------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/lib/kref.c:34 kref_get+0x2d/0x30()
Hardware name: HP EliteBook 2540p
Modules linked in: rfcomm sco bnep l2cap btusb bluetooth aesni_intel cryptd aes_x86_64 aes_generic parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_idt pata_pcmcia binfmt_misc arc4 snd_hda_intel tpm_infineon snd_hda_codec snd_hwdep iwlagn snd_pcm i915 xfs pcmcia iwlcore exportfs mac80211 snd_seq_midi joydev snd_rawmidi drm_kms_helper snd_seq_midi_event drm cfg80211 hp_wmi snd_seq sparse_keymap uvcvideo yenta_socket psmouse i2c_algo_bit videodev hp_accel pcmcia_rsrc snd_timer snd_seq_device pcmcia_core snd tpm_tis v4l2_compat_ioctl32 tpm lis3lv02d serio_raw intel_ips soundcore snd_page_alloc tpm_bios lp video input_polldev parport firewire_ohci firewire_core sdhci_pci crc_itu_t ahci sdhci e1000e libahci
Pid: 13241, comm: pm-suspend Not tainted 2.6.38-8-generic #42-Ubuntu
Call Trace:
 [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
 [<ffffffff81065d4a>] ? warn_slowpath_null+0x1a/0x20
 [<ffffffff812de3bd>] ? kref_get+0x2d/0x30
 [<ffffffff812dcc4a>] ? kobject_get+0x1a/0x30
 [<ffffffff813b66f9>] ? get_device+0x19/0x20
 [<ffffffff813c1436>] ? dpm_resume_end+0x66/0x120
 [<ffffffff810a7260>] ? suspend_devices_and_enter+0xa0/0x170
 [<ffffffff810a7450>] ? enter_state+0x120/0x150
 [<ffffffff810a68a6>] ? state_store+0xc6/0x100
 [<ffffffff812dcae7>] ? kobj_attr_store+0x17/0x20
 [<ffffffff811d3cce>] ? sysfs_write_file+0xde/0x160
 [<ffffffff81164df6>] ? vfs_write+0xc6/0x180
 [<ffffffff81165111>] ? sys_write+0x51/0x90
 [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
---[ end trace f71f0ed87c365bc3 ]---