[PATCH 3/3] qemu: set tap device online for type='ethernet'

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When support for auto-creating tap devices was added to <interface
type='ethernet'> in commit 9717d6, the code assumed that
virNetDevTapCreate() would honor the *_CREATE_IFUP flag that is
supported by virNetDevTapCreateInBridgePort(). That isn't the case -
the latter function performs several operations, and one of them is
setting the tap device online. But virNetDevTapCreate() *only* creates
the tap device, and relies on the caller to do everything else, so
qemuInterfaceEthernetConnect() needs to call virNetDevSetOnline()
after the device is successfully created.
---
 src/qemu/qemu_interface.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/qemu/qemu_interface.c b/src/qemu/qemu_interface.c
index e327133..455c2d0 100644
--- a/src/qemu/qemu_interface.c
+++ b/src/qemu/qemu_interface.c
@@ -453,6 +453,9 @@ qemuInterfaceEthernetConnect(virDomainDefPtr def,
     if (virNetDevSetMAC(net->ifname, &tapmac) < 0)
         goto cleanup;
 
+    if (virNetDevSetOnline(net->ifname, true) < 0)
+        goto cleanup;
+
     if (net->script &&
         virNetDevRunEthernetScript(net->ifname, net->script) < 0)
         goto cleanup;
-- 
2.7.4

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