detecting misuse of of_get_property

[Rasmus Villemoes]

Hi,

I just spent some time trying to convert some so far PPC-only drivers to
be more generic. One of the things I had to do was convert stuff like

  u32 *val = of_get_property(np, "bla", NULL);
  do_stuff_with(*val);

with

  of_property_read_u32(np, "bla", &val);
  do_stuff_with(val);

(error checking omitted for simplicity). The problem is that
of_get_property() just returns void*. When the property is just a
string, there's no problem interpreting that as a char*. But when the
property is a number of array of numbers, I'd like some way to flag
casting it to u32* as an error - if you cast it to a (pointer to integer
type wider than char), it must be to a __be32*. Is there some way
sparse/smatch could help find such cases?

Rasmus