linux-kernel - [PATCH v2 3/5] platform/x86: wmi: Remove wmi_get_event

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Message-Id: <20240901031055.3030-4-W_Armin@gmx.de>
Date: Sun,  1 Sep 2024 05:10:53 +0200
From: Armin Wolf <W_Armin@....de>
To: james@...iv.tech,
	jlee@...e.com,
	corentin.chary@...il.com,
	luke@...nes.dev,
	matan@...alib.org,
	coproscefalo@...il.com
Cc: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	linux@...ck-us.net,
	jdelvare@...e.com,
	rafael@...nel.org,
	lenb@...nel.org,
	platform-driver-x86@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/5] platform/x86: wmi: Remove wmi_get_event_data()

Since the WMI driver core now takes care of retrieving the
WMI event data even for legacy WMI notify handlers, this
function is no longer used.

Remove it to prevent WMI drivers from messing up the ACPI
firmware on some machines.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/platform/x86/wmi.c | 57 --------------------------------------
 include/linux/acpi.h       |  1 -
 2 files changed, 58 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 6ab181dd94ab..c7f0754f74b4 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -199,23 +199,6 @@ static int wmidev_match_guid(struct device *dev, const void *data)
 	return 0;
 }

-static int wmidev_match_notify_id(struct device *dev, const void *data)
-{
-	struct wmi_block *wblock = dev_to_wblock(dev);
-	const u32 *notify_id = data;
-
-	/* Legacy GUID-based functions are restricted to only see
-	 * a single WMI device for each GUID.
-	 */
-	if (test_bit(WMI_GUID_DUPLICATED, &wblock->flags))
-		return 0;
-
-	if (wblock->gblock.flags & ACPI_WMI_EVENT && wblock->gblock.notify_id == *notify_id)
-		return 1;
-
-	return 0;
-}
-
 static const struct bus_type wmi_bus_type;

 static struct wmi_device *wmi_find_device_by_guid(const char *guid_string)
@@ -235,17 +218,6 @@ static struct wmi_device *wmi_find_device_by_guid(const char *guid_string)
 	return dev_to_wdev(dev);
 }

-static struct wmi_device *wmi_find_event_by_notify_id(const u32 notify_id)
-{
-	struct device *dev;
-
-	dev = bus_find_device(&wmi_bus_type, NULL, &notify_id, wmidev_match_notify_id);
-	if (!dev)
-		return ERR_PTR(-ENODEV);
-
-	return to_wmi_device(dev);
-}
-
 static void wmi_device_put(struct wmi_device *wdev)
 {
 	put_device(&wdev->dev);
@@ -649,35 +621,6 @@ acpi_status wmi_remove_notify_handler(const char *guid)
 }
 EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);

-/**
- * wmi_get_event_data - Get WMI data associated with an event (deprecated)
- *
- * @event: Event to find
- * @out: Buffer to hold event data
- *
- * Get extra data associated with an WMI event, the caller needs to free @out.
- *
- * Return: acpi_status signaling success or error.
- */
-acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
-{
-	struct wmi_block *wblock;
-	struct wmi_device *wdev;
-	acpi_status status;
-
-	wdev = wmi_find_event_by_notify_id(event);
-	if (IS_ERR(wdev))
-		return AE_NOT_FOUND;
-
-	wblock = container_of(wdev, struct wmi_block, dev);
-	status = get_event_data(wblock, out);
-
-	wmi_device_put(wdev);
-
-	return status;
-}
-EXPORT_SYMBOL_GPL(wmi_get_event_data);
-
 /**
  * wmi_has_guid - Check if a GUID is available
  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index eed105b1fbfb..3cbe4b57bc73 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -401,7 +401,6 @@ extern acpi_status wmi_set_block(const char *guid, u8 instance,
 extern acpi_status wmi_install_notify_handler(const char *guid,
 					wmi_notify_handler handler, void *data);
 extern acpi_status wmi_remove_notify_handler(const char *guid);
-extern acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out);
 extern bool wmi_has_guid(const char *guid);
 extern char *wmi_get_acpi_device_uid(const char *guid);

--
2.39.2