[ARM] 3345/1: Fix interday RTC alarms

Patch from Uli Luckas

This is a bugfix.

The comment in arch/arm/common/rtctime.c explains it:
* FIXME: for now, we just copy the alarm time because we're lazy (and
* is therefore buggy - setting a 10am alarm at 8pm will not result in
* the alarm triggering.)

This patch adds one day to the alarm iff the alarm wrapped beyond midnight and therefore appears to be in the past.

Signed-off-by: Uli Luckas <u.luckas@road-gmbh.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 12 insertions, 4 deletions

diff --git a/arch/arm/common/rtctime.c b/arch/arm/common/rtctime.c
index 48b1e19b131f..e851d86c212c 100644
--- a/arch/arm/common/rtctime.c
+++ b/arch/arm/common/rtctime.c
@@ -128,19 +128,27 @@ EXPORT_SYMBOL(rtc_tm_to_time);
 /*
  * Calculate the next alarm time given the requested alarm time mask
  * and the current time.
- *
- * FIXME: for now, we just copy the alarm time because we're lazy (and
- * is therefore buggy - setting a 10am alarm at 8pm will not result in
- * the alarm triggering.)
  */
 void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, struct rtc_time *alrm)
 {
+        unsigned long next_time;
+        unsigned long now_time;
+
         next->tm_year = now->tm_year;
         next->tm_mon = now->tm_mon;
         next->tm_mday = now->tm_mday;
         next->tm_hour = alrm->tm_hour;
         next->tm_min = alrm->tm_min;
         next->tm_sec = alrm->tm_sec;
+
+        rtc_tm_to_time(now, &now_time);
+        rtc_tm_to_time(next, &next_time);
+
+        if (next_time < now_time) {
+                /* Advance one day */
+                next_time += 60 * 60 * 24;
+                rtc_time_to_tm(next_time, next);
+        }
 }
 
 static inline int rtc_read_time(struct rtc_ops *ops, struct rtc_time *tm)