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ACPI: bus: Ensure that notify handlers are not running after removal

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[ Upstream commit faae443738 ]

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: 5894b0c46e ("ACPI / scan: Move bus operations and notification routines to bus.c")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafael J. Wysocki 2023-04-14 16:00:48 +02:00 committed by Greg Kroah-Hartman
parent 290e26ec0d
commit 0985838a9c
1 changed files with 1 additions and 0 deletions
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drivers/acpi/bus.c
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@ -586,6 +586,7 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device,
acpi_remove_notify_handler(device->handle, type,
acpi_notify_device);
}
acpi_os_wait_events_complete();
}
/* Handle events targeting \_SB device (at present only graceful shutdown) */