Public bug reported:

Suddenly got this warning in dmesg:
Mar  4 23:08:39 laptop-jl kernel: [19951.767731] ------------[ cut here 
]------------
Mar  4 23:08:39 laptop-jl kernel: [19951.767751] WARNING: at 
/build/buildd/linux-3.2.0/fs/sysfs/inode.c:323 sysfs_hash_and_remove+0xa9/0xb0()
Mar  4 23:08:39 laptop-jl kernel: [19951.767759] Hardware name: Dell System XPS 
L502X
Mar  4 23:08:39 laptop-jl kernel: [19951.767764] sysfs: can not remove 'bsg', 
no directory
Mar  4 23:08:39 laptop-jl kernel: [19951.767769] Modules linked in: xfs ses 
enclosure dm_crypt nls_iso8859_1 nls_cp437 vfat fat usb_storage ip6table_filter 
ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM 
iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp 
bbswitch(O) bnep rfcomm parport_pc ppdev nfsd nfs binfmt_misc lockd fscache 
auth_rpcgss nfs_acl sunrpc snd_hda_codec_hdmi snd_hda_codec_realtek joydev arc4 
dell_wmi sparse_keymap cdc_ether cdc_wdm usbnet cdc_acm snd_hda_intel 
snd_hda_codec snd_hwdep dell_laptop dcdbas snd_pcm snd_seq_midi snd_rawmidi 
snd_seq_midi_event btusb bluetooth snd_seq uvcvideo psmouse videodev serio_raw 
v4l2_compat_ioctl32 snd_timer snd_seq_device iwlwifi snd mac80211 cfg80211 
soundcore snd_page_alloc ttm mxm_wmi wmi i915 drm_kms_helper mei(C) drm mac_hid 
i2c_algo_bit video lp parport usbhid hid r8169 [last unloaded: nouveau]
Mar  4 23:08:39 laptop-jl kernel: [19951.767986] Pid: 47, comm: khubd Tainted: 
G        WC O 3.2.0-17-generic #27-Ubuntu
Mar  4 23:08:39 laptop-jl kernel: [19951.767993] Call Trace:
Mar  4 23:08:39 laptop-jl kernel: [19951.768012]  [<ffffffff8106723f>] 
warn_slowpath_common+0x7f/0xc0
Mar  4 23:08:39 laptop-jl kernel: [19951.768024]  [<ffffffff81067336>] 
warn_slowpath_fmt+0x46/0x50
Mar  4 23:08:39 laptop-jl kernel: [19951.768035]  [<ffffffff811ea869>] 
sysfs_hash_and_remove+0xa9/0xb0
Mar  4 23:08:39 laptop-jl kernel: [19951.768048]  [<ffffffff811ecf66>] 
sysfs_remove_link+0x26/0x30
Mar  4 23:08:39 laptop-jl kernel: [19951.768062]  [<ffffffff812fa13c>] 
bsg_unregister_queue+0x4c/0x90
Mar  4 23:08:39 laptop-jl kernel: [19951.768078]  [<ffffffff8142b4d9>] 
__scsi_remove_device+0xa9/0xd0
Mar  4 23:08:39 laptop-jl kernel: [19951.768089]  [<ffffffff81429e64>] 
scsi_forget_host+0x64/0x70
Mar  4 23:08:39 laptop-jl kernel: [19951.768103]  [<ffffffff8141f05f>] 
scsi_remove_host+0x6f/0x120
Mar  4 23:08:39 laptop-jl kernel: [19951.768122]  [<ffffffffa021a72d>] 
quiesce_and_remove_host+0x6d/0xc0 [usb_storage]
Mar  4 23:08:39 laptop-jl kernel: [19951.768138]  [<ffffffffa021a7a2>] 
usb_stor_disconnect+0x22/0x40 [usb_storage]
Mar  4 23:08:39 laptop-jl kernel: [19951.768153]  [<ffffffff81494a82>] 
usb_unbind_interface+0x52/0x180
Mar  4 23:08:39 laptop-jl kernel: [19951.768168]  [<ffffffff813f1afc>] 
__device_release_driver+0x7c/0xe0
Mar  4 23:08:39 laptop-jl kernel: [19951.768180]  [<ffffffff813f1b8c>] 
device_release_driver+0x2c/0x40
Mar  4 23:08:39 laptop-jl kernel: [19951.768192]  [<ffffffff813f1638>] 
bus_remove_device+0x78/0xb0
Mar  4 23:08:39 laptop-jl kernel: [19951.768203]  [<ffffffff813eec0d>] 
device_del+0x12d/0x1b0
Mar  4 23:08:39 laptop-jl kernel: [19951.768214]  [<ffffffff814927af>] 
usb_disable_device+0xaf/0x1d0
Mar  4 23:08:39 laptop-jl kernel: [19951.768227]  [<ffffffff8148b4e8>] 
usb_disconnect+0x98/0x140
Mar  4 23:08:39 laptop-jl kernel: [19951.768241]  [<ffffffff8148c350>] 
hub_port_connect_change+0xa0/0x6e0
Mar  4 23:08:39 laptop-jl kernel: [19951.768254]  [<ffffffff81489a7a>] ? 
hub_port_finish_reset.isra.17+0x6a/0x140
Mar  4 23:08:39 laptop-jl kernel: [19951.768267]  [<ffffffff8148ce54>] 
hub_events+0x4c4/0x620
Mar  4 23:08:39 laptop-jl kernel: [19951.768282]  [<ffffffff816566bc>] ? 
__schedule+0x3cc/0x6f0
Mar  4 23:08:39 laptop-jl kernel: [19951.768295]  [<ffffffff8148cfe5>] 
hub_thread+0x35/0x180
Mar  4 23:08:39 laptop-jl kernel: [19951.768303]  [<ffffffff8108ae20>] ? 
add_wait_queue+0x60/0x60
Mar  4 23:08:39 laptop-jl kernel: [19951.768312]  [<ffffffff8148cfb0>] ? 
hub_events+0x620/0x620
Mar  4 23:08:39 laptop-jl kernel: [19951.768319]  [<ffffffff8108a38c>] 
kthread+0x8c/0xa0
Mar  4 23:08:39 laptop-jl kernel: [19951.768329]  [<ffffffff81663374>] 
kernel_thread_helper+0x4/0x10
Mar  4 23:08:39 laptop-jl kernel: [19951.768337]  [<ffffffff8108a300>] ? 
flush_kthread_worker+0xa0/0xa0
Mar  4 23:08:39 laptop-jl kernel: [19951.768345]  [<ffffffff81663370>] ? 
gs_change+0x13/0x13
Mar  4 23:08:39 laptop-jl kernel: [19951.768350] ---[ end trace 
3cfa9e8ed85c7a33 ]---

There is already a fix for this in kernel GIT:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commitdiff;h=37b40adf2d1b4a5e51323be73ccf8ddcf3f15dd3

Could this be applied in Precise kernel?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Triaged

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https://bugs.launchpad.net/bugs/946928

Title:
  sysfs: can not remove 'bsg', no directory

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