linux-kernel - Re: [PATCH v2] lenovo-wmi-hotkey: Fixed a kernel error report for

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Message-ID: <78394a09-6ca2-afc4-3b35-de4ea8e998cd@linux.intel.com>
Date: Tue, 8 Jul 2025 11:07:31 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Jackie Dong <xy-jackie@....com>
cc: hansg@...nel.org, platform-driver-x86@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>, dongeg1@...ovo.com
Subject: Re: [PATCH v2] lenovo-wmi-hotkey: Fixed a kernel error report for

On Tue, 8 Jul 2025, Jackie Dong wrote:

Hi,

Shortlog in Subject seems incomplete

> Not all of Lenovo non-ThinkPad devices support both mic mute LED(on F4)
> and audio mute LED(on F1). Some of them only support one mute LED, some

Add spaces after (

> of them don't have any mute LED. Add a decision to judge this device
> support mute LED or not. Without this decision, not support both of mic
> mute LED and audio mute LED Lenovo non-ThinkPad brand devices (including
> Ideapad/Yoga/Xiaoxin/Gaming/ThinkBook, etc.) will report a failed message
> with error -5.
> 
> Signed-off-by: Jackie Dong <xy-jackie@....com>
> Suggested-by: Hans de Goede <hansg@...nel.org>
> 
> ---
> Changes in v2:
>  - Add warning message and then return 0 if the device support mute LED 
>    abnormaly, based on Hans suggestion and Armin previous patch. 
> 
>  .../x86/lenovo-wmi-hotkey-utilities.c         | 30 +++++++++++++------
>  1 file changed, 21 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/platform/x86/lenovo-wmi-hotkey-utilities.c b/drivers/platform/x86/lenovo-wmi-hotkey-utilities.c
> index 89153afd7015..334c12f2896d 100644
> --- a/drivers/platform/x86/lenovo-wmi-hotkey-utilities.c
> +++ b/drivers/platform/x86/lenovo-wmi-hotkey-utilities.c
> @@ -122,26 +122,35 @@ static int lenovo_super_hotkey_wmi_led_init(enum mute_led_type led_type, struct
>  		return -EIO;
>  
>  	union acpi_object *obj __free(kfree) = output.pointer;
> -	if (obj && obj->type == ACPI_TYPE_INTEGER)
> +	if (obj && obj->type == ACPI_TYPE_INTEGER) {

Could you please reverse this logic and handle errors first.

>  		led_version = obj->integer.value;
> -	else
> -		return -EIO;
>  
> -	wpriv->cdev[led_type].max_brightness = LED_ON;
> -	wpriv->cdev[led_type].flags = LED_CORE_SUSPENDRESUME;
> +		/*
> +		 * Output parameters define: 0 means mute LED is not supported, Non-zero means
> +		 * mute LED can be supported.
> +		 */
> +		if (led_version == 0)
> +			return 0;
> +	} else {
> +		return -EIO;
> +	}
>  
>  	switch (led_type) {
>  	case MIC_MUTE:
> -		if (led_version != WMI_LUD_SUPPORT_MICMUTE_LED_VER)
> -			return -EIO;
> +		if (led_version != WMI_LUD_SUPPORT_MICMUTE_LED_VER) {
> +			pr_warn("This device MIC_MUTE LED doesn't support now.\n");
> +			return 0;
> +		}
>  
>  		wpriv->cdev[led_type].name = "platform::micmute";
>  		wpriv->cdev[led_type].brightness_set_blocking = &lsh_wmi_micmute_led_set;
>  		wpriv->cdev[led_type].default_trigger = "audio-micmute";
>  		break;
>  	case AUDIO_MUTE:
> -		if (led_version != WMI_LUD_SUPPORT_AUDIOMUTE_LED_VER)
> -			return -EIO;
> +		if (led_version != WMI_LUD_SUPPORT_AUDIOMUTE_LED_VER) {
> +			pr_warn("This device AUDIO_MUTE LED doesn't support now.\n");

Both of these warnings have the same grammar flaws and need to be 
rephrased.

> +			return 0;
> +		}
>  
>  		wpriv->cdev[led_type].name = "platform::mute";
>  		wpriv->cdev[led_type].brightness_set_blocking = &lsh_wmi_audiomute_led_set;
> @@ -152,6 +161,9 @@ static int lenovo_super_hotkey_wmi_led_init(enum mute_led_type led_type, struct
>  		return -EINVAL;
>  	}
>  
> +	wpriv->cdev[led_type].max_brightness = LED_ON;
> +	wpriv->cdev[led_type].flags = LED_CORE_SUSPENDRESUME;
> +
>  	err = devm_led_classdev_register(dev, &wpriv->cdev[led_type]);
>  	if (err < 0) {
>  		dev_err(dev, "Could not register mute LED %d : %d\n", led_type, err);
> 

-- 
 i.