很急!xscale下安装驱动问题

fengqd

板子系统是arm-gcc4.1编译的,我用cross3.4.4编译的应用程序可以运行,编译的驱动模块可以加载,但一插入设备后就出错:Unable to handle kernel NULL pointer dereference at virtual address 00000118
pgd = c0004000
[00000118] *pgd=00000000
Internal error: Oops: 17 [#1]
Modules linked in: pwc videodev compat_ioctl32 v4l2_common v4l1_compat rfcomm l2cap bluetooth pcmcia pxa2xx_cs pxa2xx_core pcmcia_core 8139too
CPU: 0
        Not tainted  (2.6.24-cm-x270 #2)
PC is at usb_pwc_probe+0x28/0x950 [pwc]
LR is at usb_probe_interface+0xc4/0x110
pc : [<bf050748>]
        lr : [<c01bdf84>]
                psr: a0000013
sp : c7cd1c90  ip : c7cd1ce0  fp : c7cd1cdc
r10: c031c65c  r9 : ffffffa4  r8 : 00000000
r7 : bf062bf0  r6 : bf062c20  r5 : c7485a00  r4 : c7485a20
r3 : 00000174  r2 : 00000000  r1 : 00000000  r0 : c7485a00
请问是什么问题.