Comment 8 for bug 525734

It happens often on my Sony Vaio VPCF11C5E.

It hangs while scanning wifi net and the connection to my lan is very slow, sometimes it fails.

Here the trace:

[ 2302.601112] ------------[ cut here ]------------
[ 2302.601143] WARNING: at /build/buildd/linux-2.6.32/net/mac80211/scan.c:285 ieee80211_scan_completed+0x10f/0x310 [mac80211]()
[ 2302.601149] Hardware name: VPCF11C5E
[ 2302.601151] Modules linked in: binfmt_misc rfcomm ppdev sco bridge stp bnep l2cap snd_hda_codec_nvhdmi snd_hda_codec_realtek snd_hda_intel arc4 snd_pcm_oss snd_hda_codec snd_hwdep snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event fbcon snd_seq iwlagn tileblit uvcvideo font bitblit snd_timer softcursor nvidia(P) iwlcore joydev sdhci_pci mac80211 btusb videodev snd_seq_device bluetooth v4l1_compat v4l2_compat_ioctl32 psmouse serio_raw snd sdhci led_class vga16fb vgastate cfg80211 soundcore snd_page_alloc sony_laptop video output lp parport usbhid hid ohci1394 ahci sky2 ieee1394
[ 2302.601233] Pid: 1014, comm: iwlagn Tainted: P W 2.6.32-23-generic #37-Ubuntu
[ 2302.601239] Call Trace:
[ 2302.601252] [<ffffffff81066dbb>] warn_slowpath_common+0x7b/0xc0
[ 2302.601259] [<ffffffff81066e14>] warn_slowpath_null+0x14/0x20
[ 2302.601277] [<ffffffffa01725cf>] ieee80211_scan_completed+0x10f/0x310 [mac80211]
[ 2302.601294] [<ffffffffa01d0ed0>] ? iwl_bg_scan_completed+0x0/0x90 [iwlcore]
[ 2302.601309] [<ffffffffa01d0f19>] iwl_bg_scan_completed+0x49/0x90 [iwlcore]
[ 2302.601319] [<ffffffff81080867>] run_workqueue+0xc7/0x1a0
[ 2302.601326] [<ffffffff810809e3>] worker_thread+0xa3/0x110
[ 2302.601333] [<ffffffff81085430>] ? autoremove_wake_function+0x0/0x40
[ 2302.601340] [<ffffffff81080940>] ? worker_thread+0x0/0x110
[ 2302.601346] [<ffffffff810850b6>] kthread+0x96/0xa0
[ 2302.601354] [<ffffffff810141ea>] child_rip+0xa/0x20
[ 2302.601360] [<ffffffff81085020>] ? kthread+0x0/0xa0
[ 2302.601366] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[ 2302.601370] ---[ end trace d0df1f460eba4003 ]---
[ 2302.601373] ------------[ cut here ]------------