mac80211: avoid deadlock revealed by lockdep

sdata->u.ap.request_smps_work can’t be flushed synchronously
under wdev_lock(wdev) since ieee80211_request_smps_ap_work
itself locks the same lock.
While at it, reset the driver_smps_mode when the ap is
stopped to its default: OFF.

This solves:

======================================================
[ INFO: possible circular locking dependency detected ]
3.12.0-ipeer+ #2 Tainted: G           O
-------------------------------------------------------
rmmod/2867 is trying to acquire lock:
  ((&sdata->u.ap.request_smps_work)){+.+...}, at: [<c105b8d0>] flush_work+0x0/0x90

but task is already holding lock:
  (&wdev->mtx){+.+.+.}, at: [<f9b32626>] cfg80211_stop_ap+0x26/0x230 [cfg80211]

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (&wdev->mtx){+.+.+.}:
        [<c10aefa9>] lock_acquire+0x79/0xe0
        [<c1607a1a>] mutex_lock_nested+0x4a/0x360
        [<fb06288b>] ieee80211_request_smps_ap_work+0x2b/0x50 [mac80211]
        [<c105cdd8>] process_one_work+0x198/0x450
        [<c105d469>] worker_thread+0xf9/0x320
        [<c10669ff>] kthread+0x9f/0xb0
        [<c1613397>] ret_from_kernel_thread+0x1b/0x28

-> #0 ((&sdata->u.ap.request_smps_work)){+.+...}:
        [<c10ae9df>] __lock_acquire+0x183f/0x1910
        [<c10aefa9>] lock_acquire+0x79/0xe0
        [<c105b917>] flush_work+0x47/0x90
        [<c105d867>] __cancel_work_timer+0x67/0xe0
        [<c105d90f>] cancel_work_sync+0xf/0x20
        [<fb0765cc>] ieee80211_stop_ap+0x8c/0x340 [mac80211]
        [<f9b3268c>] cfg80211_stop_ap+0x8c/0x230 [cfg80211]
        [<f9b0d8f9>] cfg80211_leave+0x79/0x100 [cfg80211]
        [<f9b0da72>] cfg80211_netdev_notifier_call+0xf2/0x4f0 [cfg80211]
        [<c160f2c9>] notifier_call_chain+0x59/0x130
        [<c106c6de>] __raw_notifier_call_chain+0x1e/0x30
        [<c106c70f>] raw_notifier_call_chain+0x1f/0x30
        [<c14f8213>] call_netdevice_notifiers_info+0x33/0x70
        [<c14f8263>] call_netdevice_notifiers+0x13/0x20
        [<c14f82a4>] __dev_close_many+0x34/0xb0
        [<c14f83fe>] dev_close_many+0x6e/0xc0
        [<c14f9c77>] rollback_registered_many+0xa7/0x1f0
        [<c14f9dd4>] unregister_netdevice_many+0x14/0x60
        [<fb06f4d9>] ieee80211_remove_interfaces+0xe9/0x170 [mac80211]
        [<fb055116>] ieee80211_unregister_hw+0x56/0x110 [mac80211]
        [<fa3e9396>] iwl_op_mode_mvm_stop+0x26/0xe0 [iwlmvm]
        [<f9b9d8ca>] _iwl_op_mode_stop+0x3a/0x70 [iwlwifi]
        [<f9b9d96f>] iwl_opmode_deregister+0x6f/0x90 [iwlwifi]
        [<fa405179>] __exit_compat+0xd/0x19 [iwlmvm]
        [<c10b8bf9>] SyS_delete_module+0x179/0x2b0
        [<c1613421>] sysenter_do_call+0x12/0x32

Fixes: 687da132234f ("mac80211: implement SMPS for AP")
Cc: <stable@vger.kernel.org> [3.13]
Reported-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 15 insertions, 7 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 94b4acb5aabb..33acdca4a1df 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1090,8 +1090,6 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
         kfree(sdata->u.ap.next_beacon);
         sdata->u.ap.next_beacon = NULL;
 
-        cancel_work_sync(&sdata->u.ap.request_smps_work);
-
         /* turn off carrier for this interface and dependent VLANs */
         list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
                 netif_carrier_off(vlan->dev);
@@ -1103,6 +1101,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
         kfree_rcu(old_beacon, rcu_head);
         if (old_probe_resp)
                 kfree_rcu(old_probe_resp, rcu_head);
+        sdata->u.ap.driver_smps_mode = IEEE80211_SMPS_OFF;
 
         __sta_info_flush(sdata, true);
         ieee80211_free_keys(sdata, true);
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index fab7b91923e0..70dd013de836 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -466,7 +466,9 @@ void ieee80211_request_smps_ap_work(struct work_struct *work)
                              u.ap.request_smps_work);
 
         sdata_lock(sdata);
-        __ieee80211_request_smps_ap(sdata, sdata->u.ap.driver_smps_mode);
+        if (sdata_dereference(sdata->u.ap.beacon, sdata))
+                __ieee80211_request_smps_ap(sdata,
+                                            sdata->u.ap.driver_smps_mode);
         sdata_unlock(sdata);
 }
 
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 3dfd20a453ab..ae2eb148a028 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -770,12 +770,19 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 
         ieee80211_roc_purge(local, sdata);
 
-        if (sdata->vif.type == NL80211_IFTYPE_STATION)
+        switch (sdata->vif.type) {
+        case NL80211_IFTYPE_STATION:
                 ieee80211_mgd_stop(sdata);
-
-        if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
+                break;
+        case NL80211_IFTYPE_ADHOC:
                 ieee80211_ibss_stop(sdata);
-
+                break;
+        case NL80211_IFTYPE_AP:
+                cancel_work_sync(&sdata->u.ap.request_smps_work);
+                break;
+        default:
+                break;
+        }
 
         /*
          * Remove all stations associated with this interface.