linux-kernel - Re: [PATCH 2/3] Input: twl6040-vibra: fix child-node lookup

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Message-ID: <e2d4212c-cb75-d98a-caa1-b1d7b2f165f2@ti.com>
Date:   Mon, 13 Nov 2017 16:10:52 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Johan Hovold <johan@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        "H . Nikolaus Schaller" <hns@...delico.com>
Subject: Re: [PATCH 2/3] Input: twl6040-vibra: fix child-node lookup



On 2017-11-11 17:43, Johan Hovold wrote:
> Fix child-node lookup during probe, which ended up searching the whole
> device tree depth-first starting at parent rather than just matching on
> its children.
> 
> Later sanity checks on node properties (which would likely be missing)
> should prevent this from causing much trouble however, especially as the
> original premature free of the parent node has already been fixed
> separately (but that "fix" was apparently never backported to stable).
> 
> Fixes: e7ec014a47e4 ("Input: twl6040-vibra - update for device tree support")
> Fixes: c52c545ead97 ("Input: twl6040-vibra - fix DT node memory management")
> Cc: stable <stable@...r.kernel.org>     # 3.6

Note that of_get_child_by_name() is not present in 3.6, this was the
reason the original implementation was using of_find_node_by_name()

> Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> Cc: H. Nikolaus Schaller <hns@...delico.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
>  drivers/input/misc/twl6040-vibra.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
> index 5690eb7ff954..15e0d352c4cc 100644
> --- a/drivers/input/misc/twl6040-vibra.c
> +++ b/drivers/input/misc/twl6040-vibra.c
> @@ -248,8 +248,7 @@ static int twl6040_vibra_probe(struct platform_device *pdev)
>  	int vddvibr_uV = 0;
>  	int error;
>  
> -	of_node_get(twl6040_core_dev->of_node);
> -	twl6040_core_node = of_find_node_by_name(twl6040_core_dev->of_node,
> +	twl6040_core_node = of_get_child_by_name(twl6040_core_dev->of_node,
>  						 "vibra");
>  	if (!twl6040_core_node) {
>  		dev_err(&pdev->dev, "parent of node is missing?\n");
> 

- Péter

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