When using the ioctl interface it is possible to pass interfaces without name specified.

During lnet_startup_lndnet the interface name has to be checked except it is the loopback interface. If it is the only interface in the network and the network would be empty fail.

Steps to reproduce on an ioctl based interface

modprobe lnet
lnetctl lnet configure
lnetctl net add --net  o2ib --if mlxib1

lnetctl net add --net  o2ib --if mlxib1 --ip2net "o2ib 172.30.12.*"