Routes to a device being taken down might be deleted by ax25_rt_device_down
but added by somebody else before the device has been deleted fully.
-Massive amounts of lock_kernel / unlock_kernel are just a temporary solution to
-get around the removal of SOCKOPS_WRAP. A serious locking strategy has to be
-implemented.
-
The ax25_rt_find_route synopsys is pervert but I somehow had to deal with
the race caused by the static variable in it's previous implementation.