Hi, I am wondering, that the struct subsystem uses a struct rw_semaphore for locking. Consequently the use of kobject_un/register() is prohibited in interrupt context (because rwsem can block); is this not to restricted? /FAU -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/