[PATCH] Do not probe for power mgmt capabilities in lxc emulator

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It fails after 30 seconds with this error:
error : virDBusCall:1429 : error from service: CanSuspend:
Did not receive a reply. Possible causes include: the remote
application did not send a reply, the message bus security
policy blocked the reply, the reply timeout expired, or the
network connection was broken.

Only probe for the power mgmt capabilities when driver is non-NULL.
This speeds up domain startup by 30 seconds.

https://bugzilla.redhat.com/show_bug.cgi?id=1159227
---
 src/lxc/lxc_conf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lxc/lxc_conf.c b/src/lxc/lxc_conf.c
index 17df7a8..e713ff8 100644
--- a/src/lxc/lxc_conf.c
+++ b/src/lxc/lxc_conf.c
@@ -82,7 +82,9 @@ virCapsPtr virLXCDriverCapsInit(virLXCDriverPtr driver)
         VIR_WARN("Failed to query host NUMA topology, disabling NUMA capabilities");
     }
 
-    if (virNodeSuspendGetTargetMask(&caps->host.powerMgmt) < 0)
+    /* Only probe for power management capabilities in the driver,
+     * not in the emulator */
+    if (driver && virNodeSuspendGetTargetMask(&caps->host.powerMgmt) < 0)
         VIR_WARN("Failed to get host power management capabilities");
 
     if (virGetHostUUID(caps->host.host_uuid)) {
-- 
2.0.4

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