- A more uniform poll queueing interface with tips from Manfred

- The f_op->poll() is done outside the irqlock to maintain compatibility
	with existing drivers that assume to be called with irq enabled

- Moved event mask setting inside ep_modify() with tips from John

- Fixed locking to fit the new "poll() outside the lock" approach

- Bufferd userspace event delivery to reduce irq_lock/irq_unlock switching
	rate and to reduce the number of __copy_to_user()

- Comments added