[PATCH v6 2/9] leds: aw2013: use devm API to cleanup module's resources

[George Stark]

In this driver LEDs are registered using devm_led_classdev_register()
so they are automatically unregistered after module's remove() is done.
led_classdev_unregister() calls module's led_set_brightness() to turn off
the LEDs and that callback uses resources which were destroyed already
in module's remove() so use devm API instead of remove().

Signed-off-by: George Stark <gnstark@xxxxxxxxxxxxxxxxx>
Tested-by: Nikita Travkin <nikita@xxxxxxx>
---
 drivers/leds/leds-aw2013.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/leds-aw2013.c b/drivers/leds/leds-aw2013.c
index 17235a5e576a..6475eadcb0df 100644
--- a/drivers/leds/leds-aw2013.c
+++ b/drivers/leds/leds-aw2013.c
@@ -320,6 +320,11 @@ static int aw2013_probe_dt(struct aw2013 *chip)
 	return 0;
 }
 
+static void aw2013_chip_disable_action(void *data)
+{
+	aw2013_chip_disable(data);
+}
+
 static const struct regmap_config aw2013_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -336,7 +341,10 @@ static int aw2013_probe(struct i2c_client *client)
 	if (!chip)
 		return -ENOMEM;
 
-	mutex_init(&chip->mutex);
+	ret = devm_mutex_init(&client->dev, &chip->mutex);
+	if (ret)
+		return ret;
+
 	mutex_lock(&chip->mutex);
 
 	chip->client = client;
@@ -384,6 +392,10 @@ static int aw2013_probe(struct i2c_client *client)
 		goto error_reg;
 	}
 
+	ret = devm_add_action(&client->dev, aw2013_chip_disable_action, chip);
+	if (ret)
+		goto error_reg;
+
 	ret = aw2013_probe_dt(chip);
 	if (ret < 0)
 		goto error_reg;
@@ -406,19 +418,9 @@ static int aw2013_probe(struct i2c_client *client)
 
 error:
 	mutex_unlock(&chip->mutex);
-	mutex_destroy(&chip->mutex);
 	return ret;
 }
 
-static void aw2013_remove(struct i2c_client *client)
-{
-	struct aw2013 *chip = i2c_get_clientdata(client);
-
-	aw2013_chip_disable(chip);
-
-	mutex_destroy(&chip->mutex);
-}
-
 static const struct of_device_id aw2013_match_table[] = {
 	{ .compatible = "awinic,aw2013", },
 	{ /* sentinel */ },
@@ -432,7 +434,6 @@ static struct i2c_driver aw2013_driver = {
 		.of_match_table = aw2013_match_table,
 	},
 	.probe = aw2013_probe,
-	.remove = aw2013_remove,
 };
 
 module_i2c_driver(aw2013_driver);
-- 
2.25.1