From faae443738c6f0dac9b0d3d11d108f6911a989a9 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 14 Apr 2023 16:00:48 +0200
Subject: [PATCH] ACPI: bus: Ensure that notify handlers are not running after removal
Git-commit: faae443738c6f0dac9b0d3d11d108f6911a989a9
Patch-mainline: v6.4-rc1
References: git-fixes

Currently, acpi_device_remove_notify_handler() may return while the
notify handler being removed is still running which may allow the
module holding that handler to be torn down prematurely.

Address this issue by making acpi_device_remove_notify_handler() wait
for the handling of all the ACPI events in progress to complete before
returning.

Fixes: 5894b0c46e49 ("ACPI / scan: Move bus operations and notification routines to bus.c")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/acpi/bus.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -572,6 +572,7 @@ static void acpi_device_remove_notify_ha
 	else
 		acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 					   acpi_notify_device);
+	acpi_os_wait_events_complete();
 }
 
 /* Handle events targeting \_SB device (at present only graceful shutdown) */