[PATCH] qemu: fix unsuitable error report when get memory stats

[Wang Yufei <james.wangyufei@xxxxxxxxxx>]

From: Zhang Bo <oscar.zhangbo@xxxxxxxxxx>

when we run the command 'virsh dommemstat xxx',
althrough memballoon's model is set 'none' in vm's XML,
it still reports an error in libvirtd.log.
error : qemuMonitorFindBalloonObjectPath:1042 : internal error: Cannot determine balloon device path
Apparently, if we don't set memballoon, we don't need to
set balloon device path.

Signed-off-by: Wang Yufei <james.wangyufei@xxxxxxxxxx>
Signed-off-by: Zhang Bo <oscar.zhangbo@xxxxxxxxxx>
---
 .gnulib                 | 2 +-
 src/qemu/qemu_monitor.c | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/.gnulib b/.gnulib
index 875ec93..106a386 160000
--- a/.gnulib
+++ b/.gnulib
@@ -1 +1 @@
-Subproject commit 875ec93e1501d2d2a8bab1b64fa66b8ceb51dc67
+Subproject commit 106a3866d01f9dd57ab4f10dbeb0d5a8db73a9f7
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index f959b74..c72702d 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -1711,7 +1711,9 @@ qemuMonitorGetMemoryStats(qemuMonitorPtr mon,
     QEMU_CHECK_MONITOR(mon);
 
     if (mon->json) {
-        ignore_value(qemuMonitorFindBalloonObjectPath(mon, "/"));
+        if (mon->vm->def->memballoon &&
+            mon->vm->def->memballoon->model != VIR_DOMAIN_MEMBALLOON_MODEL_NONE)
+            ignore_value(qemuMonitorFindBalloonObjectPath(mon, "/"));
         mon->ballooninit = true;
         return qemuMonitorJSONGetMemoryStats(mon, mon->balloonpath,
                                              stats, nr_stats);
-- 
1.7.12.4


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