This is a note to let you know that I've just added the patch titled
ACPI: bus: Ensure that notify handlers are not running after removal
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-bus-ensure-that-notify-handlers-are-not-running.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 88f7e28a42c0c05ab4011aa138a9beec76061618
Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Date: Fri Apr 14 16:00:48 2023 +0200
ACPI: bus: Ensure that notify handlers are not running after removal
[ Upstream commit faae443738c6f0dac9b0d3d11d108f6911a989a9 ]
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@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 3b6146b1e25cc..a16b7de73d164 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -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) */
