An interrupt might not arrive when a module is inserted. When an link status
change interrupt occurred and the driver still regard SFP as unplugged, link
becomes up and the real media type is unknown. e.g:

% ifconfig -m ixg0
(snip)
        media: Ethernet autoselect (autoselect rxpause,txpause)
        status: active
        supported Ethernet media:
                media none
                media autoselect
(snip)

To resolve this problem, when an link status change interrupt occurred and the
driver still regard SFP as unplugged, issue the module softint before issuing
LSC interrupt.

(msaitoh)