[openib-general] hotplug support in mthca

[Roland Dreier]

    Michael> How about fixing it by blocking remove_one in uverbs
    Michael> until all contexts are closed and device refcount drops
    Michael> to 0?

That seems kind of horrible, because there's no guarantee that all the
contexts will ever be freed.

I think the real answer is to revoke all the contexts that userspace
has.  But that doesn't seem trivial to do, which is why I haven't
implemented it yet.

 - R.