[Bug 295985] e6000sw not connecting over mdio bus to Marvel 88E6190

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295985

--- Comment #6 from Adrian Chadd <adrian@freebsd.org> ---
It's happening because the iflib (iflib_device_register()) path holds the iflib
lock during the call to ixgbe_if_attach_post().

It's not holding it across ether_attach() because that's where the initial
miibus stuff happens and similar locking stuff would cause the same failure
drama.

This is .. hilariously annoying. I have a feeling the only way you're going to
get around this for now is adding e6000sw to kld_list in /etc/rc.conf, not
loading it at boot time.

This is also going to need to be fixed for any other iflib'ed driver with an
mdiobus. :/

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