Yes, I think it is guaranteed that the handler is not running: 1) the namespace is locked during the removal. 2) EvDetachRegion is called which runs the _REG method indicating that the region is no longer available. -----Original Message----- From: Heiner Kallweit <hkallweit1@xxxxxxxxx> Sent: Saturday, September 04, 2021 9:42 AM To: Moore, Robert <robert.moore@xxxxxxxxx>; Erik Kaneda <erik.kaneda@xxxxxxxxx>; Wysocki, Rafael J <rafael.j.wysocki@xxxxxxxxx> Cc: linux-acpi@xxxxxxxxxxxxxxx; Jean Delvare <jdelvare@xxxxxxxx> Subject: Question about acpi_remove_address_space_handler() behavior if handler is running i801 i2c driver installs an own ACPI io handler. When discussing some driver improvements one open question is about behavior of acpi_remove_address_space_handler() if the handler is currently running. Will the function wait until handler is finished? In other words, the actual question is: Are we guaranteed that after the call to acpi_remove_address_space_handler() the handler can't be running?
