From ed5c43204bdad6ad887d1850b2af291ca076f5f0 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Tue, 15 Aug 2017 10:03:29 +0200
Subject: [PATCH] smooth: don't adjust invalid time of last update

---
 smooth.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/smooth.c b/smooth.c
index a035adc..a21dcd8 100644
--- a/smooth.c
+++ b/smooth.c
@@ -246,7 +246,8 @@ handle_slew(struct timespec *raw, struct timespec *cooked, double dfreq,
       update_smoothing(cooked, doffset, dfreq);
   }
 
-  UTI_AdjustTimespec(&last_update, cooked, &last_update, &delta, dfreq, doffset);
+  if (!UTI_IsZeroTimespec(&last_update))
+    UTI_AdjustTimespec(&last_update, cooked, &last_update, &delta, dfreq, doffset);
 }
 
 void SMT_Initialise(void)
@@ -264,6 +265,8 @@ void SMT_Initialise(void)
   max_freq *= 1e-6;
   max_wander *= 1e-6;
 
+  UTI_ZeroTimespec(&last_update);
+
   LCL_AddParameterChangeHandler(handle_slew, NULL);
 }