3.1.0-rc3 -- WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0x92/0xa6()

[Miles Lane]

WARNING: at fs/sysfs/dir.c:455 sysfs_add_one+0x92/0xa6()
Hardware name: UL50VT
sysfs: cannot create duplicate filename
'/devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight'
Modules linked in:
Pid: 1, comm: swapper Not tainted 3.1.0-rc3 #2
Call Trace:
 [<ffffffff81039084>] warn_slowpath_common+0x7e/0x96
 [<ffffffff81039130>] warn_slowpath_fmt+0x41/0x43
 [<ffffffff81149f45>] sysfs_add_one+0x92/0xa6
 [<ffffffff81149fc8>] create_dir+0x6f/0xa8
 [<ffffffff8114a0a8>] sysfs_create_dir+0x8b/0xa2
 [<ffffffff811f9478>] kobject_add_internal+0xcb/0x18c
 [<ffffffff811f9872>] kobject_add+0x91/0xa2
 [<ffffffff812d5cf4>] device_add+0xc9/0x56b
 [<ffffffff81207524>] ? __raw_spin_lock_init+0x31/0x52
 [<ffffffff812d61ad>] device_register+0x17/0x1c
 [<ffffffff81230934>] backlight_device_register+0x10a/0x17a
 [<ffffffff812c96d8>] intel_panel_setup_backlight+0x78/0xcd
 [<ffffffff812bf062>] intel_modeset_init+0xd5d/0xe5f
 [<ffffffff8129da2c>] i915_driver_load+0x8d8/0xdb0
 [<ffffffff812d61ad>] ? device_register+0x17/0x1c
 [<ffffffff8128ee0a>] drm_get_pci_dev+0x16b/0x267
 [<ffffffff813fbbba>] i915_pci_probe+0x1b/0x1d
 [<ffffffff812169bf>] pci_device_probe+0x57/0x82
 [<ffffffff812d7e16>] ? driver_sysfs_add+0x6b/0x90
 [<ffffffff812d802c>] driver_probe_device+0xa5/0x135
 [<ffffffff812d8115>] __driver_attach+0x59/0x7c
 [<ffffffff812d80bc>] ? driver_probe_device+0x135/0x135
 [<ffffffff812d72bf>] bus_for_each_dev+0x54/0x88
 [<ffffffff812d7d24>] driver_attach+0x19/0x1b
 [<ffffffff812d79a6>] bus_add_driver+0xab/0x201
 [<ffffffff812d8567>] driver_register+0x93/0x100
 [<ffffffff812171ff>] __pci_register_driver+0x61/0xce
 [<ffffffff8128ef86>] drm_pci_init+0x80/0xe5
 [<ffffffff81ad8aeb>] ? drm_core_init+0x128/0x128
 [<ffffffff81ad8b76>] i915_init+0x8b/0x8d
 [<ffffffff8100020a>] do_one_initcall+0x7a/0x130
 [<ffffffff81ab2ba6>] kernel_init+0x9b/0x115
 [<ffffffff814184b4>] kernel_thread_helper+0x4/0x10
 [<ffffffff81410c21>] ? retint_restore_args+0xe/0xe
 [<ffffffff81ab2b0b>] ? start_kernel+0x392/0x392
 [<ffffffff814184b0>] ? gs_change+0xb/0xb
---[ end trace 45a7fa691fcd0399 ]---
kobject_add_internal failed for intel_backlight with -EEXIST, don't
try to register things with the same name in the same directory.
Pid: 1, comm: swapper Tainted: G        W   3.1.0-rc3 #2
Call Trace:
 [<ffffffff811f9509>] kobject_add_internal+0x15c/0x18c
 [<ffffffff811f9872>] kobject_add+0x91/0xa2
 [<ffffffff812d5cf4>] device_add+0xc9/0x56b
 [<ffffffff81207524>] ? __raw_spin_lock_init+0x31/0x52
 [<ffffffff812d61ad>] device_register+0x17/0x1c
 [<ffffffff81230934>] backlight_device_register+0x10a/0x17a
 [<ffffffff812c96d8>] intel_panel_setup_backlight+0x78/0xcd
 [<ffffffff812bf062>] intel_modeset_init+0xd5d/0xe5f
 [<ffffffff8129da2c>] i915_driver_load+0x8d8/0xdb0
 [<ffffffff812d61ad>] ? device_register+0x17/0x1c
 [<ffffffff8128ee0a>] drm_get_pci_dev+0x16b/0x267
 [<ffffffff813fbbba>] i915_pci_probe+0x1b/0x1d
 [<ffffffff812169bf>] pci_device_probe+0x57/0x82
 [<ffffffff812d7e16>] ? driver_sysfs_add+0x6b/0x90
 [<ffffffff812d802c>] driver_probe_device+0xa5/0x135
 [<ffffffff812d8115>] __driver_attach+0x59/0x7c
 [<ffffffff812d80bc>] ? driver_probe_device+0x135/0x135
 [<ffffffff812d72bf>] bus_for_each_dev+0x54/0x88
 [<ffffffff812d7d24>] driver_attach+0x19/0x1b
 [<ffffffff812d79a6>] bus_add_driver+0xab/0x201
 [<ffffffff812d8567>] driver_register+0x93/0x100
 [<ffffffff812171ff>] __pci_register_driver+0x61/0xce
 [<ffffffff8128ef86>] drm_pci_init+0x80/0xe5
 [<ffffffff81ad8aeb>] ? drm_core_init+0x128/0x128
 [<ffffffff81ad8b76>] i915_init+0x8b/0x8d
 [<ffffffff8100020a>] do_one_initcall+0x7a/0x130
 [<ffffffff81ab2ba6>] kernel_init+0x9b/0x115
 [<ffffffff814184b4>] kernel_thread_helper+0x4/0x10
 [<ffffffff81410c21>] ? retint_restore_args+0xe/0xe
 [<ffffffff81ab2b0b>] ? start_kernel+0x392/0x392
 [<ffffffff814184b0>] ? gs_change+0xb/0xb
[drm:intel_panel_setup_backlight] *ERROR* Failed to register backlight: -17
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