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Subject[PATCH v2] drm/meson: fix possible object reference leak
Date
The call to of_graph_get_remote_port 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/meson/meson_dw_hdmi.c:725:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 722, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: Markus Elfring <Markus.Elfring@web.de>
---
v2->v1: convert a if statement into a ternary statement.

drivers/gpu/drm/meson/meson_dw_hdmi.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index 563953e..826b98b 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -720,15 +720,10 @@ static bool meson_hdmi_connector_is_available(struct device *dev)

/* If the endpoint node exists, consider it enabled */
remote = of_graph_get_remote_port(ep);
- if (remote) {
- of_node_put(ep);
- return true;
- }
-
of_node_put(ep);
of_node_put(remote);

- return false;
+ return remote ? true : false;
}

static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
--
2.9.5
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