atheros panic (D-Link DWL-G520)

My device is D-Link DWL-G520 and the device encountered a panic when I
did `ifconfig ath0 up'.  The kernel was cvs-uped yesterday. The following
are the panic message:

hostap# ifconfig ath0 up
ath0: ath_chan_set: unable to reset channel 1 (2412 Mhz, flags 0x480 hal
flags 0xc0)
hostap# ath0: ath_chan_set: unable to reset channel 11 (2462 Mhz, flags
0x480 hal flags 0xc0)
ath0: ath_chan_set: unable to reset channel 13 (2472 Mhz, flags 0x480
hal flags 0xc0)
ath0: ath_chan_set: unable to reset channel 3 (2422 Mhz, flags 0x480 hal
flags 0xc0)
ath0: ath_chan_set: unable to reset channel 8 (2447 Mhz, flags 0x480 hal
flags 0xc0)
ath0: hardware error; resetting
ath0: 0x00080000 0x00000000 0x00000000, 0x00010000 0x00000000 0x00000000


Fatal trap 18: integer divide fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x20:0xc09f0d25
stack pointer           = 0x28:0xcbd3acd8
frame pointer           = 0x28:0xcbd3acd8
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, IOPL = 0
current process         = 11 (idle: cpu0)
[thread pid 11 tid 100004 ]
Stopped at      cpu_idle_default+0x5:   popl    %ebp
db> bt
Tracing pid 11 tid 100004 td 0xc20f7630
cpu_idle_default(cbd3acf8,c0769e17,c0bad610,2,c0a9a19d,...) at
cpu_idle_default+0x5
cpu_idle(c0bad610,2,c0a9a19d,562,cbd3ad24,...) at cpu_idle+0x28
sched_idletd(0,cbd3ad38,c0a9515d,314,c20f6aa0,...) at sched_idletd+0x37
fork_exit(c0769de0,0,cbd3ad38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xcbd3ad70, ebp = 0 ---
db>


And the below informations are device informations:

hostap# uname -a
FreeBSD hostap 7.0-CURRENT FreeBSD 7.0-CURRENT #1: Thu Sep 27 02:43:04
KST 2007     root_at_rumhostap:/usr/obj/usr/src/sys/GENERIC  i386

hostap# pciconf -lcv
ath0_at_pci2:2:0:  class=0x020000 card=0x3a131186 chip=0x0013168c rev=0x01
hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = 'AR5212, AR5213 802.11a/b/g Wireless Adapter'
    class      = network
    subclass   = ethernet
    cap 01[44] = powerspec 2  supports D0 D3  current D0

hostap# sysctl -a | grep dev.ath.0
dev.ath.0.%desc: Atheros 5212
dev.ath.0.%driver: ath
dev.ath.0.%location: slot=2 function=0
dev.ath.0.%pnpinfo: vendor=0x168c device=0x0013 subvendor=0x1186
subdevice=0x3a13 class=0x020000
dev.ath.0.%parent: pci2
dev.ath.0.smoothing_rate: 95
dev.ath.0.sample_rate: 10
dev.ath.0.countrycode: 0
dev.ath.0.regdomain: 48
dev.ath.0.slottime: 9
dev.ath.0.acktimeout: 96
dev.ath.0.ctstimeout: 96
dev.ath.0.softled: 0
dev.ath.0.ledpin: 0
dev.ath.0.ledon: 0
dev.ath.0.ledidle: 2700
dev.ath.0.txantenna: 0
dev.ath.0.rxantenna: 0
dev.ath.0.diversity: 0
dev.ath.0.txintrperiod: 5
dev.ath.0.diag: 0
dev.ath.0.tpscale: 0
dev.ath.0.tpc: 0
dev.ath.0.tpack: 63
dev.ath.0.tpcts: 63
dev.ath.0.fftxqmin: 2
dev.ath.0.fftxqmax: 50
dev.ath.0.monpass: 24

hostap# ifconfig ath0 list channel
Channel   1 : 2412  Mhz 11g          Channel   8 : 2447  Mhz 11g          
Channel   2 : 2417  Mhz 11g          Channel   9 : 2452  Mhz 11g          
Channel   3 : 2422  Mhz 11g          Channel  10 : 2457  Mhz 11g          
Channel   4 : 2427  Mhz 11g          Channel  11 : 2462  Mhz 11g          
Channel   5 : 2432  Mhz 11g          Channel  12 : 2467  Mhz 11g          
Channel   6 : 2437  Mhz 11g Turbo    Channel  13 : 2472  Mhz 11g          
Channel   7 : 2442  Mhz 11g          

stap# /sbin/ifconfig 
ath0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:1b:11:1a:ee:32
        media: IEEE 802.11 Wireless Ethernet autoselect (autoselect)
        status: no carrier
        ssid "" channel 1 (2412 Mhz 11b)
        authmode OPEN privacy OFF txpowmax 100 bmiss 7 scanvalid 60 bgscan
        bgscanintvl 300 bgscanidle 250 roam:rssi11b 14 roam:rate11b 1 burst

hostap# dmesg | grep -i ath
ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
ath0: <Atheros 5212> mem 0xe7000000-0xe700ffff irq 11 at device 2.0 on pci2
ath0: [ITHREAD]
ath0: using obsoleted if_watchdog interface
ath0: Ethernet address: 00:1b:11:1a:ee:32
ath0: mac 7.9 phy 4.5 radio 5.6