[PATCH] rt-tests: hwlatdetect: Add check that width is not zero

Check that width is not zero before division when calculating the MTBF

Signed-off-by: John Kacur <[email protected]>
---
 src/hwlatdetect/hwlatdetect.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/hwlatdetect/hwlatdetect.py b/src/hwlatdetect/hwlatdetect.py
index abfbb954fe75..42b9f301718a 100755
--- a/src/hwlatdetect/hwlatdetect.py
+++ b/src/hwlatdetect/hwlatdetect.py
@@ -564,8 +564,9 @@ if __name__ == '__main__':
     info(f"Samples exceeding threshold: {exceeding}")
 
     if exceeding > 1:
-        mtbf = ((float(detect.last) - float(detect.first)) * int(detect.get('window'))
-                / ((exceeding - 1) * int(detect.get('width'))))
+        width = int(detect.get('width'))
+        if width > 0:
+            mtbf = (((float(detect.last) - float(detect.first)) * int(detect.get('window'))) / ((exceeding - 1) * width))
         info(f"MTBF: {mtbf:.3f} seconds")
 
     if detect.have_msr:
-- 
2.53.0