Got this -- don't think it's related to my patches.
[ 255.700902] =======================================================
[ 255.700907] [ INFO: possible circular locking dependency detected ]
[ 255.700911] 2.6.30-rc2-wl-21724-g42dd251-dirty #5
[ 255.700913] -------------------------------------------------------
[ 255.700917] khubd/1305 is trying to acquire lock:
[ 255.700920] (&(&ar->tx_status_janitor)->work){+.+...}, at: [<ffffffff80259600>] wait_on_work+0x0/0x140
[ 255.700931]
[ 255.700932] but task is already holding lock:
[ 255.700934] (&ar->mutex){+.+...}, at: [<ffffffffa03412d8>] ar9170_op_stop+0x38/0xb0 [ar9170usb]
[ 255.700945]
[ 255.700946] which lock already depends on the new lock.
[ 255.700947]
[ 255.700949]
[ 255.700950] the existing dependency chain (in reverse order) is:
[ 255.700953]
[ 255.700954] -> #1 (&ar->mutex){+.+...}:
[ 255.700959] [<ffffffff80272615>] check_prev_add+0x365/0x720
[ 255.700965] [<ffffffff80272fce>] validate_chain+0x5fe/0x6c0
[ 255.700969] [<ffffffff802734cf>] __lock_acquire+0x43f/0x9f0
[ 255.700974] [<ffffffff80273b90>] lock_acquire+0x110/0x150
[ 255.700978] [<ffffffff805c2c3b>] mutex_lock_nested+0x6b/0x3e0
[ 255.700985] [<ffffffffa03427c9>] ar9170_tx_status_janitor+0x39/0xe0 [ar9170usb]
[ 255.700992] [<ffffffff80258b05>] run_workqueue+0x165/0x2a0
[ 255.700996] [<ffffffff80258cef>] worker_thread+0xaf/0x130
[ 255.701000] [<ffffffff8025d8f6>] kthread+0x56/0x90
[ 255.701005] [<ffffffff8020c6ba>] child_rip+0xa/0x20
[ 255.701011] [<ffffffffffffffff>] 0xffffffffffffffff
[ 255.701033]
[ 255.701034] -> #0 (&(&ar->tx_status_janitor)->work){+.+...}:
[ 255.701039] [<ffffffff80272312>] check_prev_add+0x62/0x720
[ 255.701044] [<ffffffff80272fce>] validate_chain+0x5fe/0x6c0
[ 255.701049] [<ffffffff802734cf>] __lock_acquire+0x43f/0x9f0
[ 255.701053] [<ffffffff80273b90>] lock_acquire+0x110/0x150
[ 255.701058] [<ffffffff8025964b>] wait_on_work+0x4b/0x140
[ 255.701062] [<ffffffff80259784>] __cancel_work_timer+0x44/0x100
[ 255.701067] [<ffffffff8025984d>] cancel_delayed_work_sync+0xd/0x10
[ 255.701071] [<ffffffffa03412e4>] ar9170_op_stop+0x44/0xb0 [ar9170usb]
[ 255.701079] [<ffffffffa0206178>] ieee80211_stop+0x2e8/0x690 [mac80211]
[ 255.701098] [<ffffffff80504374>] dev_close+0x84/0xd0
[ 255.701103] [<ffffffff80504405>] rollback_registered+0x45/0x140
[ 255.701108] [<ffffffff8050451d>] unregister_netdevice+0x1d/0x60
[ 255.701112] [<ffffffffa02058f7>] ieee80211_remove_interfaces+0x77/0xc0 [mac80211]
[ 255.701129] [<ffffffffa01f70d2>] ieee80211_unregister_hw+0x42/0x100 [mac80211]
[ 255.701145] [<ffffffffa0340399>] ar9170_unregister+0x29/0x40 [ar9170usb]
[ 255.701153] [<ffffffffa033fbc2>] ar9170_usb_disconnect+0x32/0x80 [ar9170usb]
[ 255.701160] [<ffffffffa0019c65>] usb_unbind_interface+0x65/0x170 [usbcore]
[ 255.701179] [<ffffffff80492a32>] __device_release_driver+0x72/0xc0
[ 255.701185] [<ffffffff80492b78>] device_release_driver+0x28/0x40
[ 255.701189] [<ffffffff80491e60>] bus_remove_device+0xb0/0xf0
[ 255.701194] [<ffffffff80490028>] device_del+0x138/0x1d0
[ 255.701200] [<ffffffffa0016565>] usb_disable_device+0xb5/0x140 [usbcore]
[ 255.701217] [<ffffffffa001169b>] usb_disconnect+0xbb/0x130 [usbcore]
[ 255.701234] [<ffffffffa0011e1e>] hub_port_connect_change+0x1be/0xa20 [usbcore]
[ 255.701250] [<ffffffffa00128d3>] hub_events+0x253/0x690 [usbcore]
[ 255.701267] [<ffffffffa0012d4d>] hub_thread+0x3d/0x180 [usbcore]
[ 255.701283] [<ffffffff8025d8f6>] kthread+0x56/0x90
[ 255.701288] [<ffffffff8020c6ba>] child_rip+0xa/0x20
[ 255.701293] [<ffffffffffffffff>] 0xffffffffffffffff
[ 255.701298]
[ 255.701299] other info that might help us debug this:
[ 255.701300]
[ 255.701303] 2 locks held by khubd/1305:
