linux-kernel - Re: [PATCH] hwmon: (dell-smm) Fix warning on /proc/i8k creation error

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Date:   Fri, 12 Nov 2021 18:49:27 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Armin Wolf <W_Armin@....de>
Cc:     jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (dell-smm) Fix warning on /proc/i8k creation error

On Friday 12 November 2021 18:14:40 Armin Wolf wrote:
> The removal function is called regardless of whether
> /proc/i8k was created successfully or not, the later
> causing a WARN() on module removal.
> Fix that by only registering the removal function
> if /proc/i8k was created successfully.
> 
> Tested on a Inspiron 3505.
> 
> Fixes: 039ae58503f3 ("hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k")
> Signed-off-by: Armin Wolf <W_Armin@....de>

Acked-by: Pali Rohár <pali@...nel.org>

> ---
>  drivers/hwmon/dell-smm-hwmon.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index eaace478f508..5596c211f38d 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -627,10 +627,9 @@ static void __init i8k_init_procfs(struct device *dev)
>  {
>  	struct dell_smm_data *data = dev_get_drvdata(dev);
> 
> -	/* Register the proc entry */
> -	proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data);
> -
> -	devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
> +	/* Only register exit function if creation was successful */
> +	if (proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data))
> +		devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
>  }
> 
>  #else
> --
> 2.30.2
>