[PATCH 6/7] drm: rcar-du: fix possible object reference leak

[Wen Yang]

The call to of_get_parent returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
drivers/gpu/drm/rcar-du/rcar_du_of.c:235:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 216, but without a corresponding object release within this function.
drivers/gpu/drm/rcar-du/rcar_du_of.c:236:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 209, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99 at zte.com.cn>
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Cc: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
Cc: David Airlie <airlied at linux.ie>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: dri-devel at lists.freedesktop.org
Cc: linux-renesas-soc at vger.kernel.org
Cc: linux-kernel at vger.kernel.org (open list)
---
 drivers/gpu/drm/rcar-du/rcar_du_of.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of.c b/drivers/gpu/drm/rcar-du/rcar_du_of.c
index afef696..30bceca 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_of.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of.c
@@ -232,6 +232,8 @@ static void __init rcar_du_of_lvds_patch(const struct of_device_id *of_ids)
 	lvds_node = of_find_compatible_node(NULL, NULL, compatible);
 	if (lvds_node) {
 		of_node_put(lvds_node);
+		of_node_put(soc_node);
+		of_node_put(du_node);
 		return;
 	}
 
-- 
2.9.5