linux-kernel - [PATCH v2 03/10] leds: aw2013: use devm API to cleanup module's resources

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231204180603.470421-4-gnstark@salutedevices.com>
Date:   Mon, 4 Dec 2023 21:05:56 +0300
From:   George Stark <gnstark@...utedevices.com>
To:     <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>, <andy.shevchenko@...il.com>,
        <jic23@...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 v2 03/10] leds: aw2013: 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().

Signed-off-by: George Stark <gnstark@...utedevices.com>
---
 drivers/leds/leds-aw2013.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/leds-aw2013.c b/drivers/leds/leds-aw2013.c
index c2bc0782c0cd..1a8acf303548 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 +319,13 @@ static int aw2013_probe_dt(struct aw2013 *chip)
 	return 0;
 }
 
+static void aw2013_chip_disable_action(void *data)
+{
+	struct aw2013 *chip = (struct aw2013 *)data;
+
+	aw2013_chip_disable(chip);
+}
+
 static const struct regmap_config aw2013_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -334,7 +342,9 @@ static int aw2013_probe(struct i2c_client *client)
 	if (!chip)
 		return -ENOMEM;
 
-	mutex_init(&chip->mutex);
+	if (devm_mutex_init(&client->dev, &chip->mutex))
+		return -ENOMEM;
+
 	mutex_lock(&chip->mutex);
 
 	chip->client = client;
@@ -378,6 +388,10 @@ 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 +412,9 @@ 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 +428,6 @@ 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);
-- 
2.38.4