| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <70926253-9224-413d-ab54-27e24905278a@gmx.de>
Date: Thu, 2 Jan 2025 17:29:42 +0100
From: Armin Wolf <W_Armin@....de>
To: Kurt Borja <kuurtb@...il.com>, platform-driver-x86@...r.kernel.org
Cc: Dell.Client.Kernel@...l.com, hdegoede@...hat.com,
ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org,
mario.limonciello@....com
Subject: Re: [PATCH v2 10/20] alienware-wmi: Refactor LED control methods
Am 29.12.24 um 20:44 schrieb Kurt Borja:
> Both WMI devices handled by this module specify a distinct interface for
> LED control. Previously this module handled this by dynamically adapting
> arguments passed to wmi_evaluate_method() based on the `interface`
> global variable.
>
> To avoid the use of global variables, and enable the migration to
> non-deprecated WMI methods, let the WMI drivers define upd_led and
> upd_brightness operations, which completely replace
> alienware_update_led() and wmax_brightness().
>
> Also define alienware_wmi_command(), which serves as a wrapper for
> wmidev_evaluate_method(). This new method is very similar to
> alienware_wmax_command() but is WMI device agnostic.
>
> Signed-off-by: Kurt Borja <kuurtb@...il.com>
> ---
> drivers/platform/x86/dell/alienware-wmi.c | 164 ++++++++++++++--------
> 1 file changed, 102 insertions(+), 62 deletions(-)
>
> diff --git a/drivers/platform/x86/dell/alienware-wmi.c b/drivers/platform/x86/dell/alienware-wmi.c
> index 512384635c4c..494a3772065c 100644
> --- a/drivers/platform/x86/dell/alienware-wmi.c
> +++ b/drivers/platform/x86/dell/alienware-wmi.c
> @@ -418,12 +418,42 @@ struct alienfx_priv {
> u8 lighting_control_state;
> };
>
> +struct alienfx_ops {
> + int (*upd_led)(struct alienfx_priv *priv, struct wmi_device *wdev,
> + u8 location);
> + int (*upd_brightness)(struct alienfx_priv *priv, struct wmi_device *wdev,
> + u8 brightness);
> +};
> +
> struct alienfx_platdata {
> struct wmi_device *wdev;
> + struct alienfx_ops ops;
> };
>
> static u8 interface;
>
> +static 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};
> + union acpi_object *obj;
> + acpi_status ret;
> +
> + ret = wmidev_evaluate_method(wdev, 0, method_id, &in, out_data ? &out : NULL);
> + if (ACPI_FAILURE(ret))
> + return -EIO;
> +
> + obj = out.pointer;
> +
> + if (obj && obj->type == ACPI_TYPE_INTEGER) {
> + *out_data = (u32)obj->integer.value;
> + kfree(out.pointer);
If obj->type is not ACPI_TYPE_INTEGER then we have a memory leak here, so please always free obj.
Also you will dereference a NULL pointer if out_data is NULL, please check this.
Thanks,
Armin Wolf
> + }
> +
> + return 0;
> +}
> +
> /*
> * Helpers used for zone control
> */
> @@ -454,46 +484,6 @@ static int parse_rgb(const char *buf, struct color_platform *colors)
> /*
> * Individual RGB zone control
> */
> -static int alienware_update_led(struct alienfx_priv *priv, u8 location)
> -{
> - int method_id;
> - acpi_status status;
> - char *guid;
> - struct acpi_buffer input;
> - struct legacy_led_args legacy_args;
> - struct wmax_led_args wmax_basic_args;
> - if (interface == WMAX) {
> - wmax_basic_args.led_mask = 1 << location;
> - wmax_basic_args.colors = priv->colors[location];
> - wmax_basic_args.state = priv->lighting_control_state;
> - guid = WMAX_CONTROL_GUID;
> - method_id = WMAX_METHOD_ZONE_CONTROL;
> -
> - input.length = sizeof(wmax_basic_args);
> - input.pointer = &wmax_basic_args;
> - } else {
> - legacy_args.colors = priv->colors[location];
> - legacy_args.brightness = priv->global_brightness;
> - legacy_args.state = 0;
> - if (priv->lighting_control_state == LEGACY_BOOTING ||
> - priv->lighting_control_state == LEGACY_SUSPEND) {
> - guid = LEGACY_POWER_CONTROL_GUID;
> - legacy_args.state = priv->lighting_control_state;
> - } else
> - guid = LEGACY_CONTROL_GUID;
> - method_id = location + 1;
> -
> - input.length = sizeof(legacy_args);
> - input.pointer = &legacy_args;
> - }
> - pr_debug("alienware-wmi: guid %s method %d\n", guid, method_id);
> -
> - status = wmi_evaluate_method(guid, 0, method_id, &input, NULL);
> - if (ACPI_FAILURE(status))
> - pr_err("alienware-wmi: zone set failure: %u\n", status);
> - return ACPI_FAILURE(status);
> -}
> -
> static ssize_t zone_show(struct device *dev, struct device_attribute *attr,
