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-rw-r--r--kernel/time/alarmtimer.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 8d9f13d847..4657cb8e8b 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -290,6 +290,17 @@ static int alarmtimer_suspend(struct device *dev)
rtc_timer_cancel(rtc, &rtctimer);
rtc_read_time(rtc, &tm);
now = rtc_tm_to_ktime(tm);
+
+ /*
+ * If the RTC alarm timer only supports a limited time offset, set the
+ * alarm time to the maximum supported value.
+ * The system may wake up earlier (possibly much earlier) than expected
+ * when the alarmtimer runs. This is the best the kernel can do if
+ * the alarmtimer exceeds the time that the rtc device can be programmed
+ * for.
+ */
+ min = rtc_bound_alarmtime(rtc, min);
+
now = ktime_add(now, min);
/* Set alarm, if in the past reject suspend briefly to handle */