I have a MacBook 3,1 and after a update to 12.2 from 12.1
Info from lspci:
02:00.0 Network Controller: Broadcom Corporation BCM4321 802.11a/b/g/n
Info from iwlist scan:
http://pastebin.com/RQ5zwYzH
If I can provide more information to help, please tell me. Thanks.