------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.38/net/mac80211/tx.c:661 ieee80211_tx_h_rate_ctrl+0x352/0x4c0 [mac80211]()
Hardware name: Evo N610c                           
wlan1: Dropped data frame as no usable bitrate found while scanning and associated. Target station: 5c:35:3b:08:0a:e8 on 5 GHz band
Modules linked in: cryptd aes_i586 aes_generic binfmt_misc snd_intel8x0 rt2870sta(C) snd_ac97_codec ac97_bus arc4 snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event rt2800usb rt2800lib snd_seq rt2x00usb snd_timer snd_seq_device rt2x00lib radeon mac80211 ttm irda snd drm_kms_helper cfg80211 soundcore drm snd_page_alloc i2c_algo_bit pcmcia ppdev joydev crc_ccitt video yenta_socket parport_pc pcmcia_rsrc pcmcia_core shpchp psmouse serio_raw lp parport e100 floppy
Pid: 34, comm: kworker/u:3 Tainted: G         C  2.6.38-8-generic #42-Ubuntu
Call Trace:
 [<c104f912>] ? warn_slowpath_common+0x72/0xa0
 [<f8270d62>] ? ieee80211_tx_h_rate_ctrl+0x352/0x4c0 [mac80211]
 [<f8270d62>] ? ieee80211_tx_h_rate_ctrl+0x352/0x4c0 [mac80211]
 [<c104f9e3>] ? warn_slowpath_fmt+0x33/0x40
 [<f8270d62>] ? ieee80211_tx_h_rate_ctrl+0x352/0x4c0 [mac80211]
 [<c102d8c8>] ? default_spin_lock_flags+0x8/0x10
 [<c150996f>] ? _raw_spin_lock_irqsave+0x2f/0x50
 [<f8271747>] ? invoke_tx_handlers+0x187/0x220 [mac80211]
 [<f827183f>] ? ieee80211_tx+0x5f/0x1c0 [mac80211]
 [<c1040672>] ? update_cfs_shares+0x62/0x90
 [<c1040745>] ? update_shares+0xa5/0xd0
 [<f8271a40>] ? ieee80211_xmit+0xa0/0x1b0 [mac80211]
 [<f826fa6d>] ? ieee80211_nullfunc_get+0x5d/0x140 [mac80211]
 [<f82726b5>] ? ieee80211_tx_skb+0x45/0x60 [mac80211]
 [<f8260edf>] ? ieee80211_send_nullfunc+0x3f/0x60 [mac80211]
 [<f8262159>] ? ieee80211_dynamic_ps_enable_work+0x89/0x90 [mac80211]
 [<c10688ae>] ? process_one_work+0xfe/0x360
 [<c1067d0a>] ? maybe_create_worker+0xda/0xe0
 [<f82620d0>] ? ieee80211_dynamic_ps_enable_work+0x0/0x90 [mac80211]
 [<c1068e34>] ? worker_thread+0x124/0x2d0
 [<c1068d10>] ? worker_thread+0x0/0x2d0
 [<c106ce04>] ? kthread+0x74/0x80
 [<c106cd90>] ? kthread+0x0/0x80
 [<c100367e>] ? kernel_thread_helper+0x6/0x10
---[ end trace f97c68fce9939fdb ]---