rtc: Fix some bugs that allowed accumulating time drift in suspend/resume

The current code checks if abs(delta_delta.tv_sec) is greater or
equal to two before it discards the old delta value, but this can
trigger at close to -1 seconds since -1.000000001 seconds is stored
as tv_sec -2 and tv_nsec 999999999 in a normalized timespec.

rtc_resume had an early return check if the rtc value had not changed
since rtc_suspend. This effectivly stops time for the duration of the
short sleep. Check if sleep_time is positive after all the adjustments
have been applied instead since this allows the old_system adjustment
in rtc_suspend to have an effect even for short sleep cycles.

CC: stable@kernel.org
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 01a7df5..b82a155 100644 (file)
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -66,7 +66,7 @@ static int rtc_suspend(struct device *dev, pm_message_t mesg)
         */
        delta = timespec_sub(old_system, old_rtc);
        delta_delta = timespec_sub(delta, old_delta);
-       if (abs(delta_delta.tv_sec)  >= 2) {
+       if (delta_delta.tv_sec < -2 || delta_delta.tv_sec >= 2) {
                /*
                 * if delta_delta is too large, assume time correction
                 * has occured and set old_delta to the current delta.
@@ -100,9 +100,8 @@ static int rtc_resume(struct device *dev)
        rtc_tm_to_time(&tm, &new_rtc.tv_sec);
        new_rtc.tv_nsec = 0;
 
-       if (new_rtc.tv_sec <= old_rtc.tv_sec) {
-               if (new_rtc.tv_sec < old_rtc.tv_sec)
-                       pr_debug("%s:  time travel!\n", dev_name(&rtc->dev));
+       if (new_rtc.tv_sec < old_rtc.tv_sec) {
+               pr_debug("%s:  time travel!\n", dev_name(&rtc->dev));
                return 0;
        }
 
@@ -119,7 +118,8 @@ static int rtc_resume(struct device *dev)
        sleep_time = timespec_sub(sleep_time,
                        timespec_sub(new_system, old_system));
 
-       timekeeping_inject_sleeptime(&sleep_time);
+       if (sleep_time.tv_sec >= 0)
+               timekeeping_inject_sleeptime(&sleep_time);
        return 0;
 }