From 01b0ab8dce68e49217f467aaf0446fc19e93756f Mon Sep 17 00:00:00 2001
From: Sergei Trofimov <sergei.trofimov@arm.com>
Date: Tue, 21 Nov 2017 16:51:53 +0000
Subject: [PATCH] derived/fps: fix divide by zero

Avoid dividing by frame_count if it's zero when calculating janks_pc.
---
 devlib/derived/fps.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/devlib/derived/fps.py b/devlib/derived/fps.py
index 2695c4c..47156a4 100644
--- a/devlib/derived/fps.py
+++ b/devlib/derived/fps.py
@@ -177,11 +177,13 @@ class DerivedSurfaceFlingerStats(DerivedFpsStats):
             janks = 0
             not_at_vsync = 0
 
+        janks_pc =  0 if frame_count == 0 else janks * 100 / frame_count
+
         return [DerivedMetric('fps', fps, 'fps'),
                 DerivedMetric('total_frames', frame_count, 'frames'),
                 MeasurementsCsv(csv_file),
                 DerivedMetric('janks', janks, 'count'),
-                DerivedMetric('janks_pc', janks * 100 / frame_count, 'percent'),
+                DerivedMetric('janks_pc', janks_pc, 'percent'),
                 DerivedMetric('missed_vsync', not_at_vsync, 'count')]
 
     def _process_without_pandas(self, measurements_csv):