[PATCH v5 18/34] cxlflash: Fix AFU version access/storage and add check

[Daniel Axtens]

"Matthew R. Ochs" <mrochs at linux.vnet.ibm.com> writes:

> Correct, downlevel (unsupported) AFUs don't implement the interface_version
> register and thus will return -1 at that offset.
Cool. It would be good to document that somewhere, either the comment or
the commit message, but it's not worth holding up the series for it.

I also tend to use the form (var == ~0ULL) for tests like this but
that's an aesthetic thing.

Reviewed-by: Daniel Axtens <dja at axtens.net>

Regards,
Daniel
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