Frequently got this error... :(

Trace:
May  6 03:10:01 gateway kernel: [44975.287831] ------------[ cut here ]------------
May  6 03:10:01 gateway kernel: [44975.287849] WARNING: at /build/buildd/linux-2.6.32/kernel/softirq.c:143 local_bh_enable_ip+0x61/0x90()
May  6 03:10:01 gateway kernel: [44975.287856] Hardware name:
May  6 03:10:01 gateway kernel: [44975.287859] Modules linked in: f71882fg nls_cp437 isofs aes_i586 aes_generic xt_DSCP iptable_mangle ipt_MASQUERADE iptable_nat nf_nat ipt_REJECT xt_recent xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state xt_conntrack nf_conntrack iptable_filter ip_tables x_tables nfsd exportfs nfs lockd nfs_acl arc4 auth_rpcgss fbcon tileblit font bitblit softcursor vga16fb vgastate sunrpc bridge stp i915 drm_kms_helper ath9k mac80211 drm ath i2c_algo_bit ppdev cfg80211 intel_agp video lp parport_pc led_class psmouse output agpgart serio_raw parport r8169 mii [last unloaded: f71882fg]
May  6 03:10:01 gateway kernel: [44975.287959] Pid: 1170, comm: hostapd Not tainted 2.6.32-22-generic #33-Ubuntu
May  6 03:10:01 gateway kernel: [44975.287965] Call Trace:
May  6 03:10:01 gateway kernel: [44975.287976]  [<c014c3d2>] warn_slowpath_common+0x72/0xa0
May  6 03:10:01 gateway kernel: [44975.287985]  [<c0153381>] ? local_bh_enable_ip+0x61/0x90
May  6 03:10:01 gateway kernel: [44975.287992]  [<c0153381>] ? local_bh_enable_ip+0x61/0x90
May  6 03:10:01 gateway kernel: [44975.288000]  [<c014c41a>] warn_slowpath_null+0x1a/0x20
May  6 03:10:01 gateway kernel: [44975.288007]  [<c0153381>] local_bh_enable_ip+0x61/0x90
May  6 03:10:01 gateway kernel: [44975.288017]  [<c058b866>] _spin_unlock_bh+0x16/0x20
May  6 03:10:01 gateway kernel: [44975.288045]  [<f83f418f>] ath_tx_node_cleanup+0x14f/0x170 [ath9k]
May  6 03:10:01 gateway kernel: [44975.288068]  [<f83eeeee>] ath9k_sta_notify+0x4e/0xb0 [ath9k]
May  6 03:10:01 gateway kernel: [44975.288092]  [<f8348647>] __sta_info_unlink+0x127/0x1b0 [mac80211]
May  6 03:10:01 gateway kernel: [44975.288115]  [<f83eeea0>] ? ath9k_sta_notify+0x0/0xb0 [ath9k]
May  6 03:10:01 gateway kernel: [44975.288138]  [<f8348703>] sta_info_unlink+0x33/0x50 [mac80211]
May  6 03:10:01 gateway kernel: [44975.288165]  [<f8355f60>] ? ieee80211_del_station+0x0/0x60 [mac80211]
May  6 03:10:01 gateway kernel: [44975.288191]  [<f8355fa5>] ieee80211_del_station+0x45/0x60 [mac80211]
May  6 03:10:01 gateway kernel: [44975.288216]  [<f80649ce>] nl80211_del_station+0x6e/0xc0 [cfg80211]
May  6 03:10:01 gateway kernel: [44975.288230]  [<c04e2567>] genl_rcv_msg+0x227/0x250
May  6 03:10:01 gateway kernel: [44975.288243]  [<c04e2340>] ? genl_rcv_msg+0x0/0x250
May  6 03:10:01 gateway kernel: [44975.288251]  [<c04e14e6>] netlink_rcv_skb+0x86/0xb0
May  6 03:10:01 gateway kernel: [44975.288258]  [<c04e2331>] genl_rcv+0x21/0x30
May  6 03:10:01 gateway kernel: [44975.288265]  [<c04e11a9>] netlink_unicast+0x259/0x280
May  6 03:10:01 gateway kernel: [44975.288273]  [<c04e1dca>] netlink_sendmsg+0x1ba/0x2a0
May  6 03:10:01 gateway kernel: [44975.288283]  [<c03208b5>] ? apparmor_socket_sendmsg+0x15/0x20
May  6 03:10:01 gateway kernel: [44975.288292]  [<c04b38a5>] sock_sendmsg+0xe5/0x110
May  6 03:10:01 gateway kernel: [44975.288302]  [<c0167740>] ? autoremove_wake_function+0x0/0x50
May  6 03:10:01 gateway kernel: [44975.288310]  [<c0167740>] ? autoremove_wake_function+0x0/0x50
May  6 03:10:01 gateway kernel: [44975.288318]  [<c058955c>] ? schedule+0x44c/0x840
May  6 03:10:01 gateway kernel: [44975.288326]  [<c03532bd>] ? copy_from_user+0x3d/0x130
May  6 03:10:01 gateway kernel: [44975.288334]  [<c04bc8ca>] ? verify_iovec+0x5a/0xa0
May  6 03:10:01 gateway kernel: [44975.288342]  [<c04b41ed>] sys_sendmsg+0x15d/0x290
May  6 03:10:01 gateway kernel: [44975.288352]  [<c012a438>] ? default_spin_lock_flags+0x8/0x10
May  6 03:10:01 gateway kernel: [44975.288360]  [<c058b5ef>] ? _spin_lock_irqsave+0x2f/0x50
May  6 03:10:01 gateway kernel: [44975.288368]  [<c04b1e15>] ? sock_destroy_inode+0x15/0x20
May  6 03:10:01 gateway kernel: [44975.288377]  [<c021c524>] ? destroy_inode+0x24/0x40
May  6 03:10:01 gateway kernel: [44975.288385]  [<c021cf9a>] ? generic_drop_inode+0x4a/0x80
May  6 03:10:01 gateway kernel: [44975.288393]  [<c0218cfe>] ? __d_free+0x2e/0x50
May  6 03:10:01 gateway kernel: [44975.288400]  [<c0218d5f>] ? d_free+0x3f/0x50
May  6 03:10:01 gateway kernel: [44975.288407]  [<c022002f>] ? mntput_no_expire+0x1f/0xe0
May  6 03:10:01 gateway kernel: [44975.288415]  [<c02094d7>] ? __fput+0x177/0x1f0
May  6 03:10:01 gateway kernel: [44975.288423]  [<c04b480c>] sys_socketcall+0xcc/0x280
May  6 03:10:01 gateway kernel: [44975.288432]  [<c0205a8c>] ? filp_close+0x4c/0x80
May  6 03:10:01 gateway kernel: [44975.288440]  [<c0205b35>] ? sys_close+0x75/0xc0
May  6 03:10:01 gateway kernel: [44975.288448]  [<c01033ec>] syscall_call+0x7/0xb
May  6 03:10:01 gateway kernel: [44975.288454] ---[ end trace edddb6b427c4896e ]---
May  6 03:10:01 gateway kernel: [44975.412762] ath9k: Failed to stop TX DMA in 100 msec after killing last frame