linux-kernel - [PATCH v7 8/8] leds: an30259a: use devm_mutex

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Message-ID: <20240314201856.1991899-9-gnstark@salutedevices.com>
Date: Thu, 14 Mar 2024 23:18:56 +0300
From: George Stark <gnstark@...utedevices.com>
To: <andy.shevchenko@...il.com>, <pavel@....cz>, <lee@...nel.org>,
	<vadimp@...dia.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>,
	<kernel@...utedevices.com>, George Stark <gnstark@...utedevices.com>
Subject: [PATCH v7 8/8] leds: an30259a: use devm_mutex_init() for mutex initialization

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 mutex which was destroyed already
in module's remove() so use devm API instead.

Signed-off-by: George Stark <gnstark@...utedevices.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/leds/leds-an30259a.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/leds/leds-an30259a.c b/drivers/leds/leds-an30259a.c
index 0216afed3b6e..decfca447d8a 100644
--- a/drivers/leds/leds-an30259a.c
+++ b/drivers/leds/leds-an30259a.c
@@ -283,7 +283,10 @@ static int an30259a_probe(struct i2c_client *client)
 	if (err < 0)
 		return err;
 
-	mutex_init(&chip->mutex);
+	err = devm_mutex_init(&client->dev, &chip->mutex);
+	if (err)
+		return err;
+
 	chip->client = client;
 	i2c_set_clientdata(client, chip);
 
@@ -317,17 +320,9 @@ static int an30259a_probe(struct i2c_client *client)
 	return 0;
 
 exit:
-	mutex_destroy(&chip->mutex);
 	return err;
 }
 
-static void an30259a_remove(struct i2c_client *client)
-{
-	struct an30259a *chip = i2c_get_clientdata(client);
-
-	mutex_destroy(&chip->mutex);
-}
-
 static const struct of_device_id an30259a_match_table[] = {
 	{ .compatible = "panasonic,an30259a", },
 	{ /* sentinel */ },
@@ -347,7 +342,6 @@ static struct i2c_driver an30259a_driver = {
 		.of_match_table = an30259a_match_table,
 	},
 	.probe = an30259a_probe,
-	.remove = an30259a_remove,
 	.id_table = an30259a_id,
 };
 
-- 
2.25.1