From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu, 8 Dec 2016 12:07:50 +0000 (+0100)
Subject: refclock: slew last sample even after it was used
X-Git-Tag: 3.0-pre1~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c11044ee20000d604aab43dbb58589dc0b3535d;p=thirdparty%2Fchrony.git

refclock: slew last sample even after it was used

It may be needed by locked PPS refclocks.
---

diff --git a/refclock.c b/refclock.c
index e3287314..1fceea48 100644
--- a/refclock.c
+++ b/refclock.c
@@ -939,11 +939,22 @@ filter_get_sample(struct MedianFilter *filter, struct timespec *sample_time, dou
 static void
 filter_slew_samples(struct MedianFilter *filter, struct timespec *when, double dfreq, double doffset)
 {
-  int i;
+  int i, first, last;
   double delta_time;
   struct timespec *sample;
 
-  for (i = 0; i < filter->used; i++) {
+  if (filter->last < 0)
+    return;
+
+  /* always slew the last sample as it may be needed by PPS refclocks */
+  if (filter->used > 0) {
+    first = 0;
+    last = filter->used - 1;
+  } else {
+    first = last = filter->last;
+  }
+
+  for (i = first; i <= last; i++) {
     sample = &filter->samples[i].sample_time;
     UTI_AdjustTimespec(sample, when, sample, &delta_time, dfreq, doffset);
     filter->samples[i].offset -= delta_time;