cfg80211: export interface stopping function

This exports a new cfg80211_stop_iface() function.

This is intended for driver internal interface
combination management and channel switching.

Due to locking issues (it re-enters driver) the
call is asynchronous and uses cfg80211 event
list/worker.

CRs-Fixed: 1114710
Change-Id: I2784dc34b6a20fbe8697473e37cacf8edd35deca
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git
Git-commit: f04c22033c25f71617ac62bcfe75698baa17a0b8
[rsirasan@codeaurora.org: Resolved merge conflicts]
Signed-off-by: Rajeev Kumar Sirasanagandla <rsirasan@codeaurora.org>

7 files changed, 81 insertions, 11 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index e5930177c96a..1ce3ea1fd917 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5474,6 +5474,21 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
 					    void *data),
 			       void *data);
 
+/*
+ * cfg80211_stop_iface - trigger interface disconnection
+ *
+ * @wiphy: the wiphy
+ * @wdev: wireless device
+ * @gfp: context flags
+ *
+ * Trigger interface to be stopped as if AP was stopped, IBSS/mesh left, STA
+ * disconnected.
+ *
+ * Note: This doesn't need any locks and is asynchronous.
+ */
+void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
+			 gfp_t gfp);
+
 /**
  * cfg80211_shutdown_all_interfaces - shut down all interfaces for a wiphy
  * @wiphy: the wiphy to shut down
diff --git a/net/wireless/ap.c b/net/wireless/ap.c
index f09f5683cb30..91d02ac0f42f 100644
--- a/net/wireless/ap.c
+++ b/net/wireless/ap.c
@@ -6,8 +6,8 @@
 #include "rdev-ops.h"
 
 
-static int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
-                             struct net_device *dev, bool notify)
+int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
+		       struct net_device *dev, bool notify)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	int err;
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 30e1a6c027bb..01d0c4eb06fc 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -927,24 +927,24 @@ void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 		rdev->num_running_monitor_ifaces += num;
 }
 
-void cfg80211_leave(struct cfg80211_registered_device *rdev,
-		    struct wireless_dev *wdev)
+void __cfg80211_leave(struct cfg80211_registered_device *rdev,
+		      struct wireless_dev *wdev)
 {
 	struct net_device *dev = wdev->netdev;
 	struct cfg80211_sched_scan_request *sched_scan_req;
 
 	ASSERT_RTNL();
+	ASSERT_WDEV_LOCK(wdev);
 
 	switch (wdev->iftype) {
 	case NL80211_IFTYPE_ADHOC:
-		cfg80211_leave_ibss(rdev, dev, true);
+		__cfg80211_leave_ibss(rdev, dev, true);
 		break;
 	case NL80211_IFTYPE_P2P_CLIENT:
 	case NL80211_IFTYPE_STATION:
 		sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
 		if (sched_scan_req && dev == sched_scan_req->dev)
 			__cfg80211_stop_sched_scan(rdev, false);
-		wdev_lock(wdev);
 #ifdef CONFIG_CFG80211_WEXT
 		kfree(wdev->wext.ie);
 		wdev->wext.ie = NULL;
@@ -954,14 +954,13 @@ void cfg80211_leave(struct cfg80211_registered_device *rdev,
 		cfg80211_disconnect(rdev, dev,
 				    WLAN_REASON_DEAUTH_LEAVING, true);
 		cfg80211_mlme_down(rdev, dev);
-		wdev_unlock(wdev);
 		break;
 	case NL80211_IFTYPE_MESH_POINT:
-		cfg80211_leave_mesh(rdev, dev);
+		__cfg80211_leave_mesh(rdev, dev);
 		break;
 	case NL80211_IFTYPE_AP:
 	case NL80211_IFTYPE_P2P_GO:
-		cfg80211_stop_ap(rdev, dev, false);
+		__cfg80211_stop_ap(rdev, dev, true);
 		break;
 	case NL80211_IFTYPE_OCB:
 		__cfg80211_leave_ocb(rdev, dev);
@@ -984,6 +983,36 @@ void cfg80211_leave(struct cfg80211_registered_device *rdev,
 	wdev->beacon_interval = 0;
 }
 
+void cfg80211_leave(struct cfg80211_registered_device *rdev,
+		    struct wireless_dev *wdev)
+{
+	wdev_lock(wdev);
+	__cfg80211_leave(rdev, wdev);
+	wdev_unlock(wdev);
+}
+
+void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
+			 gfp_t gfp)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_event *ev;
+	unsigned long flags;
+
+	trace_cfg80211_stop_iface(wiphy, wdev);
+
+	ev = kzalloc(sizeof(*ev), gfp);
+	if (!ev)
+		return;
+
+	ev->type = EVENT_STOPPED;
+
+	spin_lock_irqsave(&wdev->event_lock, flags);
+	list_add_tail(&ev->list, &wdev->event_list);
+	spin_unlock_irqrestore(&wdev->event_lock, flags);
+	queue_work(cfg80211_wq, &rdev->event_work);
+}
+EXPORT_SYMBOL(cfg80211_stop_iface);
+
 static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 					 unsigned long state, void *ptr)
 {
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 3ee3d6fc5332..a972e386ad7f 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -199,6 +199,7 @@ enum cfg80211_event_type {
 	EVENT_ROAMED,
 	EVENT_DISCONNECTED,
 	EVENT_IBSS_JOINED,
+	EVENT_STOPPED,
 };
 
 struct cfg80211_event {
@@ -297,6 +298,8 @@ int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 		       struct net_device *dev,
 		       struct mesh_setup *setup,
 		       const struct mesh_config *conf);
+int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
+			  struct net_device *dev);
 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
 			struct net_device *dev);
 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
@@ -316,6 +319,8 @@ int cfg80211_leave_ocb(struct cfg80211_registered_device *rdev,
 		       struct net_device *dev);
 
 /* AP */
+int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
+		       struct net_device *dev, bool notify);
 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
 		     struct net_device *dev, bool notify);
 
@@ -470,6 +475,8 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 			       enum nl80211_iftype iftype, int num);
 
+void __cfg80211_leave(struct cfg80211_registered_device *rdev,
+		      struct wireless_dev *wdev);
 void cfg80211_leave(struct cfg80211_registered_device *rdev,
 		    struct wireless_dev *wdev);
 
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index 929795af643f..092300b30c37 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -238,8 +238,8 @@ int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 	return 0;
 }
 
-static int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
-                                struct net_device *dev)
+int __cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
+			  struct net_device *dev)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	int err;
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 500d72ac719a..b7bf5ba63555 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2827,6 +2827,22 @@ DEFINE_EVENT(wiphy_wdev_evt, rdev_abort_scan,
 	TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev),
 	TP_ARGS(wiphy, wdev)
 );
+
+TRACE_EVENT(cfg80211_stop_iface,
+	TP_PROTO(struct wiphy *wiphy, struct wireless_dev *wdev),
+	TP_ARGS(wiphy, wdev),
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		WDEV_ENTRY
+	),
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		WDEV_ASSIGN;
+	),
+	TP_printk(WIPHY_PR_FMT ", " WDEV_PR_FMT,
+		  WIPHY_PR_ARG, WDEV_PR_ARG)
+);
+
 #endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
 
 #undef TRACE_INCLUDE_PATH
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 00f5cededd38..dfd0766abd6f 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -895,6 +895,9 @@ void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 			__cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
 					       ev->ij.channel);
 			break;
+		case EVENT_STOPPED:
+			__cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
+			break;
 		}
 		wdev_unlock(wdev);