static int ec_install_handlers(struct acpi_ec *ec)
{
	acpi_status status;
	if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
		return 0;
	status = acpi_install_gpe_handler(NULL, ec->gpe,
				  ACPI_GPE_EDGE_TRIGGERED,
				  &acpi_ec_gpe_handler, ec);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	acpi_enable_gpe(NULL, ec->gpe);
	status = acpi_install_address_space_handler(ec->handle,
						    ACPI_ADR_SPACE_EC,
						    &acpi_ec_space_handler,
						    NULL, ec);
	if (ACPI_FAILURE(status)) {
		if (status == AE_NOT_FOUND) {
			/*
			 * Maybe OS fails in evaluating the _REG object.
			 * The AE_NOT_FOUND error will be ignored and OS
			 * continue to initialize EC.
			 */
			printk(KERN_ERR "Fail in evaluating the _REG object"
				" of EC device. Broken bios is suspected.\n");
		} else {
			acpi_remove_gpe_handler(NULL, ec->gpe,
				&acpi_ec_gpe_handler);
			acpi_disable_gpe(NULL, ec->gpe);
			return -ENODEV;
		}
	}

	set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
	return 0;
}