------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/net/mac80211/scan.c:281 ieee80211_scan_completed+0xcf/0x3f0 [mac80211]()
Hardware name: MXG061                          
Modules linked in: arc4 ecb iwlagn iwlcore snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm dell_wmi joydev nvidia(P) mac80211 video iptable_filter snd_seq_dummy dell_laptop lp snd_seq_oss sdhci_pci psmouse intel_agp ip_tables x_tables output parport sdhci ricoh_mmc dcdbas snd_seq_midi serio_raw agpgart cfg80211 snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device led_class btusb snd soundcore snd_page_alloc usbhid dm_raid45 ohci1394 ieee1394 tg3 xor
Pid: 1194, comm: iwlagn Tainted: P           2.6.31-11-generic #36-Ubuntu
Call Trace:
 [<c014080d>] warn_slowpath_common+0x6d/0xa0
 [<f85d95ff>] ? ieee80211_scan_completed+0xcf/0x3f0 [mac80211]
 [<f85d95ff>] ? ieee80211_scan_completed+0xcf/0x3f0 [mac80211]
 [<c0140855>] warn_slowpath_null+0x15/0x20
 [<f85d95ff>] ieee80211_scan_completed+0xcf/0x3f0 [mac80211]
 [<c014bb25>] ? try_to_del_timer_sync+0x45/0x50
 [<f9e183e9>] iwl_bg_scan_completed+0x39/0x80 [iwlcore]
 [<c015311e>] run_workqueue+0x6e/0x140
 [<f9e183b0>] ? iwl_bg_scan_completed+0x0/0x80 [iwlcore]
 [<c0153278>] worker_thread+0x88/0xe0
 [<c0157920>] ? autoremove_wake_function+0x0/0x40
 [<c01531f0>] ? worker_thread+0x0/0xe0
 [<c015762c>] kthread+0x7c/0x90
 [<c01575b0>] ? kthread+0x0/0x90
 [<c0103f17>] kernel_thread_helper+0x7/0x10
---[ end trace 361bba3fd8aaa30f ]---