linux-kernel - Re: [PATCH 02/12] drm/tegra: rgb: add missing of_node_put after of_device_is

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Date:   Mon, 1 Apr 2019 18:19:12 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Julia Lawall <Julia.Lawall@...6.fr>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/12] drm/tegra: rgb: add missing of_node_put after
 of_device_is_available


On 2/23/2019 6:50 PM, Julia Lawall wrote:
> Add an of_node_put when a tested device node is not available.
>
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
>
> // <smpl>
> @@
> identifier f;
> local idexpression e;
> expression x;
> @@
>
> e = f(...);
> ... when != of_node_put(e)
>      when != x = e
>      when != e = x
>      when any
> if (<+...of_device_is_available(e)...+>) {
>    ... when != of_node_put(e)
> (
>    return e;
> |
> + of_node_put(e);
>    return ...;
> )
> }
> // </smpl>
>
> Fixes: d8f4a9eda0067 ("drm: Add NVIDIA Tegra20 support")
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

Cheers,
-Mukesh
>
> ---
>   drivers/gpu/drm/tegra/rgb.c |    4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff -u -p a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c
> --- a/drivers/gpu/drm/tegra/rgb.c
> +++ b/drivers/gpu/drm/tegra/rgb.c
> @@ -221,8 +221,10 @@ int tegra_dc_rgb_probe(struct tegra_dc *
>   	int err;
>   
>   	np = of_get_child_by_name(dc->dev->of_node, "rgb");
> -	if (!np || !of_device_is_available(np))
> +	if (!np || !of_device_is_available(np)) {
> +		of_node_put(np);
>   		return -ENODEV;
> +	}
>   
>   	rgb = devm_kzalloc(dc->dev, sizeof(*rgb), GFP_KERNEL);
>   	if (!rgb)
>