Re: [PATCH v2] platform/x86: alienware-wmi-base: Transition to new WMI API

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

On Tue, 31 Mar 2026, Kurt Borja wrote:

> Transition to the new wmi_buffer based WMI API.
> 
> Signed-off-by: Kurt Borja <kuurtb@gmail.com>
> ---
> v2:
>   - Cast wmi_buffer data to __le32 and then use le32_to_cpu() before
>     returning
> 
> v1: https://patch.msgid.link/20260330-aw-new-api-v1-1-95910bfa1b38@gmail.com
> ---
>  drivers/platform/x86/dell/alienware-wmi-base.c | 32 +++++++++++++++-----------
>  1 file changed, 19 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell/alienware-wmi-base.c b/drivers/platform/x86/dell/alienware-wmi-base.c
> index 64562b92314f..9abdc5de8e23 100644
> --- a/drivers/platform/x86/dell/alienware-wmi-base.c
> +++ b/drivers/platform/x86/dell/alienware-wmi-base.c
> @@ -9,11 +9,13 @@
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>  
>  #include <linux/acpi.h>
> -#include <linux/cleanup.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/dmi.h>
>  #include <linux/leds.h>
> +
> +#include <asm/byteorder.h>
> +
>  #include "alienware-wmi.h"
>  
>  MODULE_AUTHOR("Mario Limonciello <mario.limonciello@outlook.com>");
> @@ -150,23 +152,27 @@ u8 alienware_interface;
>  int alienware_wmi_command(struct wmi_device *wdev, u32 method_id,
>  			  void *in_args, size_t in_size, u32 *out_data)
>  {
> -	struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
> -	struct acpi_buffer in = {in_size, in_args};
> -	acpi_status ret;
> +	struct wmi_buffer out, in = {
> +		.data = in_args,
> +		.length = in_size,
> +	};
> +	int ret;
>  
> -	ret = wmidev_evaluate_method(wdev, 0, method_id, &in, out_data ? &out : NULL);
> -	if (ACPI_FAILURE(ret))
> -		return -EIO;
> +	ret = wmidev_invoke_method(wdev, 0, method_id, &in, out_data ? &out : NULL);
> +	if (ret)
> +		return ret;
>  
> -	union acpi_object *obj __free(kfree) = out.pointer;
> +	if (!out_data)
> +		return 0;
>  
> -	if (out_data) {
> -		if (obj && obj->type == ACPI_TYPE_INTEGER)
> -			*out_data = (u32)obj->integer.value;
> -		else
> -			return -ENOMSG;
> +	if (out.length < sizeof(*out_data)) {
> +		kfree(out.data);
> +		return -ENOMSG;
>  	}
>  
> +	*out_data = le32_to_cpu(*(__le32 *)out.data);
> +	kfree(out.data);

Hi,

Please don't bring back duplicated kfree() calls. Just assign out.data 
into a local variable so you can use __free() for it similar to what the 
old code did.

-- 
 i.