[libvirt] [PATCHv2] qemu: fix tc old rules will be cleaned if set tc new rules fail

[Luyao Huang]

https://bugzilla.redhat.com/show_bug.cgi?id=1177723

If tc cmd failed (maybe value too large) when we use virDomainSetInterfaceParameters
, the old rules will be clean. Restore the old rules if tc failed.

Signed-off-by: Luyao Huang <lhuang at redhat.com>
---
v1 make a big mistake that i used a old libvirt

 src/qemu/qemu_driver.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 73a825d..650e0dd 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -10494,8 +10494,12 @@ qemuDomainSetInterfaceParameters(virDomainPtr dom,
                    sizeof(*newBandwidth->out));
         }
 
-        if (virNetDevBandwidthSet(net->ifname, newBandwidth, false) < 0)
+        if (virNetDevBandwidthSet(net->ifname, newBandwidth, false) < 0) {
+            ignore_value(virNetDevBandwidthSet(net->ifname,
+                                               net->bandwidth,
+                                               false));
             goto endjob;
+        }
 
         virNetDevBandwidthFree(net->bandwidth);
         if (newBandwidth->in || newBandwidth->out) {
-- 
1.8.3.1