卸载驱动的问题

编写了个驱动成功加载后卸载rmmod时 显示
ERROR: Removing 'raider': Device or resource busy


dmesg | tail查看
[13015.706551] e89e9180 d1479fb0 c0160a9f e89e960c 64696172 cc007265 d1479f9c c01a2d65
[13015.706563] ffffffff b7ef0000 b7ef0000 00000000 cc909a80 e795ed1c cc909a84 00001000
[13015.706576] e795ef20 e795ee18 00909a80 e89e9600 00000880 d1479fa0 00000000 bf80f870
[13015.706589] Call Trace:
[13015.706594] [<c0160a9f>] ? sys_delete_module+0x15f/0x220
[13015.706605] [<c01a2d65>] ? do_munmap+0x225/0x280
[13015.706616] [<c0103eeb>] ? sysenter_do_call+0x12/0x2f
[13015.706625] Code: <89> 82 9c 00 00 00 c9 c3 8d 76 00 55 89 e5 83 ec 04 c7 04 24 8f 91
[13015.706651] EIP: [<e89e9025>] cleanup_module+0x25/0x30 [raider] SS:ESP 0068:d1479f48
[13015.706664] ---[ end trace b4a73dd25a8b124a ]---

应该是主设备号被用啦，换个试试