[BUG] act_ife: sleeping functions called in atomic context

[Alexey Khoroshilov]

tcf_ife_init() contains a big chunk of code executed with
ife->tcf_lock spinlock held. But that code contains several calls
to sleeping functions:
  populate_metalist() and use_all_metadata()
    -> add_metainfo()
      -> find_ife_oplist(metaid)
        -> read_lock()
        -> try_module_get(o->owner)
      -> kzalloc(sizeof(*mi), GFP_KERNEL);
      -> ops->alloc(mi, metaval);
      -> module_put(ops->owner);
  _tcf_ife_cleanup()
    -> module_put()

The same problem is actual for tcf_ife_cleanup() as well.

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS
web: http://linuxtesting.org