Re: [PATCH v4] lenovo-wmi-hotkey: Fixed a kernel bug failed with error -5

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Wed, 9 Jul 2025, Jackie Dong wrote:

> 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
> 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@139.com>
> Suggested-by: Hans de Goede <hansg@kernel.org>

Thanks. I applied this to the review-ilpo-fixes branch after doing major 
rephrasing to the changelog.

-- 
 i.

> ---
> Changes in v4:
>  - Simplify the logic code as (!obj || obj->type != ACPI_TYPE_INTEGER).
>  - Drop "now" of the warning messages.
> 
> Changes in v3:
>  - Reverse orignal logic  (obj && obj->type == ACPI_TYPE_INTEGER)
>    and add new decision for (led_version == 0).
>  - Optimize the descriptions based on reviewer comments.
> 
> 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..7b9bad1978ff 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)
> -		led_version = obj->integer.value;
> -	else
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)
>  		return -EIO;
>  
> -	wpriv->cdev[led_type].max_brightness = LED_ON;
> -	wpriv->cdev[led_type].flags = LED_CORE_SUSPENDRESUME;
> +	led_version = obj->integer.value;
> +
> +	/*
> +	 * Output parameters define: 0 means mute LED is not supported, Non-zero means
> +	 * mute LED can be supported.
> +	 */
> +	if (led_version == 0)
> +		return 0;
> +
>  
>  	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("The MIC_MUTE LED of this device isn't supported.\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("The AUDIO_MUTE LED of this device isn't supported.\n");
> +			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);
>