[PATCH 2/2] power: supply: max17042_battery: Prevent int underflow in set_soc_threshold

From: Sebastian Krzyszkowiak
Date: Sun Sep 12 2021 - 16:54:38 EST


Fixes: e5f3872d2044 ("max17042: Add support for signalling change in SOC")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@xxxxxxx>
---
drivers/power/supply/max17042_battery.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
index c53980c8432a..caf83b4d622f 100644
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -857,7 +857,8 @@ static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
regmap_read(map, MAX17042_RepSOC, &soc);
soc >>= 8;
soc_tr = (soc + off) << 8;
- soc_tr |= (soc - off);
+ if (off < soc)
+ soc_tr |= soc - off;
regmap_write(map, MAX17042_SALRT_Th, soc_tr);
}

--
2.33.0