trxcon/sched_clck.c: fix time delta calculations

Use osmo_clock_gettime() to read the monotonic clock instead
of gettimeofday() which could drift backwards.
This requires switching the scheduler clock from struct timeval
to struct timespec. Expand some variables to 64 bits in order
to keep types used in calculations compatible.

The previous implementation unconditionally subtracted microsecond
values from different time measurements, causing overflow if the
current measurement was taken in less of a fraction of a second
than the past measurement. Use timespecsub() for the subtraction
instead which accounts for fractions of a second correctly.

Change-Id: Ic93f90685c6d6dc28dfc4ad48c998e0eac113cf8
Related: OS#3467

1 files changed, 1 insertions, 1 deletions

diff --git a/src/host/trxcon/scheduler.h b/src/host/trxcon/scheduler.h
index f36c3b2b..6c3a2f20 100644
--- a/src/host/trxcon/scheduler.h
+++ b/src/host/trxcon/scheduler.h
@@ -21,7 +21,7 @@ struct trx_sched {
 	/*! \brief Clock state */
 	uint8_t state;
 	/*! \brief Local clock source */
-	struct timeval clock;
+	struct timespec clock;
 	/*! \brief Count of processed frames */
 	uint32_t fn_counter_proc;
 	/*! \brief Local frame counter advance */