linux-kernel - [PATCH AUTOSEL 6.7 15/18] platform/x86: wmi: Remove ACPI handlers after WMI devices

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Date: Mon, 15 Jan 2024 19:12:57 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Armin Wolf <W_Armin@....de>,
	Hans de Goede <hdegoede@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	ilpo.jarvinen@...ux.intel.com,
	platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 6.7 15/18] platform/x86: wmi: Remove ACPI handlers after WMI devices

From: Armin Wolf <W_Armin@....de>

[ Upstream commit 22574e17626391ad969af9a13aaa58a1b37ad384 ]

When removing the ACPI notify/address space handlers, the WMI devices
are still active and might still depend on ACPI EC access or
WMI events.
Fix this by removing the ACPI handlers after all WMI devices
associated with an ACPI device have been removed.

Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Armin Wolf <W_Armin@....de>
Link: https://lore.kernel.org/r/20231218192420.305411-3-W_Armin@gmx.de
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/wmi.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 5dd22258cb3b..d400e61d6801 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -1494,13 +1494,12 @@ static void acpi_wmi_remove(struct platform_device *device)
 	struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
 	struct device *wmi_bus_device = dev_get_drvdata(&device->dev);
 
-	acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY,
-				   acpi_wmi_notify_handler);
-	acpi_remove_address_space_handler(acpi_device->handle,
-				ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
-
 	device_for_each_child_reverse(wmi_bus_device, NULL, wmi_remove_device);
 	device_unregister(wmi_bus_device);
+
+	acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY, acpi_wmi_notify_handler);
+	acpi_remove_address_space_handler(acpi_device->handle, ACPI_ADR_SPACE_EC,
+					  &acpi_wmi_ec_space_handler);
 }
 
 static int acpi_wmi_probe(struct platform_device *device)
-- 
2.43.0