[ 255.701306] #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff8050e9b2>] rtnl_lock+0x12/0x20
[ 255.701315] #1: (&ar->mutex){+.+...}, at: [<ffffffffa03412d8>] ar9170_op_stop+0x38/0xb0 [ar9170usb]
[ 255.701326]
[ 255.701327] stack backtrace:
[ 255.701331] Pid: 1305, comm: khubd Tainted: G W 2.6.30-rc2-wl-21724-g42dd251-dirty #5
[ 255.701334] Call Trace:
[ 255.701340] [<ffffffff80271cb0>] print_circular_bug_tail+0xe0/0xf0
[ 255.701346] [<ffffffff80272312>] check_prev_add+0x62/0x720
[ 255.701351] [<ffffffff8020e518>] ? dump_trace+0x128/0x300
[ 255.701357] [<ffffffff80272fce>] validate_chain+0x5fe/0x6c0
[ 255.701362] [<ffffffff802734cf>] __lock_acquire+0x43f/0x9f0
[ 255.701368] [<ffffffff80273b90>] lock_acquire+0x110/0x150
[ 255.701373] [<ffffffff80259600>] ? wait_on_work+0x0/0x140
[ 255.701378] [<ffffffff8025964b>] wait_on_work+0x4b/0x140
[ 255.701383] [<ffffffff80259600>] ? wait_on_work+0x0/0x140
[ 255.701389] [<ffffffff8026ecaa>] ? get_lock_stats+0x2a/0x60
[ 255.701394] [<ffffffff80270ce8>] ? mark_held_locks+0x68/0x90
[ 255.701400] [<ffffffff805c2f1d>] ? mutex_lock_nested+0x34d/0x3e0
[ 255.701406] [<ffffffff80271065>] ? trace_hardirqs_on_caller+0x165/0x1c0
[ 255.701412] [<ffffffff805c2eb0>] ? mutex_lock_nested+0x2e0/0x3e0
[ 255.701420] [<ffffffffa03412d8>] ? ar9170_op_stop+0x38/0xb0 [ar9170usb]
[ 255.701425] [<ffffffff80259970>] ? flush_workqueue+0x0/0xc0
[ 255.701431] [<ffffffff80259784>] __cancel_work_timer+0x44/0x100
[ 255.701436] [<ffffffff8025984d>] cancel_delayed_work_sync+0xd/0x10
[ 255.701444] [<ffffffffa03412e4>] ar9170_op_stop+0x44/0xb0 [ar9170usb]
[ 255.701462] [<ffffffffa0206178>] ieee80211_stop+0x2e8/0x690 [mac80211]
[ 255.701480] [<ffffffffa0205f11>] ? ieee80211_stop+0x81/0x690 [mac80211]
[ 255.701487] [<ffffffff80504374>] dev_close+0x84/0xd0
[ 255.701492] [<ffffffff80504405>] rollback_registered+0x45/0x140
[ 255.701497] [<ffffffff8050451d>] unregister_netdevice+0x1d/0x60
[ 255.701514] [<ffffffffa02058f7>] ieee80211_remove_interfaces+0x77/0xc0 [mac80211]
[ 255.701532] [<ffffffffa01f70d2>] ieee80211_unregister_hw+0x42/0x100 [mac80211]
[ 255.701540] [<ffffffffa0340399>] ar9170_unregister+0x29/0x40 [ar9170usb]
[ 255.701548] [<ffffffffa033fbc2>] ar9170_usb_disconnect+0x32/0x80 [ar9170usb]
[ 255.701567] [<ffffffffa0019c65>] usb_unbind_interface+0x65/0x170 [usbcore]
[ 255.701574] [<ffffffff80492a32>] __device_release_driver+0x72/0xc0
[ 255.701579] [<ffffffff80492b78>] device_release_driver+0x28/0x40
[ 255.701585] [<ffffffff80491e60>] bus_remove_device+0xb0/0xf0
[ 255.701591] [<ffffffff80490028>] device_del+0x138/0x1d0
[ 255.701608] [<ffffffffa0016565>] usb_disable_device+0xb5/0x140 [usbcore]
[ 255.701627] [<ffffffffa001169b>] usb_disconnect+0xbb/0x130 [usbcore]
[ 255.701645] [<ffffffffa0011e1e>] hub_port_connect_change+0x1be/0xa20 [usbcore]
[ 255.701652] [<ffffffff802d761c>] ? kfree+0x11c/0x1b0
[ 255.701658] [<ffffffff80271065>] ? trace_hardirqs_on_caller+0x165/0x1c0
[ 255.701663] [<ffffffff802710cd>] ? trace_hardirqs_on+0xd/0x10
[ 255.701681] [<ffffffffa001000a>] ? usb_ep0_reinit+0x1a/0x50 [usbcore]
[ 255.701700] [<ffffffffa0017302>] ? usb_control_msg+0x172/0x1a0 [usbcore]
[ 255.701718] [<ffffffffa00128d3>] hub_events+0x253/0x690 [usbcore]
[ 255.701736] [<ffffffffa0012d4d>] hub_thread+0x3d/0x180 [usbcore]
[ 255.701742] [<ffffffff8025ddf0>] ? autoremove_wake_function+0x0/0x40
[ 255.701760] [<ffffffffa0012d10>] ? hub_thread+0x0/0x180 [usbcore]
[ 255.701766] [<ffffffff8025d8f6>] kthread+0x56/0x90
[ 255.701772] [<ffffffff8020c6ba>] child_rip+0xa/0x20
[ 255.701777] [<ffffffff8020c080>] ? restore_args+0x0/0x30
[ 255.701783] [<ffffffff8025d8a0>] ? kthread+0x0/0x90
[ 255.701788] [<ffffffff8020c6b0>] ? child_rip+0x0/0x20
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