------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/drivers/usb/serial/usb-serial.c:422 serial_unthrottle+0x77/0x80()
Hardware name: To Be Filled By O.E.M.
Modules linked in: isofs udf crc_itu_t binfmt_misc ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel kvm coretemp lp snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm hostap_pci snd_seq_dummy hostap snd_seq_oss lib80211 snd_seq_midi snd_rawmidi orinoco_pci orinoco heci(C) snd_seq_midi_event snd_seq snd_timer snd_seq_device psmouse ppdev shpchp serio_raw snd pl2303 pcspkr soundcore snd_page_alloc parport_pc parport ohci1394 ieee1394 usbhid floppy e1000e fbcon tileblit font bitblit softcursor i915 drm i2c_algo_bit video output intel_agp agpgart
Pid: 2137, comm: minicom Tainted: G         C 2.6.31-3-generic #19-Ubuntu
Call Trace:
 [<c013fb4d>] warn_slowpath_common+0x6d/0xa0
 [<c0429547>] ? serial_unthrottle+0x77/0x80
 [<c0429547>] ? serial_unthrottle+0x77/0x80
 [<c013fb95>] warn_slowpath_null+0x15/0x20
 [<c0429547>] serial_unthrottle+0x77/0x80
 [<c039b95f>] ? put_device+0xf/0x20
 [<c0574b14>] ? mutex_lock+0x14/0x40
 [<c03801f6>] tty_unthrottle+0x36/0x50
 [<c037e2d9>] reset_buffer_flags+0xb9/0xe0
 [<c037e316>] n_tty_flush_buffer+0x16/0x80
 [<c0381667>] tty_ldisc_flush+0x27/0x40
 [<c038268b>] tty_port_close_end+0x1b/0xe0
 [<c0429fc7>] serial_close+0x47/0x90
 [<c0379c1e>] ? tty_fasync+0x3e/0x120
 [<c037b850>] tty_release_dev+0x120/0x500
 [<f8ea08cb>] ? set_control_lines+0x4b/0x90 [pl2303]
 [<f8ea0980>] ? pl2303_tiocmset+0x0/0xc0 [pl2303]
 [<c042935a>] ? serial_tiocmset+0x4a/0xa0
 [<c0381622>] ? tty_ldisc_deref+0x52/0x70
 [<c037c0d8>] ? tty_ioctl+0x318/0x620
 [<c037bc42>] tty_release+0x12/0x20
 [<c01e266a>] __fput+0xda/0x1f0
 [<c01e2795>] fput+0x15/0x20
 [<c01def67>] filp_close+0x47/0x70
 [<c01df003>] sys_close+0x73/0xb0