linux-kernel - [PATCH 3/3] platform/x86: wmi: Remove obsolete duplicate GUID allowlist

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Message-Id: <20240226193557.2888-3-W_Armin@gmx.de>
Date: Mon, 26 Feb 2024 20:35:57 +0100
From: Armin Wolf <W_Armin@....de>
To: jithu.joseph@...el.com,
	linux@...ssschuh.net,
	pali@...nel.org
Cc: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	Dell.Client.Kernel@...l.com,
	jdelvare@...e.com,
	linux@...ck-us.net,
	platform-driver-x86@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] platform/x86: wmi: Remove obsolete duplicate GUID allowlist

The whitelist-based approach for preventing older WMI drivers from
being instantiated multiple times has many drawbacks:

- uses cannot see all available WMI devices (if not whitelisted)
- whitelisting a WMI driver requires changes in the WMI driver core
- maintenance burden for driver and subsystem developers

Since the WMI driver core already takes care that older WMI drivers
are not being instantiated multiple times, remove the now redundant
whitelist.

Tested on a ASUS Prime B650-Plus.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/platform/x86/wmi.c | 39 --------------------------------------
 1 file changed, 39 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 349deced87e8..1920e115da89 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -90,16 +90,6 @@ static const struct acpi_device_id wmi_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, wmi_device_ids);

-/* allow duplicate GUIDs as these device drivers use struct wmi_driver */
-static const char * const allow_duplicates[] = {
-	"05901221-D566-11D1-B2F0-00A0C9062910",	/* wmi-bmof */
-	"8A42EA14-4F2A-FD45-6422-0087F7A7E608",	/* dell-wmi-ddv */
-	"44FADEB1-B204-40F2-8581-394BBDC1B651",	/* intel-wmi-sbl-fw-update */
-	"86CCFD48-205E-4A77-9C48-2021CBEDE341",	/* intel-wmi-thunderbolt */
-	"F1DDEE52-063C-4784-A11E-8A06684B9B01",	/* dell-smm-hwmon */
-	NULL
-};
-
 #define dev_to_wblock(__dev)	container_of_const(__dev, struct wmi_block, dev.dev)
 #define dev_to_wdev(__dev)	container_of_const(__dev, struct wmi_device, dev)

@@ -1093,32 +1083,6 @@ static int wmi_add_device(struct platform_device *pdev, struct wmi_device *wdev)
 	return device_add(&wdev->dev);
 }

-static bool guid_already_parsed_for_legacy(struct acpi_device *device, const guid_t *guid)
-{
-	struct wmi_block *wblock;
-
-	list_for_each_entry(wblock, &wmi_block_list, list) {
-		/* skip warning and register if we know the driver will use struct wmi_driver */
-		for (int i = 0; allow_duplicates[i] != NULL; i++) {
-			if (guid_parse_and_compare(allow_duplicates[i], guid))
-				return false;
-		}
-		if (guid_equal(&wblock->gblock.guid, guid)) {
-			/*
-			 * Because we historically didn't track the relationship
-			 * between GUIDs and ACPI nodes, we don't know whether
-			 * we need to suppress GUIDs that are unique on a
-			 * given node but duplicated across nodes.
-			 */
-			dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n",
-				 guid, dev_name(&wblock->acpi_device->dev));
-			return true;
-		}
-	}
-
-	return false;
-}
-
 /*
  * Parse the _WDG method for the GUID data blocks
  */
@@ -1157,9 +1121,6 @@ static int parse_wdg(struct device *wmi_bus_dev, struct platform_device *pdev)
 			continue;
 		}

-		if (guid_already_parsed_for_legacy(device, &gblock[i].guid))
-			continue;
-
 		wblock = kzalloc(sizeof(*wblock), GFP_KERNEL);
 		if (!wblock)
 			continue;
--
2.39.2