From: VMware, Inc <>
Date: Thu, 24 Feb 2011 21:28:10 +0000 (-0800)
Subject: lib/lock: fix stdDev
X-Git-Tag: 2011.02.23-368700~69
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ac06e68b6c5c69f896da28ed39bed6ee84ccf175;p=thirdparty%2Fopen-vm-tools.git

lib/lock: fix stdDev

The standard deviation computation is incorrect when then
there are multiple observations and they are all 0.

Signed-off-by: Marcelo Vanzin <mvanzin@vmware.com>
---

diff --git a/open-vm-tools/lib/lock/ulStats.c b/open-vm-tools/lib/lock/ulStats.c
index 98963ad4f..2bc66e108 100644
--- a/open-vm-tools/lib/lock/ulStats.c
+++ b/open-vm-tools/lib/lock/ulStats.c
@@ -538,6 +538,10 @@ MXUserSqrt(double x)  // IN: hack until next round when FP goes away
    double xn;
    double xn1 = x;
 
+   if (x == 0.0) {
+      return 0.0;
+   }
+
    do {
       xn = xn1;
       xn1 = (xn + x/xn) / 2.0;