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-rw-r--r--drivers/rtc/rtc-cmos.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index e3fe83a23cf..29cf1457ca1 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -120,7 +120,8 @@ static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM);
if (cmos->day_alrm) {
- t->time.tm_mday = CMOS_READ(cmos->day_alrm);
+ /* ignore upper bits on readback per ACPI spec */
+ t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f;
if (!t->time.tm_mday)
t->time.tm_mday = -1;