Revert "ath9k: fix lockdep warning when unloading module" on stable kernels

Johannes' patch 34e89507 titled:

	mac80211: allow station add/remove to sleep

changed the way mac80211 adds and removes peers. The new
sta_add() / sta_remove() callbacks allowed the driver callbacks
to sleep. Johannes also ported ath9k to use sta_add() / sta_remove()
via the patch 4ca77860 titled:

	ath9k: convert to new station add/remove callbacks

but this patch forgot to address a change in locking issue which
Ming Lei eventually found on his 2.6.33-wl #12 build. The 2.6.33-wl
build includes code for the 802.11 subsystem for 2.6.34 though so did
already have the above two patches (ath9k_sta_remove() on his trace),
the 2.6.33 kernel did not however have these two patches. Ming eventually
cured his lockdep warnign via the patch a9f042cb titled:

	ath9k: fix lockdep warning when unloading module

This went in to 2.6.34 and although it was not marked as a stable
fix it did get trickled down and applied on both 2.6.33 and 2.6.32.

In review, the culprits:

	mac80211: allow station add/remove to sleep
git describe --contains 34e89507
v2.6.34-rc1~233^2~49^2~107

	ath9k: convert to new station add/remove callbacks
git describe --contains 4ca77860
v2.6.34-rc1~233^2~49^2~10

	ath9k: fix lockdep warning when unloading module

This last one trickled down to 2.6.33 (OK), 2.6.33 (invalid) and 2.6.32 (invalid).

git describe --contains a9f042cb
v2.6.34-rc2~48^2~77^2~7
git describe --contains 0524bcfa
v2.6.33.2~125
git describe --contains 0dcc9985
v2.6.32.11~79

The patch titled "ath9k: fix lockdep warning when unloading module"
should be reverted on both 2.6.33 and 2.6.32 as it is invalid and
actually ended up causing the following warning:

ADDRCONF(NETDEV_CHANGE): wlan31: link becomes ready
phy0: WMM queue=2 aci=0 acm=0 aifs=3 cWmin=15 cWmax=1023 txop=0
phy0: WMM queue=3 aci=1 acm=0 aifs=7 cWmin=15 cWmax=1023 txop=0
phy0: WMM queue=1 aci=2 acm=0 aifs=2 cWmin=7 cWmax=15 txop=94
phy0: WMM queue=0 aci=3 acm=0 aifs=2 cWmin=3 cWmax=7 txop=47
phy0: device now idle
------------[ cut here ]------------
WARNING: at kernel/softirq.c:143 local_bh_enable_ip+0x7b/0xa0()
Hardware name: 7660A14
Modules linked in: ath9k(-) mac80211 ath cfg80211 <whatever-bleh-etc>
Pid: 2003, comm: rmmod Not tainted 2.6.32.11 #6
Call Trace:
 [<ffffffff8105d178>] warn_slowpath_common+0x78/0xb0
 [<ffffffff8105d1bf>] warn_slowpath_null+0xf/0x20
 [<ffffffff81063f8b>] local_bh_enable_ip+0x7b/0xa0
 [<ffffffff815121e4>] _spin_unlock_bh+0x14/0x20
 [<ffffffffa034aea5>] ath_tx_node_cleanup+0x185/0x1b0 [ath9k]
 [<ffffffffa0345597>] ath9k_sta_notify+0x57/0xb0 [ath9k]
 [<ffffffffa02ac51a>] __sta_info_unlink+0x15a/0x260 [mac80211]
 [<ffffffffa02ac658>] sta_info_unlink+0x38/0x60 [mac80211]
 [<ffffffffa02b3fbe>] ieee80211_set_disassoc+0x1ae/0x210 [mac80211]
 [<ffffffffa02b42d9>] ieee80211_mgd_deauth+0x109/0x110 [mac80211]
 [<ffffffffa02ba409>] ieee80211_deauth+0x19/0x20 [mac80211]
 [<ffffffffa028160e>] __cfg80211_mlme_deauth+0xee/0x130 [cfg80211]
 [<ffffffff81118540>] ? init_object+0x50/0x90
 [<ffffffffa0285429>] __cfg80211_disconnect+0x159/0x1d0 [cfg80211]
 [<ffffffffa027125f>] cfg80211_netdev_notifier_call+0x10f/0x450 [cfg80211]
 [<ffffffff81514ca7>] notifier_call_chain+0x47/0x90
 [<ffffffff8107f501>] raw_notifier_call_chain+0x11/0x20
 [<ffffffff81442d66>] call_netdevice_notifiers+0x16/0x20
 [<ffffffff8144352d>] dev_close+0x4d/0xa0
 [<ffffffff814439a8>] rollback_registered+0x48/0x120
 [<ffffffff81443a9d>] unregister_netdevice+0x1d/0x70
 [<ffffffffa02b6cc4>] ieee80211_remove_interfaces+0x84/0xc0 [mac80211]
 [<ffffffffa02aa072>] ieee80211_unregister_hw+0x42/0xf0 [mac80211]
 [<ffffffffa0347bde>] ath_detach+0x8e/0x180 [ath9k]
 [<ffffffffa0347ce1>] ath_cleanup+0x11/0x50 [ath9k]
 [<ffffffffa0351a2c>] ath_pci_remove+0x1c/0x20 [ath9k]
 [<ffffffff8129d712>] pci_device_remove+0x32/0x60
 [<ffffffff81332373>] __device_release_driver+0x53/0xb0
 [<ffffffff81332498>] driver_detach+0xc8/0xd0
 [<ffffffff81331405>] bus_remove_driver+0x85/0xe0
 [<ffffffff81332a5a>] driver_unregister+0x5a/0x90
 [<ffffffff8129da00>] pci_unregister_driver+0x40/0xb0
 [<ffffffffa03518d0>] ath_pci_exit+0x10/0x20 [ath9k]
 [<ffffffffa0353cd5>] ath9k_exit+0x9/0x2a [ath9k]
 [<ffffffff81092838>] sys_delete_module+0x1a8/0x270
 [<ffffffff8107ebe9>] ? up_read+0x9/0x10
 [<ffffffff81011f82>] system_call_fastpath+0x16/0x1b
---[ end trace fad957019ffdd40b ]---
phy0: Removed STA 00:22:6b:56:fd:e8
phy0: Destroyed STA 00:22:6b:56:fd:e8
wlan31: deauthenticating from 00:22:6b:56:fd:e8 by local choice (reason=3)
ath9k 0000:16:00.0: PCI INT A disabled

The original lockdep fixed an issue where due to the new changes
the driver was not disabling the bottom halves but it is incorrect
to do this on the older kernels since IRQs are already disabled.

Cc: Ming Lei <tom.leiming@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/wireless/ath/ath9k/xmit.c

@@ -2190,7 +2190,7 @@ void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
 		if (ATH_TXQ_SETUP(sc, i)) {
 			txq = &sc->tx.txq[i];
 
-			spin_lock_bh(&txq->axq_lock);
+			spin_lock(&txq->axq_lock);
 
 			list_for_each_entry_safe(ac,
 					ac_tmp, &txq->axq_acq, list) {
@@ -2211,7 +2211,7 @@ void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
 				}
 			}
 
-			spin_unlock_bh(&txq->axq_lock);
+			spin_unlock(&txq->axq_lock);
 		}
 	}
 }