On Sun, 22 Apr 2012, Anil Nair wrote: > The port number comes from root hub managed by the host controller. Its > fixed dynamically during enumeration, and can change. > Please correct me if i am wrong. You are indeed wrong. Port numbers are not fixed dynamically and they cannot change. On the other hand, bus numbers _are_ assigned dynamically and they can (and do) change. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html