[PATCH] drm:bridge:analogix: Fix refcount bugs in anx7625_parse_dt()

[Liang He]

There are two refcount bugs in this funcion:

BUG-1: 'pdata->mipi_host_node' will be assigned a new reference with
of_graph_get_remote_node() which will increase the refcount of the
object, correspondingly, we should call of_node_put() for the old
reference stored in the 'pdata->mipi_host_node'.

BUG-2: of_graph_get_endpoint_by_regs() will also increase the refcount
of the object and its new reference will be assigned to local 'ep0', so
there should be a of_node_put() when 'ep0' is not used anymore.

Fixes: 8bdfc5dae4e3 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
Fixes: fd0310b6fe7d ("drm/bridge: anx7625: add MIPI DPI input feature")
Signed-off-by: Liang He <windhl at 126.com>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 53a5da6c49dd..f39b9be19eaf 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1624,6 +1624,7 @@ static int anx7625_parse_dt(struct device *dev,
 	anx7625_get_swing_setting(dev, pdata);
 
 	pdata->is_dpi = 1; /* default dpi mode */
+	of_node_put(pdata->mipi_host_node);
 	pdata->mipi_host_node = of_graph_get_remote_node(np, 0, 0);
 	if (!pdata->mipi_host_node) {
 		DRM_DEV_ERROR(dev, "fail to get internal panel.\n");
@@ -1638,6 +1639,7 @@ static int anx7625_parse_dt(struct device *dev,
 			bus_type = 0;
 
 		mipi_lanes = of_property_count_u32_elems(ep0, "data-lanes");
+		of_node_put(ep0);
 	}
 
 	if (bus_type == V4L2_FWNODE_BUS_TYPE_PARALLEL) /* bus type is Parallel(DSI) */
-- 
2.25.1