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power: supply: twl4030_charger: fix charging current out-of-bounds

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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>
This commit is contained in:
Andreas Kemnade 2018-09-17 07:20:35 +02:00 committed by Sebastian Reichel
parent ad1570d99f
commit 8314c212f9
1 changed files with 2 additions and 1 deletions
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3
drivers/power/supply/twl4030_charger.c
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@ -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) {