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util: Check/ignore already disabled event

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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.
This commit is contained in:
John Ferlan 2016-10-07 08:28:58 -04:00
parent 12b2aebeba
commit 0f3f8ac97e
1 changed files with 3 additions and 0 deletions
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3
src/util/virperf.c
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@ -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"),