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

Peter Ujfalusi
2017-11-13T14:10:24Z

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@vger.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@ti.com>
> Cc: H. Nikolaus Schaller <hns@goldelico.com>
> Signed-off-by: Johan Hovold <johan@kernel.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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