linux-kernel - [PATCH 1/3 v2] drm: rcar-du: add missing of_node

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Date:   Mon, 14 Jan 2019 17:44:56 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3 v2] drm: rcar-du: add missing of_node_put

Add an of_node_put when the result of of_graph_get_remote_port_parent is
not available.

Add a second of_node_put if no encoder is selected (encoder remains NULL).

The semantic match that finds the first problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@r exists@
local idexpression e;
expression x;
@@
e = of_graph_get_remote_port_parent(...);
... when != x = e
    when != true e == NULL
    when != of_node_put(e)
    when != of_fwnode_handle(e)
(
return e;
|
*return ...;
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
v2: Add the second of_node_put(entity);, as suggested by Kieran Bingham.

 drivers/gpu/drm/rcar-du/rcar_du_kms.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 9c7007d..f9a90ff 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -331,6 +331,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 		dev_dbg(rcdu->dev,
 			"connected entity %pOF is disabled, skipping\n",
 			entity);
+		of_node_put(entity);
 		return -ENODEV;
 	}

@@ -366,6 +367,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu,
 		dev_warn(rcdu->dev,
 			 "no encoder found for endpoint %pOF, skipping\n",
 			 ep->local_node);
+		of_node_put(entity);
 		return -ENODEV;
 	}