As a side note, I noticed quite some instances of that pattern (switch
statement w/ a 'default' calling BUG()) while more carefully looking at
compilation output. I may get slapped for this, but just in case this
is indeed something which deserves to be fixed and can be fixed
automagically via some semantic patch, I have CC'ed Coccinelle people.

I don't think this can be fixed in a generic way. This driver, for
example, should IMO return -EINVAL when hitting default in probe and
simply get rid of the other BUG() calls. No need to halt the kernel
because of a broken match->data.

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