kernel panic reboot from ath0 trying to use adhoc mode

I have a VAIO AR270 running 8.1-RELEASE, using a D-link WNA-2330 card (Atheros AR5212 chip).
After configuring the device with:
Code:
ifconfig wlan0 create wlandev ath0 wlanmode adhoc
ifconfig wlan0 inet 192.168.19.2 netmask 255.255.255.0 ssid my_ssid
when I try to connect a device (iPhone) to the network, I get:
Code:
Fatal trap 12:  page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual addrss     = 0x8
fault code               = supervisor read, page not present
instruction pointer      = 0x20:0xc059f22f
stack pointer            = 0x28:0xe606bb84
frame pointer            = 0x28:0xe606bbb0
code segment             = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def 32 1, gran 1
processor eflags         = interrupt enabled, resume, IOPL = 0
current process          = 0 (ath0 taskq)
trap number              = 12
panic:  page fault
cpuid = 1
Uptime: 7m46s
Cannot dump. Device not defined or unavailable.
Automatic reboot in 15 seconds - pres a key on the console to abort.

The bug in the link below is almost identical behaviour, except the crash occurs sooner. Could be because he already had the other device started when doing ifconfig:

http://www.freebsd.org/cgi/query-pr.cgi?pr=145826

Am I missing something or am I just out of luck?
 
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