From: John Ferlan <jferlan@redhat.com>
Date: Fri, 7 Oct 2016 12:28:58 +0000 (-0400)
Subject: util: Check/ignore already disabled event
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=0f3f8ac97efed4a5c574e6b51e356cea2f825fcf;p=libvirt.git

util: Check/ignore already disabled event

If the event is already disabled, then don't bother with setting it
disabled again.  Causes unnecessary error on systems that don't support
the feature anyway.
---

diff --git a/src/util/virperf.c b/src/util/virperf.c
index 638743098b..5d57962442 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -234,6 +234,9 @@ virPerfEventDisable(virPerfPtr perf,
     if (event == NULL)
         return -1;
 
+    if (!event->enabled)
+        return 0;
+
     if (ioctl(event->fd, PERF_EVENT_IOC_DISABLE) < 0) {
         virReportSystemError(errno,
                              _("unable to disable host cpu perf event for %s"),