linux-kernel - Re: [PATCH 1/5] backlight: 88pm860x_bl: add missing of_node

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Message-ID: <20151013081535.GB17172@x1>
Date:	Tue, 13 Oct 2015 09:15:35 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Jingoo Han <jingoohan1@...il.com>, kernel-janitors@...r.kernel.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH 1/5] backlight: 88pm860x_bl: add missing of_node_put

On Sat, 10 Oct 2015, Julia Lawall wrote:

> for_each_child_of_node performs an of_node_get on each iteration, so
> a break out of the loop requires an of_node_put.
> 
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> expression root,e;
> local idexpression child;
> iterator name for_each_child_of_node;
> @@
> 
>  for_each_child_of_node(root, child) {
>    ... when != of_node_put(child)
>        when != e = child
> +  of_node_put(child);
> ?  break;
>    ...
> }
> ... when != child
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>  drivers/video/backlight/88pm860x_bl.c |    1 +
>  1 file changed, 1 insertion(+)

Applied, thanks.

> diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> index 2da5862..6d8dc2c 100644
> --- a/drivers/video/backlight/88pm860x_bl.c
> +++ b/drivers/video/backlight/88pm860x_bl.c
> @@ -180,6 +180,7 @@ static int pm860x_backlight_dt_init(struct platform_device *pdev,
>  			data->iset = PM8606_WLED_CURRENT(iset);
>  			of_property_read_u32(np, "marvell,88pm860x-pwm",
>  					     &data->pwm);
> +			of_node_put(np);
>  			break;
>  		}
>  	}
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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