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Date:   Thu, 14 Dec 2023 10:42:01 +0500
From:   Nikita Travkin <nikita@trvn.ru>
To:     George Stark <gnstark@salutedevices.com>
Cc:     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, linux-leds@vger.kernel.org,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        kernel@salutedevices.com
Subject: Re: [PATCH v3 04/11] leds: aw2013: use devm API to cleanup module's
 resources
In-Reply-To: <20231213223020.2713164-5-gnstark@salutedevices.com>
References: <20231213223020.2713164-1-gnstark@salutedevices.com>
 <20231213223020.2713164-5-gnstark@salutedevices.com>
Message-ID: <c709e0f33da06db40127f3a0adcbebbd@trvn.ru>
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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@salutedevices.com>

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

Tested-by: Nikita Travkin <nikita@trvn.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);