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

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Message-ID: <d492e274-fc01-98eb-4f99-a6af611d4c30@ideasonboard.com>
Date:   Mon, 14 Jan 2019 22:01:24 +0000
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Julia Lawall <julia.lawall@...6.fr>
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: Re: [PATCH 1/3 v2] drm: rcar-du: add missing of_node_put

Hi Julia,

On 14/01/2019 16:44, Julia Lawall wrote:
> 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>

Thankyou for the update.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>


> 
> ---
> 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;
>  	}
>