WARNING at lib/kref.c:32 kref_get()
 [<c02086c0>] kref_get+0x40/0x50
 [<c02079bf>] kobject_get+0xf/0x20
 [<c0288e7e>] get_driver+0xe/0x20
 [<c0288ea3>] driver_remove_file+0x13/0x40
 [<f8db997f>] ipw_exit+0xf/0x19 [ipw3945]
 [<c013b0e8>] sys_delete_module+0x148/0x1b0
 [<c0155e11>] remove_vma+0x41/0x50
 [<c0156877>] do_munmap+0x197/0x1f0
 [<c0102faa>] sysenter_past_esp+0x5f/0x85
 [<c0380033>] ieee80211_alloc_txb+0x43/0xe0
 =======================