WARNING: at /build/buildd/linux-2.6.31/net/wireless/wext-compat.c:108 cfg80211_wext_siwmode+0xef/0x120 [cfg80211]()
Hardware name: Latitude C600                   
Modules linked in: binfmt_misc snd_maestro3 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device pcmcia joydev snd yenta_socket rndis_wlan soundcore i2c_piix4 rsrc_nonstatic cfg80211 pcmcia_core iptable_filter rndis_host ppdev shpchp ip_tables psmouse cdc_ether parport_pc dell_wmi x_tables serio_raw usbnet dcdbas lp parport 3c59x mii intel_agp agpgart video output floppy
Pid: 1007, comm: wpa_supplicant Not tainted 2.6.31-16-generic #53-Ubuntu
Call Trace:
 [<c014518d>] warn_slowpath_common+0x6d/0xa0
 [<d0b9807f>] ? cfg80211_wext_siwmode+0xef/0x120 [cfg80211]
 [<d0b9807f>] ? cfg80211_wext_siwmode+0xef/0x120 [cfg80211]
 [<c01451d5>] warn_slowpath_null+0x15/0x20
 [<d0b9807f>] cfg80211_wext_siwmode+0xef/0x120 [cfg80211]
 [<c0555d08>] ioctl_standard_call+0x58/0xf0
 [<c0555e5a>] T.788+0xba/0x140
 [<d0b97f90>] ? cfg80211_wext_siwmode+0x0/0x120 [cfg80211]
 [<c0555f29>] T.789+0x49/0x80
 [<c0555f8a>] wext_handle_ioctl+0x2a/0x70
 [<c049e319>] dev_ioctl+0x249/0x250
 [<c048ddbb>] sock_ioctl+0x1cb/0x260
 [<c0570e3a>] ? _spin_lock_irqsave+0x2a/0x40
 [<c048dbf0>] ? sock_ioctl+0x0/0x260
 [<c01f518c>] vfs_ioctl+0x1c/0x90
 [<c01919f6>] ? handle_level_irq+0xa6/0xe0
 [<c01f54b1>] do_vfs_ioctl+0x71/0x310
 [<c014b60f>] ? irq_exit+0x2f/0x70
 [<c01f57af>] sys_ioctl+0x5f/0x80
 [<c010336c>] syscall_call+0x7/0xb
---[ end trace 3ae5ce169945c399 ]---