------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/fs/sysfs/dir.c:451 sysfs_add_one+0xa1/0x110()
Hardware name: N150/N210/N220             
sysfs: cannot create duplicate filename '/dev/char/81:2'
Modules linked in: webcamstudio(+) binfmt_misc rfcomm parport_pc ppdev sco bnep l2cap vboxnetadp vboxnetflt vboxdrv snd_hda_codec_realtek snd_hda_intel arc4 snd_hda_codec snd_hwdep ath9k snd_pcm i915 ath9k_common snd_seq_midi ath9k_hw snd_rawmidi ath snd_seq_midi_event mac80211 drm_kms_helper snd_seq drm snd_timer snd_seq_device btusb uvcvideo bluetooth cfg80211 intel_agp videodev joydev snd psmouse v4l1_compat serio_raw i2c_algo_bit video led_class soundcore snd_page_alloc agpgart output lp parport usbhid hid ahci libahci sky2
Pid: 1795, comm: v4l_id Tainted: G        W   2.6.35-19-generic #26-Ubuntu
Call Trace:
 [<c014a812>] warn_slowpath_common+0x72/0xa0
 [<c0271171>] ? sysfs_add_one+0xa1/0x110
 [<c0271171>] ? sysfs_add_one+0xa1/0x110
 [<c014a8e3>] warn_slowpath_fmt+0x33/0x40
 [<c0271171>] sysfs_add_one+0xa1/0x110
 [<c0271859>] sysfs_do_create_link+0xf9/0x1d0
 [<c0271967>] sysfs_create_link+0x17/0x20
 [<c03fdaaf>] device_add+0x19f/0x3b0
 [<c0405cfd>] ? device_pm_init+0x2d/0x30
 [<c03fdcd7>] device_register+0x17/0x20
 [<f840e718>] __video_register_device+0x2a8/0x4a0 [videodev]
 [<f840e947>] video_register_device+0x17/0x20 [videodev]
 [<f83d9bfc>] create_pipe+0x3fc/0x5c0 [webcamstudio]
 [<f83d9f35>] webcamstudio_open+0x175/0x1f8 [webcamstudio]
 [<c0351832>] ? kobject_get+0x12/0x20
 [<f840e437>] v4l2_open+0x67/0xa0 [videodev]
 [<c021ba3d>] chrdev_open+0xcd/0x1c0
 [<c0216794>] __dentry_open+0xc4/0x280
 [<c0216a39>] nameidata_to_filp+0x59/0x70
 [<c021b970>] ? chrdev_open+0x0/0x1c0
 [<c0221d4f>] finish_open+0xbf/0x1a0
 [<c022aa81>] ? dput+0x91/0x130
 [<c0222ef6>] do_last+0x66/0x3a0
 [<c0224c7d>] do_filp_open+0x19d/0x4c0
 [<c0216525>] do_sys_open+0x55/0x150
 [<c021668e>] sys_open+0x2e/0x40
 [<c05c8364>] syscall_call+0x7/0xb
---[ end trace 001beb393beeed24 ]---