On Tue, Sep 09, 2014 at 10:10:59AM +0900, Tejun Heo wrote:

* Identify cases which can't be asynchronous and make them
  synchronous.  e.g. keep who's doing request_module() and avoid
  asynchronous probing if current is probing one of those.

That wouldn't work as we don't know what's gonna happen in userland
but we can start with just disallowing async probing for char devices
for now.

Thanks.

-- 
tejun