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From:   George Stark <gnstark@salutedevices.com>
To:     <andy.shevchenko@gmail.com>, <pavel@ucw.cz>, <lee@kernel.org>,
        <vadimp@nvidia.com>, <mpe@ellerman.id.au>, <npiggin@gmail.com>,
        <christophe.leroy@csgroup.eu>, <hdegoede@redhat.com>,
        <mazziesaccount@gmail.com>, <peterz@infradead.org>,
        <mingo@redhat.com>, <will@kernel.org>, <longman@redhat.com>,
        <boqun.feng@gmail.com>, <nikitos.tr@gmail.com>
CC:     <linux-leds@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linuxppc-dev@lists.ozlabs.org>, <kernel@salutedevices.com>,
        George Stark <gnstark@salutedevices.com>,
        Nikita Travkin <nikita@trvn.ru>
Subject: [PATCH v4 03/10] leds: aw2013: use devm API to cleanup module's resources
Date:   Thu, 14 Dec 2023 20:36:07 +0300
Message-ID: <20231214173614.2820929-4-gnstark@salutedevices.com>
In-Reply-To: <20231214173614.2820929-1-gnstark@salutedevices.com>
References: <20231214173614.2820929-1-gnstark@salutedevices.com>
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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@salutedevices.com>
Tested-by: Nikita Travkin <nikita@trvn.ru>
---
 drivers/leds/leds-aw2013.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/leds-aw2013.c b/drivers/leds/leds-aw2013.c
index c2bc0782c0cd..863aeb02f278 100644
--- a/drivers/leds/leds-aw2013.c
+++ b/drivers/leds/leds-aw2013.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 // Driver for Awinic AW2013 3-channel LED driver
 
+#include <linux/devm-helpers.h>
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/module.h>
@@ -318,6 +319,11 @@ 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,
@@ -334,7 +340,10 @@ 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;
@@ -378,6 +387,10 @@ 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;
@@ -398,19 +411,9 @@ 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 */ },
@@ -424,7 +427,6 @@ static struct i2c_driver aw2013_driver = {
 		.of_match_table = of_match_ptr(aw2013_match_table),
 	},
 	.probe = aw2013_probe,
-	.remove = aw2013_remove,
 };
 
 module_i2c_driver(aw2013_driver);
-- 
2.25.1