linux-kernel - Re: [PATCH 2/3] backlight: max8925

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Date:   Mon, 13 Nov 2017 13:57:05 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Johan Hovold <johan@...nel.org>, Lee Jones <lee.jones@...aro.org>
Cc:     Jingoo Han <jingoohan1@...il.com>, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable <stable@...r.kernel.org>, Qing Xu <qingx@...vell.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>
Subject: Re: [PATCH 2/3] backlight: max8925_bl: fix device-tree node lookup



On 13/11/17 10:20, Johan Hovold wrote:
> Fix child-node lookup during probe, which ended up searching the whole
> device tree depth-first starting at the parent rather than just matching
> on its children.
> 
> To make things worse, the parent mfd node was also prematurely freed,
> while the child backlight node was leaked.
> 
> Fixes: 47ec340cb8e2 ("mfd: max8925: Support dt for backlight")
> Cc: stable <stable@...r.kernel.org>     # 3.9
> Cc: Qing Xu <qingx@...vell.com>
> Cc: Haojian Zhuang <haojian.zhuang@...il.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Acked-by: Daniel Thompson <daniel.thompson@...aro.org>


> ---
>   drivers/video/backlight/max8925_bl.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
> index 7b738d60ecc2..f3aa6088f1d9 100644
> --- a/drivers/video/backlight/max8925_bl.c
> +++ b/drivers/video/backlight/max8925_bl.c
> @@ -116,7 +116,7 @@ static void max8925_backlight_dt_init(struct platform_device *pdev)
>   	if (!pdata)
>   		return;
>   
> -	np = of_find_node_by_name(nproot, "backlight");
> +	np = of_get_child_by_name(nproot, "backlight");
>   	if (!np) {
>   		dev_err(&pdev->dev, "failed to find backlight node\n");
>   		return;
> @@ -125,6 +125,8 @@ static void max8925_backlight_dt_init(struct platform_device *pdev)
>   	if (!of_property_read_u32(np, "maxim,max8925-dual-string", &val))
>   		pdata->dual_string = val;
>   
> +	of_node_put(np);
> +
>   	pdev->dev.platform_data = pdata;
>   }
>   
>