Add missing of_node_put() in fail path

[Liang He]

In dcss_dev_create() and dcss_dev_destroy(), we should call of_node_put()
in fail path or before the dcss's destroy as of_graph_get_port_by_id() has
increased the refcount.
 
Fixes: 9021c317b770 ("drm/imx: Add initial support for DCSS on iMX8MQ")
Signed-off-by: Liang He <win...@126.com>
---
 changelog:

 v2: add of_node_put() in dcss_dev_destroy() advised by Laurentiu
 v1: only fix bug in dcss_dev_create().

 v1 link: https://lore.kernel.org/all/20220707023214.307451-1-win...@126.com/


 drivers/gpu/drm/imx/dcss/dcss-dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c 
b/drivers/gpu/drm/imx/dcss/dcss-dev.c
index c849533ca83e..3f5750cc2673 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-dev.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-dev.c
@@ -207,6 +207,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool 
hdmi_output)
 
        ret = dcss_submodules_init(dcss);
        if (ret) {
+               of_node_put(dcss->of_port);
                dev_err(dev, "submodules initialization failed\n");
                goto clks_err;
        }
@@ -237,6 +238,8 @@ void dcss_dev_destroy(struct dcss_dev *dcss)
                dcss_clocks_disable(dcss);
        }
 
+       of_node_put(dcss->of_port);
+
        pm_runtime_disable(dcss->dev);
 
        dcss_submodules_stop(dcss);
-- 
2.25.1