linux-kernel - [PATCH v6 4/9] leds: lp3952: use devm API to cleanup module's resources

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Date: Thu, 14 Mar 2024 11:45:26 +0300
From: George Stark <gnstark@...utedevices.com>
To: <andy.shevchenko@...il.com>, <pavel@....cz>, <lee@...nel.org>,
	<vadimp@...dia.com>, <mpe@...erman.id.au>, <npiggin@...il.com>,
	<christophe.leroy@...roup.eu>, <hdegoede@...hat.com>,
	<mazziesaccount@...il.com>, <peterz@...radead.org>, <mingo@...hat.com>,
	<will@...nel.org>, <longman@...hat.com>, <boqun.feng@...il.com>,
	<nikitos.tr@...il.com>, <marek.behun@....cz>, <kabel@...nel.org>
CC: <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <kernel@...utedevices.com>, George Stark
	<gnstark@...utedevices.com>
Subject: [PATCH v6 4/9] leds: lp3952: use devm API to cleanup module's resources

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().
Also drop explicit turning LEDs off from remove() due to they will be off
anyway by led_classdev_unregister().

Signed-off-by: George Stark <gnstark@...utedevices.com>
---
 drivers/leds/leds-lp3952.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/leds/leds-lp3952.c b/drivers/leds/leds-lp3952.c
index 5d18bbfd1f23..e24bfe686312 100644
--- a/drivers/leds/leds-lp3952.c
+++ b/drivers/leds/leds-lp3952.c
@@ -207,6 +207,13 @@ static const struct regmap_config lp3952_regmap = {
 	.cache_type = REGCACHE_MAPLE,
 };
 
+static void gpio_set_low_action(void *data)
+{
+	struct lp3952_led_array *priv = (struct lp3952_led_array *)data;
+
+	gpiod_set_value(priv->enable_gpio, 0);
+}
+
 static int lp3952_probe(struct i2c_client *client)
 {
 	int status;
@@ -226,6 +233,10 @@ static int lp3952_probe(struct i2c_client *client)
 		return status;
 	}
 
+	status = devm_add_action(&client->dev, gpio_set_low_action, priv);
+	if (status)
+		return status;
+
 	priv->regmap = devm_regmap_init_i2c(client, &lp3952_regmap);
 	if (IS_ERR(priv->regmap)) {
 		int err = PTR_ERR(priv->regmap);
@@ -254,15 +265,6 @@ static int lp3952_probe(struct i2c_client *client)
 	return 0;
 }
 
-static void lp3952_remove(struct i2c_client *client)
-{
-	struct lp3952_led_array *priv;
-
-	priv = i2c_get_clientdata(client);
-	lp3952_on_off(priv, LP3952_LED_ALL, false);
-	gpiod_set_value(priv->enable_gpio, 0);
-}
-
 static const struct i2c_device_id lp3952_id[] = {
 	{LP3952_NAME, 0},
 	{}
@@ -274,7 +276,6 @@ static struct i2c_driver lp3952_i2c_driver = {
 			.name = LP3952_NAME,
 	},
 	.probe = lp3952_probe,
-	.remove = lp3952_remove,
 	.id_table = lp3952_id,
 };
 
-- 
2.25.1