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Introduce devm_acpi_install_notify_handler() for installing an ACPI notify handler managed by devres that will be removed automatically on driver detach. It installs the notify handler on the device object in the ACPI namespace that corresponds to the owner device's ACPI companion, if present (an error is returned if the owner device doesn't have an ACPI companion). Currently, there is no way to manually remove the notify handler installed by it because none of its users brought on subsequently will need to do that. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ rjw: Kerneldoc comment refinement ] Link: https://patch.msgid.link/2268031.irdbgypaU6@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>