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ACPI: EC: Fix oops when removing custom query handlers

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[ Upstream commit e5b492c6bb ]

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>
This commit is contained in:
Armin Wolf 2023-03-24 21:26:27 +01:00 • committed by Greg Kroah-Hartman
commit 066b90bca7
1 changed files with 1 additions and 0 deletions
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drivers/acpi/ec.c
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@ -1114,6 +1114,7 @@ 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);