rtc: Update interface.c to use y2038-safe time interfaces

Currently, interface.c uses y2038 problematic rtc_tm_to_time()
and rtc_time_to_tm(). So replace them with their corresponding
y2038-safe versions: rtc_tm_to_time64() and rtc_time64_to_tm().

Cc: pang.xunlei <pang.xunlei@linaro.org>
Cc: Arnd Bergmann <arnd.bergmann@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 10 insertions, 12 deletions

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 45bfc28ee3aa..37215cf983e9 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -73,10 +73,8 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
         else if (rtc->ops->set_time)
                 err = rtc->ops->set_time(rtc->dev.parent, tm);
         else if (rtc->ops->set_mmss) {
-                unsigned long secs;
-                err = rtc_tm_to_time(tm, &secs);
-                if (err == 0)
-                        err = rtc->ops->set_mmss(rtc->dev.parent, secs);
+                time64_t secs64 = rtc_tm_to_time64(tm);
+                err = rtc->ops->set_mmss(rtc->dev.parent, secs64);
         } else
                 err = -EINVAL;
 
@@ -105,7 +103,7 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs)
 
                 err = rtc->ops->read_time(rtc->dev.parent, &old);
                 if (err == 0) {
-                        rtc_time_to_tm(secs, &new);
+                        rtc_time64_to_tm(secs, &new);
 
                         /*
                          * avoid writing when we're going to change the day of
@@ -157,7 +155,7 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
         int err;
         struct rtc_time before, now;
         int first_time = 1;
-        unsigned long t_now, t_alm;
+        time64_t t_now, t_alm;
         enum { none, day, month, year } missing = none;
         unsigned days;
 
@@ -258,8 +256,8 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
         }
 
         /* with luck, no rollover is needed */
-        rtc_tm_to_time(&now, &t_now);
-        rtc_tm_to_time(&alarm->time, &t_alm);
+        t_now = rtc_tm_to_time64(&now);
+        t_alm = rtc_tm_to_time64(&alarm->time);
         if (t_now < t_alm)
                 goto done;
 
@@ -273,7 +271,7 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
         case day:
                 dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day");
                 t_alm += 24 * 60 * 60;
-                rtc_time_to_tm(t_alm, &alarm->time);
+                rtc_time64_to_tm(t_alm, &alarm->time);
                 break;
 
         /* Month rollover ... if it's the 31th, an alarm on the 3rd will
@@ -346,19 +344,19 @@ EXPORT_SYMBOL_GPL(rtc_read_alarm);
 static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 {
         struct rtc_time tm;
-        long now, scheduled;
+        time64_t now, scheduled;
         int err;
 
         err = rtc_valid_tm(&alarm->time);
         if (err)
                 return err;
-        rtc_tm_to_time(&alarm->time, &scheduled);
+        scheduled = rtc_tm_to_time64(&alarm->time);
 
         /* Make sure we're not setting alarms in the past */
         err = __rtc_read_time(rtc, &tm);
         if (err)
                 return err;
-        rtc_tm_to_time(&tm, &now);
+        now = rtc_tm_to_time64(&tm);
         if (scheduled <= now)
                 return -ETIME;
         /*