[PATCH 3/5] power: supply: bq27xxx: Use devm to free device mutex

[Andrew Davis]

Use a device lifecycle managed action to free the device mutex.
This helps prevent mistakes like freeing out of order in cleanup
functions and forgetting to free on error paths.

Signed-off-by: Andrew Davis <afd@xxxxxx>
---
 drivers/power/supply/bq27xxx_battery.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 1c4a9d1377442..d3b6327b16b56 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -2101,6 +2101,13 @@ static void bq27xxx_external_power_changed(struct power_supply *psy)
 	mod_delayed_work(system_wq, &di->work, HZ / 2);
 }
 
+static void bq27xxx_battery_mutex_destroy(void *data)
+{
+	struct mutex *lock = data;
+
+	mutex_destroy(lock);
+}
+
 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
 {
 	struct power_supply_desc *psy_desc;
@@ -2108,9 +2115,14 @@ int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
 		.of_node = di->dev->of_node,
 		.drv_data = di,
 	};
+	int ret;
 
 	INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
 	mutex_init(&di->lock);
+	ret = devm_add_action_or_reset(di->dev, bq27xxx_battery_mutex_destroy,
+				       &di->lock);
+	if (ret)
+		return ret;
 
 	di->regs       = bq27xxx_chip_data[di->chip].regs;
 	di->unseal_key = bq27xxx_chip_data[di->chip].unseal_key;
@@ -2158,7 +2170,6 @@ void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
 	cancel_delayed_work_sync(&di->work);
 
 	power_supply_unregister(di->bat);
-	mutex_destroy(&di->lock);
 }
 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
 
-- 
2.39.2