From 725668c6b6aa3971fe850659102c250d0d676e18 Mon Sep 17 00:00:00 2001 From: Jianing Li Date: Wed, 1 Jul 2026 14:10:42 +0800 Subject: [PATCH] power: supply: max17040: handle missing status supplier MAX17040 does not report charger state itself, so the driver forwards POWER_SUPPLY_PROP_STATUS to a supplier power supply. If no supplier is registered, power_supply_get_property_from_supplier() returns -ENODEV and leaves the output value untouched. max17040_get_property() currently ignores that error and returns success, so userspace can read an uninitialized status value from the battery power supply. This happens on systems that use the fuel gauge without a charger supplier relationship in firmware. Return POWER_SUPPLY_STATUS_UNKNOWN when no supplier provides STATUS, and propagate other supplier lookup errors. Fixes: f4b782af61ae ("power: max17040: pass status property from supplier") Cc: stable@vger.kernel.org # 6.7+ Signed-off-by: Jianing Li Link: https://patch.msgid.link/20260701061042.1008-1-m13940358460@163.com Signed-off-by: Sebastian Reichel --- drivers/power/supply/max17040_battery.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c index e94d53b36aa4..03ac569e185c 100644 --- a/drivers/power/supply/max17040_battery.c +++ b/drivers/power/supply/max17040_battery.c @@ -405,7 +405,11 @@ static int max17040_get_property(struct power_supply *psy, val->intval = chip->low_soc_alert; break; case POWER_SUPPLY_PROP_STATUS: - power_supply_get_property_from_supplier(psy, psp, val); + ret = power_supply_get_property_from_supplier(psy, psp, val); + if (ret == -ENODEV) + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + else if (ret) + return ret; break; case POWER_SUPPLY_PROP_TEMP: if (!chip->channel_temp)