diff options
| author | Andreas Kemnade <andreas@kemnade.info> | 2018-09-17 07:20:35 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-20 18:00:14 +0100 |
| commit | b1fdcfbdb93cc899d19091a2385edb40a07420e3 (patch) | |
| tree | cef0c510df37832161aca47e954323e68a33e41f /drivers/power | |
| parent | dcd758c0346d1f03fca83ac4f5b8b1f589a3cda1 (diff) | |
power: supply: twl4030_charger: fix charging current out-of-bounds
[ 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>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/supply/twl4030_charger.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c index 0cc12bfe7b02..d3cba954bab5 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) { |