linux-kernel - Re: [PATCH 3/3] backlight: 88pm860x_bl: Use of_get_child_by

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Date:	Sun, 18 Jan 2015 12:46:04 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jingoo Han <jg1.han@...sung.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 3/3] backlight: 88pm860x_bl: Use of_get_child_by_name()
 instead of refcount hack

On Wed, 14 Jan 2015, Geert Uytterhoeven wrote:

> of_find_node_by_name() calls of_node_put() on its "from" parameter.
> To counter this, pm860x_backlight_dt_init() calls of_node_get() first.
> 
> Use of_get_child_by_name() instead to get rid of the refcount hack.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Cc: linux-fbdev@...r.kernel.org
> ---
> Compile-tested only
> ---
>  drivers/video/backlight/88pm860x_bl.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)

Looks good, applied, thanks.

> diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
> index 9a23698b6fe8398c..2da5862876d1fe78 100644
> --- a/drivers/video/backlight/88pm860x_bl.c
> +++ b/drivers/video/backlight/88pm860x_bl.c
> @@ -168,10 +168,7 @@ static int pm860x_backlight_dt_init(struct platform_device *pdev,
>  	struct device_node *nproot, *np;
>  	int iset = 0;
>  
> -	nproot = of_node_get(pdev->dev.parent->of_node);
> -	if (!nproot)
> -		return -ENODEV;
> -	nproot = of_find_node_by_name(nproot, "backlights");
> +	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "backlights");
>  	if (!nproot) {
>  		dev_err(&pdev->dev, "failed to find backlights node\n");
>  		return -ENODEV;

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