> char *buf, u8 location)
> {
> @@ -510,13 +500,14 @@ static ssize_t zone_store(struct device *dev, struct device_attribute *attr,
> {
> struct alienfx_priv *priv = dev_get_drvdata(dev);
> struct color_platform *colors = &priv->colors[location];
> + struct alienfx_platdata *pdata = dev_get_platdata(dev);
> int ret;
>
> ret = parse_rgb(buf, colors);
> if (ret)
> return ret;
>
> - ret = alienware_update_led(priv, location);
> + ret = pdata->ops.upd_led(priv, pdata->wdev, location);
>
> return ret ? ret : count;
> }
> @@ -649,36 +640,17 @@ static struct attribute_group zone_attribute_group = {
> /*
> * LED Brightness (Global)
> */
> -static int wmax_brightness(int brightness)
> -{
> - acpi_status status;
> - struct acpi_buffer input;
> - struct wmax_brightness_args args = {
> - .led_mask = 0xFF,
> - .percentage = brightness,
> - };
> - input.length = sizeof(args);
> - input.pointer = &args;
> - status = wmi_evaluate_method(WMAX_CONTROL_GUID, 0,
> - WMAX_METHOD_BRIGHTNESS, &input, NULL);
> - if (ACPI_FAILURE(status))
> - pr_err("alienware-wmi: brightness set failure: %u\n", status);
> - return ACPI_FAILURE(status);
> -}
> -
> static void global_led_set(struct led_classdev *led_cdev,
> enum led_brightness brightness)
> {
> struct alienfx_priv *priv = container_of(led_cdev, struct alienfx_priv,
> global_led);
> + struct alienfx_platdata *pdata = dev_get_platdata(&priv->pdev->dev);
> int ret;
>
> priv->global_brightness = brightness;
>
> - if (interface == WMAX)
> - ret = wmax_brightness(brightness);
> - else
> - ret = alienware_update_led(priv, 0);
> + ret = pdata->ops.upd_brightness(priv, pdata->wdev, brightness);
> if (ret)
> pr_err("LED brightness update failed\n");
> }
> @@ -1247,10 +1219,49 @@ static void alienware_alienfx_exit(struct wmi_device *wdev)
> /*
> * Legacy WMI driver
> */
> +static int legacy_wmi_update_led(struct alienfx_priv *priv,
> + struct wmi_device *wdev, u8 location)
> +{
> + struct legacy_led_args legacy_args = {
> + .colors = priv->colors[location],
> + .brightness = priv->global_brightness,
> + .state = 0,
> + };
> + struct acpi_buffer input;
> + acpi_status status;
> +
> + if (legacy_args.state != LEGACY_RUNNING) {
> + legacy_args.state = priv->lighting_control_state;
> +
> + input.length = sizeof(legacy_args);
> + input.pointer = &legacy_args;
> +
> + status = wmi_evaluate_method(LEGACY_POWER_CONTROL_GUID, 0,
> + location + 1, &input, NULL);
> + if (ACPI_FAILURE(status))
> + return -EIO;
> +
> + return 0;
> + }
> +
> + return alienware_wmi_command(wdev, location + 1, &legacy_args,
> + sizeof(legacy_args), NULL);
> +}
> +
> +static int legacy_wmi_update_brightness(struct alienfx_priv *priv,
> + struct wmi_device *wdev, u8 brightness)
> +{
> + return legacy_wmi_update_led(priv, wdev, 0);
> +}
> +
> static int legacy_wmi_probe(struct wmi_device *wdev, const void *context)
> {
> struct alienfx_platdata pdata = {
> .wdev = wdev,
> + .ops = {
> + .upd_led = legacy_wmi_update_led,
> + .upd_brightness = legacy_wmi_update_brightness,
> + },
> };
>
> return alienware_alienfx_setup(&pdata);
> @@ -1290,10 +1301,39 @@ static void __exit alienware_legacy_wmi_exit(void)
> /*
> * WMAX WMI driver
> */
> +static int wmax_wmi_update_led(struct alienfx_priv *priv,
> + struct wmi_device *wdev, u8 location)
> +{
> + struct wmax_led_args in_args = {
> + .led_mask = 1 << location,
> + .colors = priv->colors[location],
> + .state = priv->lighting_control_state,
> + };
> +
> + return alienware_wmi_command(wdev, WMAX_METHOD_ZONE_CONTROL, &in_args,
> + sizeof(in_args), NULL);
> +}
> +
> +static int wmax_wmi_update_brightness(struct alienfx_priv *priv,
> + struct wmi_device *wdev, u8 brightness)
> +{
> + struct wmax_brightness_args in_args = {
> + .led_mask = 0xFF,
> + .percentage = brightness,
> + };
> +
> + return alienware_wmi_command(wdev, WMAX_METHOD_BRIGHTNESS, &in_args,
> + sizeof(in_args), NULL);
> +}
> +
> static int wmax_wmi_probe(struct wmi_device *wdev, const void *context)
> {
> struct alienfx_platdata pdata = {
> .wdev = wdev,
> + .ops = {
> + .upd_led = wmax_wmi_update_led,
> + .upd_brightness = wmax_wmi_update_brightness,
> + },
> };
> struct platform_device *pdev;
> int ret;
Powered by blists - more mailing lists