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Without this patch, the "cat /sys/class/net/ethN/operstate" shows "unknown", and "ethtool ethN" shows "Link detected: yes", when VM boots up with or without vNIC connected. This patch fixed the problem. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>