linux-kernel - Re: [PATCH 2/2] mfd: twl6040: fix child-node lookup

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Date:   Mon, 13 Nov 2017 22:14:02 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Johan Hovold <johan@...nel.org>, Tony Lindgren <tony@...mide.com>
CC:     Lee Jones <lee.jones@...aro.org>, <linux-omap@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, stable <stable@...r.kernel.org>,
        Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 2/2] mfd: twl6040: fix child-node lookup

On 11/11/2017 05:38 PM, 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 node was prematurely freed, while the
> child node was leaked.
> 
> Note that the CONFIG_OF compile guard can be removed as
> of_get_child_by_name() provides a !CONFIG_OF implementation which always
> fails.

Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>

> 
> Fixes: 37e13cecaa14 ("mfd: Add support for Device Tree to twl6040")
> Fixes: ca2cad6ae38e ("mfd: Fix twl6040 build failure")
> Cc: stable <stable@...r.kernel.org>     # 3.5
> Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> ---
>  drivers/mfd/twl6040.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
> index d66502d36ba0..dd19f17a1b63 100644
> --- a/drivers/mfd/twl6040.c
> +++ b/drivers/mfd/twl6040.c
> @@ -97,12 +97,16 @@ static struct reg_sequence twl6040_patch[] = {
>  };
>  
>  
> -static bool twl6040_has_vibra(struct device_node *node)
> +static bool twl6040_has_vibra(struct device_node *parent)
>  {
> -#ifdef CONFIG_OF
> -	if (of_find_node_by_name(node, "vibra"))
> +	struct device_node *node;
> +
> +	node = of_get_child_by_name(parent, "vibra");
> +	if (node) {
> +		of_node_put(node);
>  		return true;
> -#endif
> +	}
> +
>  	return false;
>  }
>  
> 


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