Re: [PATCH] hwmon: (hp-wmi-sensors) Improve raw WMI string handling

[Guenter Roeck <linux@roeck-us.net>]

On Wed, Sep 16, 2026 at 03:19:15PM -0700, James Seo wrote:
> Commit c9ba59258094 ("hwmon: (hp-wmi-sensors) Fix failure to load on
> EliteDesk 800 G6") left out some logic for recognizing raw WMI
> strings in check_numeric_sensor_wobj(). This issue was reported by a
> user along with an incomplete and unsuitable proposed solution [1].
> 
> Add the missing logic and properly remedy the issue. Also slightly
> refactor how raw WMI strings are recognized elsewhere to make the
> intent that they should be treated as regular ACPI strings clearer.
> 
> Reported-by: Muhammad Bilal <meatuni001@gmail.com>
> Link: https://lore.kernel.org/linux-hwmon/20260916002907.161210-1-meatuni001@gmail.com/ [1]
> Fixes: c9ba59258094 ("hwmon: (hp-wmi-sensors) Fix failure to load on EliteDesk 800 G6")
> Signed-off-by: James Seo <james@equiv.tech>

Never mind my previous reply. Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/hp-wmi-sensors.c | 30 ++++++++++++++++++++++--------
>  1 file changed, 22 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/hwmon/hp-wmi-sensors.c b/drivers/hwmon/hp-wmi-sensors.c
> index 03c684ba83bd..cb2eb9bd278a 100644
> --- a/drivers/hwmon/hp-wmi-sensors.c
> +++ b/drivers/hwmon/hp-wmi-sensors.c
> @@ -526,14 +526,12 @@ static int check_wobj(const union acpi_object *wobj,
>  	for (prop = 0; prop <= last_prop; prop++) {
>  		type = elements[prop].type;
>  		valid_type = property_map[prop];
> -		if (type != valid_type) {
> -			if (type == ACPI_TYPE_BUFFER &&
> -			    valid_type == ACPI_TYPE_STRING &&
> -			    is_raw_wmi_string(elements[prop].buffer.pointer,
> -					      elements[prop].buffer.length))
> -				continue;
> +		if (type == ACPI_TYPE_BUFFER &&
> +		    is_raw_wmi_string(elements[prop].buffer.pointer,
> +				      elements[prop].buffer.length))
> +			type = ACPI_TYPE_STRING;
> +		if (type != valid_type)
>  			return -EINVAL;
> -		}
>  	}
>  
>  	return 0;
> @@ -579,6 +577,7 @@ static int check_numeric_sensor_wobj(const union acpi_object *wobj,
>  	int prop = HP_WMI_PROPERTY_NAME;
>  	acpi_object_type valid_type;
>  	union acpi_object *elements;
> +	union acpi_object *element;
>  	u32 elem_count;
>  	int last_prop;
>  	bool is_new;
> @@ -602,13 +601,20 @@ static int check_numeric_sensor_wobj(const union acpi_object *wobj,
>  	    elem_count > HP_WMI_MAX_PROPERTIES)
>  		return -EINVAL;
>  
> -	type = elements[HP_WMI_PROPERTY_SIZE].type;
> +	element = &elements[HP_WMI_PROPERTY_SIZE];
> +	type = element->type;
>  	switch (type) {
>  	case ACPI_TYPE_INTEGER:
>  		is_new = true;
>  		last_prop = HP_WMI_PROPERTY_RATE_UNITS;
>  		break;
>  
> +	case ACPI_TYPE_BUFFER:
> +		if (!is_raw_wmi_string(element->buffer.pointer,
> +				       element->buffer.length))
> +			return -EINVAL;
> +		fallthrough;
> +
>  	case ACPI_TYPE_STRING:
>  		is_new = false;
>  		last_prop = HP_WMI_PROPERTY_CURRENT_READING;
> @@ -631,6 +637,10 @@ static int check_numeric_sensor_wobj(const union acpi_object *wobj,
>  	for (i = 0; i < elem_count && prop <= last_prop; i++, prop++) {
>  		type = elements[i].type;
>  		valid_type = hp_wmi_property_map[prop];
> +		if (type == ACPI_TYPE_BUFFER &&
> +		    is_raw_wmi_string(elements[i].buffer.pointer,
> +				      elements[i].buffer.length))
> +			type = ACPI_TYPE_STRING;
>  		if (type != valid_type)
>  			return -EINVAL;
>  
> @@ -651,6 +661,10 @@ static int check_numeric_sensor_wobj(const union acpi_object *wobj,
>  			/* PossibleStates[0] has already been type-checked. */
>  			for (j = 0; i + 1 < elem_count && j + 1 < count; j++) {
>  				type = elements[++i].type;
> +				if (type == ACPI_TYPE_BUFFER &&
> +				    is_raw_wmi_string(elements[i].buffer.pointer,
> +						      elements[i].buffer.length))
> +					type = ACPI_TYPE_STRING;
>  				if (type != valid_type)
>  					return -EINVAL;
>  			}