cfg80211/mac80211: use cfg80211 wdev mutex in mac80211

Using separate locks in cfg80211 and mac80211 has always
caused issues, for example having to unlock in places in
mac80211 to call cfg80211, which even needed a framework
to make cfg80211 calls after some functions returned etc.

Additionally, I suspect some issues people have reported
with the cfg80211 state getting confused could be due to
such issues, when cfg80211 is asking mac80211 to change
state but mac80211 is in the process of telling cfg80211
that the state changed (in another way.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 10 insertions, 42 deletions

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 68b40f21bc38..80ffb0138919 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -25,12 +25,9 @@ void cfg80211_send_rx_auth(struct net_device *dev, const u8 *buf, size_t len)
         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 
         trace_cfg80211_send_rx_auth(dev);
-        wdev_lock(wdev);
 
         nl80211_send_rx_auth(rdev, dev, buf, len, GFP_KERNEL);
         cfg80211_sme_rx_auth(dev, buf, len);
-
-        wdev_unlock(wdev);
 }
 EXPORT_SYMBOL(cfg80211_send_rx_auth);
 
@@ -46,7 +43,6 @@ void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
         int ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
 
         trace_cfg80211_send_rx_assoc(dev, bss);
-        wdev_lock(wdev);
 
         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
 
@@ -59,7 +55,7 @@ void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
         if (status_code != WLAN_STATUS_SUCCESS && wdev->conn &&
             cfg80211_sme_failed_reassoc(wdev)) {
                 cfg80211_put_bss(wiphy, bss);
-                goto out;
+                return;
         }
 
         nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL);
@@ -71,7 +67,7 @@ void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
                  * sme will schedule work that does it later.
                  */
                 cfg80211_put_bss(wiphy, bss);
-                goto out;
+                return;
         }
 
         if (!wdev->conn && wdev->sme_state == CFG80211_SME_IDLE) {
@@ -87,13 +83,11 @@ void cfg80211_send_rx_assoc(struct net_device *dev, struct cfg80211_bss *bss,
         __cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
                                   status_code,
                                   status_code == WLAN_STATUS_SUCCESS, bss);
- out:
-        wdev_unlock(wdev);
 }
 EXPORT_SYMBOL(cfg80211_send_rx_assoc);
 
-void __cfg80211_send_deauth(struct net_device *dev,
-                                   const u8 *buf, size_t len)
+void cfg80211_send_deauth(struct net_device *dev,
+                          const u8 *buf, size_t len)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -102,7 +96,7 @@ void __cfg80211_send_deauth(struct net_device *dev,
         const u8 *bssid = mgmt->bssid;
         bool was_current = false;
 
-        trace___cfg80211_send_deauth(dev);
+        trace_cfg80211_send_deauth(dev);
         ASSERT_WDEV_LOCK(wdev);
 
         if (wdev->current_bss &&
@@ -129,20 +123,10 @@ void __cfg80211_send_deauth(struct net_device *dev,
                                           false, NULL);
         }
 }
-EXPORT_SYMBOL(__cfg80211_send_deauth);
-
-void cfg80211_send_deauth(struct net_device *dev, const u8 *buf, size_t len)
-{
-        struct wireless_dev *wdev = dev->ieee80211_ptr;
-
-        wdev_lock(wdev);
-        __cfg80211_send_deauth(dev, buf, len);
-        wdev_unlock(wdev);
-}
 EXPORT_SYMBOL(cfg80211_send_deauth);
 
-void __cfg80211_send_disassoc(struct net_device *dev,
-                                     const u8 *buf, size_t len)
+void cfg80211_send_disassoc(struct net_device *dev,
+                            const u8 *buf, size_t len)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct wiphy *wiphy = wdev->wiphy;
@@ -152,7 +136,7 @@ void __cfg80211_send_disassoc(struct net_device *dev,
         u16 reason_code;
         bool from_ap;
 
-        trace___cfg80211_send_disassoc(dev);
+        trace_cfg80211_send_disassoc(dev);
         ASSERT_WDEV_LOCK(wdev);
 
         nl80211_send_disassoc(rdev, dev, buf, len, GFP_KERNEL);
@@ -175,16 +159,6 @@ void __cfg80211_send_disassoc(struct net_device *dev,
         from_ap = !ether_addr_equal(mgmt->sa, dev->dev_addr);
         __cfg80211_disconnected(dev, NULL, 0, reason_code, from_ap);
 }
-EXPORT_SYMBOL(__cfg80211_send_disassoc);
-
-void cfg80211_send_disassoc(struct net_device *dev, const u8 *buf, size_t len)
-{
-        struct wireless_dev *wdev = dev->ieee80211_ptr;
-
-        wdev_lock(wdev);
-        __cfg80211_send_disassoc(dev, buf, len);
-        wdev_unlock(wdev);
-}
 EXPORT_SYMBOL(cfg80211_send_disassoc);
 
 void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr)
@@ -194,15 +168,12 @@ void cfg80211_send_auth_timeout(struct net_device *dev, const u8 *addr)
         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 
         trace_cfg80211_send_auth_timeout(dev, addr);
-        wdev_lock(wdev);
 
         nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
         if (wdev->sme_state == CFG80211_SME_CONNECTING)
                 __cfg80211_connect_result(dev, addr, NULL, 0, NULL, 0,
                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
                                           false, NULL);
-
-        wdev_unlock(wdev);
 }
 EXPORT_SYMBOL(cfg80211_send_auth_timeout);
 
@@ -213,15 +184,12 @@ void cfg80211_send_assoc_timeout(struct net_device *dev, const u8 *addr)
         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 
         trace_cfg80211_send_assoc_timeout(dev, addr);
-        wdev_lock(wdev);
 
         nl80211_send_assoc_timeout(rdev, dev, addr, GFP_KERNEL);
         if (wdev->sme_state == CFG80211_SME_CONNECTING)
                 __cfg80211_connect_result(dev, addr, NULL, 0, NULL, 0,
                                           WLAN_STATUS_UNSPECIFIED_FAILURE,
                                           false, NULL);
-
-        wdev_unlock(wdev);
 }
 EXPORT_SYMBOL(cfg80211_send_assoc_timeout);
 
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 5755bc14abbd..23fafeae8a10 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -1911,12 +1911,12 @@ TRACE_EVENT(cfg80211_send_rx_assoc,
                   NETDEV_PR_ARG, MAC_PR_ARG(bssid), CHAN_PR_ARG)
 );
 
-DEFINE_EVENT(netdev_evt_only, __cfg80211_send_deauth,
+DEFINE_EVENT(netdev_evt_only, cfg80211_send_deauth,
         TP_PROTO(struct net_device *netdev),
         TP_ARGS(netdev)
 );
 
-DEFINE_EVENT(netdev_evt_only, __cfg80211_send_disassoc,
+DEFINE_EVENT(netdev_evt_only, cfg80211_send_disassoc,
         TP_PROTO(struct net_device *netdev),
         TP_ARGS(netdev)
 );