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SubjectRe: [PATCH] hwmon: (ina3221) Clamp shunt resistor value from DT
On Mon, Oct 08, 2018 at 01:05:37PM -0700, Nicolin Chen wrote:
> The input->shunt_resistor is int type while the value from DT is
> unsigned int. Meanwhile, a divide-by-zero error would happen if
> the value is 0. So this patch just simply clamps the value.
>

I think it would be better to validate the numbers here instead of
silently accepting bad values, and return -EINVAL if the property value
is bad.

Thanks,
Guenter

> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
> ---
> drivers/hwmon/ina3221.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
> index c3a497aed345..ce8f0a8c4982 100644
> --- a/drivers/hwmon/ina3221.c
> +++ b/drivers/hwmon/ina3221.c
> @@ -536,8 +536,10 @@ static int ina3221_probe_child_from_dt(struct device *dev,
> of_property_read_string(child, "label", &input->label);
>
> /* Overwrite default shunt resistor value optionally */
> - if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val))
> + if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) {
> + val = clamp_val(val, 1, INT_MAX);
> input->shunt_resistor = val;
> + }
>
> return 0;
> }
> --
> 2.17.1
>

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