From: Armin Wolf <W_Armin@gmx.de>
Date: Fri, 24 Mar 2023 20:26:27 +0000 (+0100)
Subject: ACPI: EC: Fix oops when removing custom query handlers
X-Git-Tag: baikal/aarch64/sdk5.10~143
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=114b59714631fd2b620758bc99d9708c62516108;p=kernel.git

ACPI: EC: Fix oops when removing custom query handlers

[ Upstream commit e5b492c6bb900fcf9722e05f4a10924410e170c1 ]

When removing custom query handlers, the handler might still
be used inside the EC query workqueue, causing a kernel oops
if the module holding the callback function was already unloaded.

Fix this by flushing the EC query workqueue when removing
custom query handlers.

Tested on a Acer Travelmate 4002WLMi

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index defc5796b5084..c7baccd47b89f 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1118,6 +1118,7 @@ static void acpi_ec_remove_query_handlers(struct acpi_ec *ec,
 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
 {
 	acpi_ec_remove_query_handlers(ec, false, query_bit);
+	flush_workqueue(ec_query_wq);
 }
 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);