From 8314c212f995bc0d06b54ad02ef0ab4089781540 Mon Sep 17 00:00:00 2001 From: Andreas Kemnade Date: Mon, 17 Sep 2018 07:20:35 +0200 Subject: power: supply: twl4030_charger: fix charging current out-of-bounds 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 Signed-off-by: Sebastian Reichel --- drivers/power/supply/twl4030_charger.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/power') diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c index bbcaee56db9d..c629c1642531 100644 --- a/drivers/power/supply/twl4030_charger.c +++ b/drivers/power/supply/twl4030_charger.c @@ -420,7 +420,8 @@ 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) { -- cgit v1.2.3