From: Andreas Kemnade andreas@kemnade.info
[ Upstream commit 8314c212f995bc0d06b54ad02ef0ab4089781540 ]
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 andreas@kemnade.info Signed-off-by: Sebastian Reichel sebastian.reichel@collabora.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 b6a7d9f74cf30..adcaa0a10a6f4 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) {