vlan: fail early when creating netdev named config
Similarly, vlan will create /proc/net/vlan/<dev>, so when we create dev with name "config", it will confict with /proc/net/vlan/config. Reported-by: NStephane Chazelas <stephane.chazelas@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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