rtc: interface: Ensure alarm irq is enabled when UIE is enabled

When setting a normal alarm, user-space is responsible for using
RTC_AIE_ON/RTC_AIE_OFF to control if alarm irq should be enabled.

But when RTC_UIE_ON is used, interrupts must be enabled so that the
requested irq events are generated.
When RTC_UIE_OFF is used, alarm irq is disabled if there are no other
alarms queued, so this commit brings symmetry to that.

Signed-off-by: Esben Haabendal <esben@geanix.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250516-rtc-uie-irq-fixes-v2-5-3de8e530a39e@geanix.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 6fafe2a4ae4f133bf1ab37f71827b33c545a0c90..b8b298efd9a9c362b1b31bf7769015a61bc5615d 100644 (file)
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -617,6 +617,10 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)
                rtc->uie_rtctimer.node.expires = ktime_add(now, onesec);
                rtc->uie_rtctimer.period = ktime_set(1, 0);
                err = rtc_timer_enqueue(rtc, &rtc->uie_rtctimer);
+               if (!err && rtc->ops && rtc->ops->alarm_irq_enable)
+                       err = rtc->ops->alarm_irq_enable(rtc->dev.parent, 1);
+               if (err)
+                       goto out;
        } else {
                rtc_timer_remove(rtc, &rtc->uie_rtctimer);
        }