[143035.972047] ------------[ cut here ]------------
[143035.972070] WARNING: at /build/buildd/linux-2.6.31/drivers/usb/serial/usb-serial.c:412 serial_write_room+0x70/0x80 [usbserial]()
[143035.972076] Hardware name: HP Compaq nx9420 (RH439ET#AK8)
[143035.972080] Modules linked in: ircomm_tty ircomm esi_sir irtty_sir sir_dev irda pl2303 ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs ppp_deflate zlib_deflate bsd_comp ppp_async crc_ccitt option usbserial nls_utf8 isofs usb_storage bridge stp bnep ppdev vboxnetflt vboxnetadp vboxdrv binfmt_misc snd_hda_codec_analog snd_hda_intel snd_hda_codec arc4 snd_hwdep snd_pcm_oss snd_mixer_oss ecb snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi pcmcia snd_seq_midi_event iwl3945 iwlcore sdhci_pci iptable_filter sdhci ip_tables snd_seq x_tables snd_timer snd_seq_device joydev lp mac80211 hp_accel tpm_infineon tpm tpm_bios parport lis3lv02d yenta_socket psmouse rsrc_nonstatic pcmcia_core snd input_polldev serio_raw led_class tifm_7xx1 cfg80211 tifm_core soundcore btusb snd_page_alloc usbhid video tg3 output ohci1394 ieee1394 radeon ttm drm i2c_algo_bit intel_agp agpgart
[143035.972236] Pid: 0, comm: swapper Tainted: G        W  2.6.31-14-generic #48-Ubuntu
[143035.972241] Call Trace:
[143035.972254]  [<c014518d>] warn_slowpath_common+0x6d/0xa0
[143035.972267]  [<f81bf700>] ? serial_write_room+0x70/0x80 [usbserial]
[143035.972279]  [<f81bf700>] ? serial_write_room+0x70/0x80 [usbserial]
[143035.972287]  [<c01451d5>] warn_slowpath_null+0x15/0x20
[143035.972298]  [<f81bf700>] serial_write_room+0x70/0x80 [usbserial]
[143035.972306]  [<c0383ba8>] tty_write_room+0x18/0x20
[143035.972315]  [<f83415c3>] irtty_do_write+0x43/0xb0 [irtty_sir]
[143035.972327]  [<f81b14cf>] sirdev_hard_xmit+0xbf/0x280 [sir_dev]
[143035.972335]  [<c049c99d>] dev_hard_start_xmit+0x1ad/0x210
[143035.972344]  [<c04b02bc>] __qdisc_run+0x16c/0x210
[143035.972353]  [<c01338fd>] ? __enqueue_entity+0x9d/0xc0
[143035.972360]  [<c049eedf>] dev_queue_xmit+0x30f/0x440
[143035.972387]  [<faa5be20>] ? irlap_send_discovery_xid_frame+0x60/0x2d0 [irda]
[143035.972412]  [<faa5b26d>] irlap_queue_xmit+0x9d/0xe0 [irda]
[143035.972436]  [<faa5be96>] irlap_send_discovery_xid_frame+0xd6/0x2d0 [irda]
[143035.972461]  [<faa5abb8>] irlap_state_query+0x1a8/0x310 [irda]
[143035.972469]  [<c015ff63>] ? hrtimer_interrupt+0x183/0x210
[143035.972493]  [<faa5806f>] irlap_do_event+0x4f/0x180 [irda]
[143035.972517]  [<faa5d656>] irlap_slot_timer_expired+0x26/0x90 [irda]
[143035.972525]  [<c0570803>] ? _spin_lock_irq+0x13/0x20
[143035.972532]  [<c01501b7>] run_timer_softirq+0x117/0x200
[143035.972539]  [<c0103d71>] ? apic_timer_interrupt+0x31/0x40
[143035.972564]  [<faa5d630>] ? irlap_slot_timer_expired+0x0/0x90 [irda]
[143035.972572]  [<c014b3b0>] __do_softirq+0x90/0x1a0
[143035.972580]  [<c015ff63>] ? hrtimer_interrupt+0x183/0x210
[143035.972587]  [<c015fd8c>] ? ktime_get_ts+0x4c/0x60
[143035.972594]  [<c014b4fd>] do_softirq+0x3d/0x40
[143035.972600]  [<c014b63d>] irq_exit+0x5d/0x70
[143035.972607]  [<c011dcf7>] smp_apic_timer_interrupt+0x57/0x90
[143035.972614]  [<c0103d71>] apic_timer_interrupt+0x31/0x40
[143035.972621]  [<c0570920>] ? _spin_unlock_irqrestore+0x10/0x20
[143035.972629]  [<c0168bb5>] clockevents_notify+0x35/0x80
[143035.972638]  [<c0369437>] lapic_timer_state_broadcast+0x31/0x34
[143035.972646]  [<c0369b20>] acpi_idle_enter_simple+0x11b/0x130
[143035.972655]  [<c0468406>] cpuidle_idle_call+0x76/0xd0
[143035.972661]  [<c010202c>] cpu_idle+0x8c/0xd0
[143035.972670]  [<c056c096>] start_secondary+0xc6/0xc8
[143035.972675] ---[ end trace 53e7fcb5497e7460 ]---