Panic 7.0 BETA-3 (page fault) using D-Link DWL-G122

Hello everyone
I'm tracking RELENG_7 (i386, SCHED_SMP, last build: today, 2 dec) on my
laptop (core 2 duo) and I've recently bought an usb wireless adapter
(D-Link DWL-G122 rev C1). 
Everything works properly (i can connect to the access point using WPA
and do normal network activities) but sometimes (I must say, randomly) I
get a kernel panic. 

Here's the debug info, hope it helps:

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x12
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc06b976a
stack pointer         = 0x28:0xe296cbe4
frame pointer         = 0x28:0xe296cbfc
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 24 (irq23: uhci0 ehci0)
trap number = 12
panic: page fault
cpuid = 1
Uptime: 3m44s
Physical memory: 1009 MB
Dumping 107 MB: 92 76 60 44 28 12

Backtrace
#0  doadump () at pcpu.h:195
#1  0xc0752e07 in boot (howto=260)
at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc07530c9 in panic (fmt=) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc0a184fc in trap_fatal (frame=0xe296cba4, eva=18)
    at /usr/src/sys/i386/i386/trap.c:872
#4  0xc0a18760 in trap_pfault (frame=0xe296cba4, usermode=0, eva=18)
    at /usr/src/sys/i386/i386/trap.c:785
#5  0xc0a190b2 in trap (frame=0xe296cba4)
at /usr/src/sys/i386/i386/trap.c:463
#6  0xc09ffacb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc06b976a in rum_txeof (xfer=0xc4343800, priv=0xc40a7498, 
    status=USBD_NORMAL_COMPLETION) at /usr/src/sys/dev/usb/if_rum.c:842
#8  0xc06d2fa5 in usb_transfer_complete (xfer=0xc4343800)
    at /usr/src/sys/dev/usb/usbdi.c:977
#9  0xc06a5ba1 in ehci_softintr (v=0xc3fe5800)
    at /usr/src/sys/dev/usb/ehci.c:884
#10 0xc06ceb52 in usb_schedsoftintr (bus=0xc3fe5800)
    at /usr/src/sys/dev/usb/usb.c:844
#11 0xc06a737e in ehci_intr1 (sc=0xc3fe5800)
    at /usr/src/sys/dev/usb/ehci.c:603
#12 0xc06a7db5 in ehci_intr (v=0xc3fe5800)
at /usr/src/sys/dev/usb/ehci.c:562
#13 0xc07366cb in ithread_loop (arg=0xc4057b00)
    at /usr/src/sys/kern/kern_intr.c:1036
#14 0xc0733609 in fork_exit (callout=0xc0736520 <ithread_loop>, 
    arg=0xc4057b00, frame=0xe296cd38)
at /usr/src/sys/kern/kern_fork.c:754
#15 0xc09ffb40 in fork_trampoline ()
at /usr/src/sys/i386/i386/exception.s:205

Thanks,
Leonardo