Re: [PATCH RESEND] twl4030_charger: fix charging current out-of-bounds

[Sebastian Reichel]

Hi,

On Mon, Sep 17, 2018 at 07:20:35AM +0200, Andreas Kemnade wrote:
> the charging current uses unsigned int variables, if we step back
> if the current is still low, we would run into negative which
> means setting the target to a huge value.
> Better add checks here.
> 
> Signed-off-by: Andreas Kemnade <andr...@kemnade.info>
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/supply/twl4030_charger.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c 
> b/drivers/power/supply/twl4030_charger.c
> index b72838663872..c954b7234393 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -421,7 +421,8 @@ static void twl4030_current_worker(struct work_struct 
> *data)
>  
>       if (v < USB_MIN_VOLT) {
>               /* Back up and stop adjusting. */
> -             bci->usb_cur -= USB_CUR_STEP;
> +             if (bci->usb_cur >= USB_CUR_STEP)
> +                     bci->usb_cur -= USB_CUR_STEP;
>               bci->usb_cur_target = bci->usb_cur;
>       } else if (bci->usb_cur >= bci->usb_cur_target ||
>                  bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
> -- 
> 2.11.0
> 

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