linux-kernel - Re: [PATCH v3 04/11] 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: <c709e0f33da06db40127f3a0adcbebbd@trvn.ru>
Date:   Thu, 14 Dec 2023 10:42:01 +0500
From:   Nikita Travkin <nikita@...n.ru>
To:     George Stark <gnstark@...utedevices.com>
Cc:     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, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kernel@...utedevices.com
Subject: Re: [PATCH v3 04/11] leds: aw2013: use devm API to cleanup module's
 resources

George Stark писал(а) 14.12.2023 03:30:
> 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>

Thanks for noticing and fixing this!
Perhaps this patch needs a Fixes tag too, like 1/11?

Tested-by: Nikita Travkin <nikita@...n.ru>

Btw, seems like (5..11)/11 never arrived to the lists...

Nikita

> ---
>  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);