airmon-ng stop <interface name> ?
Or modprobe -r <driver name> and afterwards a modprobe <driver name>?
You may need a ifconfig <interface name> down before the modprobe -r
Maybe:
Found this thread too: http://forums.remote-exploit.org/showthread.php?t=17358wlanconfig ath0 destroy
ifconfig wifi0 down
ifconfig ath0 down
wlanconfig ath0 create wlandev wifi0 wlanmode managed
ifconfig ath0 up
ifconfig wifi0 up



