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Calling ioctl(..., RTC_UIE_ON, ...) without CONFIG_RTC_INTF_DEV_UIE_EMUL either ends in rtc_update_irq_enable if rtc->uie_unsupported is true or in __rtc_set_alarm in the if (!rtc->ops->set_alarm) branch. In both cases the return value is -EINVAL. So check for that one instead of ENOTTY. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>