I've just sent two patches which do solve this problem for review to Linux kernel mailing list. Description of the problem: http://marc.info/?l=linux-kernel&m=123055968113465&w=2 Two patches: http://marc.info/?l=linux-kernel&m=123055978413612&w=2 http://marc.info/?l=linux-kernel&m=123055986413742&w=2