[PATCH v3] iio: adc: mt6359: fix unchecked return value in mt6358_read_imp

[Andy Shevchenko]

On Mon, Apr 27, 2026 at 08:08:49PM +0100, Salah Triki wrote:
> In mt6358_read_imp(), the variable val_v is passed to regmap_read()
> but the return value is not checked. If the read fails, val_v remains
> uninitialized and its random stack content is subsequently reported
> as a measurement result.
> 
> Initialize val_v to zero to ensure a predictable value is reported
> in case of bus failure and to prevent potential stack data leakage.
> This also satisfies static analyzers that might otherwise flag the
> variable as used uninitialized.

...

>  	const struct mtk_pmic_auxadc_info *cinfo = adc_dev->chip_info;
>  	struct regmap *regmap = adc_dev->regmap;
>  	u16 reg_adc0 = cinfo->regs[PMIC_AUXADC_ADC0];
> -	u32 val_v;
> +	u32 val_v = 0;

This is hard to maintain. Better to assign it just immediately before the first use.

>  	int ret;

Otherwise, LGTM.

-- 
With Best Regards,
Andy Shevchenko