wil6210: rename p2p_wdev_mutex to vif_mutex

As more support is added for multiple VIFs, there is a need
to protect the wil6210_vif structure from access while it is
deleted (mainly from del_virtual_intf operation).
Instead of adding another mutex, use p2p_wdev_mutex and rename
it to vif_mutex to reflect the added role. Its existing roles
are similar so it extends nicely (for example it protects the
scan_request member which is also a member of wil6210_vif).
Signed-off-by: Lior David <liord@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/cfg80211.c

@@ -412,10 +412,10 @@ static void wil_cfg80211_stop_p2p_device(struct wiphy *wiphy,
 
 	wil_dbg_misc(wil, "stop_p2p_device: entered\n");
 	mutex_lock(&wil->mutex);
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	wil_p2p_stop_radio_operations(wil);
 	wil->p2p_dev_started = 0;
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	mutex_unlock(&wil->mutex);
 }
 
@@ -706,14 +706,14 @@ static int wil_cfg80211_scan(struct wiphy *wiphy,
 
 	mutex_lock(&wil->mutex);
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	if (vif->scan_request || vif->p2p.discovery_started) {
 		wil_err(wil, "Already scanning\n");
-		mutex_unlock(&wil->p2p_wdev_mutex);
+		mutex_unlock(&wil->vif_mutex);
 		rc = -EAGAIN;
 		goto out;
 	}
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 
 	if (wdev->iftype == NL80211_IFTYPE_P2P_DEVICE) {
 		if (!wil->p2p_dev_started) {
@@ -825,7 +825,7 @@ static void wil_cfg80211_abort_scan(struct wiphy *wiphy,
 	wil_dbg_misc(wil, "wdev=0x%p iftype=%d\n", wdev, wdev->iftype);
 
 	mutex_lock(&wil->mutex);
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 
 	if (!vif->scan_request)
 		goto out;
@@ -841,7 +841,7 @@ static void wil_cfg80211_abort_scan(struct wiphy *wiphy,
 		wil_abort_scan(vif, true);
 
 out:
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	mutex_unlock(&wil->mutex);
 }
 
@@ -1944,10 +1944,10 @@ static int wil_cfg80211_suspend(struct wiphy *wiphy,
 	wil_dbg_pm(wil, "suspending\n");
 
 	mutex_lock(&wil->mutex);
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	wil_p2p_stop_radio_operations(wil);
 	wil_abort_scan(ndev_to_vif(wil->main_ndev), true);
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	mutex_unlock(&wil->mutex);
 
 out:
@@ -2236,11 +2236,11 @@ void wil_p2p_wdev_free(struct wil6210_priv *wil)
 	struct wireless_dev *p2p_wdev;
 	struct wil6210_vif *vif;
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	p2p_wdev = wil->p2p_wdev;
 	wil->p2p_wdev = NULL;
 	wil->radio_wdev = wil->main_ndev->ieee80211_ptr;
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	if (p2p_wdev) {
 		cfg80211_unregister_wdev(p2p_wdev);
 		vif = wdev_to_vif(wil, p2p_wdev);

drivers/net/wireless/ath/wil6210/main.c

@@ -536,8 +536,8 @@ int wil_priv_init(struct wil6210_priv *wil)
 		spin_lock_init(&wil->vring_tx_data[i].lock);
 
 	mutex_init(&wil->mutex);
+	mutex_init(&wil->vif_mutex);
 	mutex_init(&wil->wmi_mutex);
-	mutex_init(&wil->p2p_wdev_mutex);
 	mutex_init(&wil->halp.lock);
 
 	init_completion(&wil->wmi_ready);
@@ -1066,21 +1066,21 @@ void wil_abort_scan(struct wil6210_vif *vif, bool sync)
 		.aborted = true,
 	};
 
-	lockdep_assert_held(&wil->p2p_wdev_mutex);
+	lockdep_assert_held(&wil->vif_mutex);
 
 	if (!vif->scan_request)
 		return;
 
 	wil_dbg_misc(wil, "Abort scan_request 0x%p\n", vif->scan_request);
 	del_timer_sync(&vif->scan_timer);
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	rc = wmi_abort_scan(vif);
 	if (!rc && sync)
 		wait_event_interruptible_timeout(wil->wq, !vif->scan_request,
 						 msecs_to_jiffies(
 						 WAIT_FOR_SCAN_ABORT_MS));
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	if (vif->scan_request) {
 		cfg80211_scan_done(vif->scan_request, &info);
 		vif->scan_request = NULL;
@@ -1221,9 +1221,9 @@ int wil_reset(struct wil6210_priv *wil, bool load_fw)
 	/* Disable device led before reset*/
 	wmi_led_cfg(wil, false);
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	wil_abort_scan(vif, false);
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 
 	/* prevent NAPI from being scheduled and prevent wmi commands */
 	mutex_lock(&wil->wmi_mutex);
@@ -1444,10 +1444,10 @@ int __wil_down(struct wil6210_priv *wil)
 	}
 	wil_enable_irq(wil);
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	wil_p2p_stop_radio_operations(wil);
 	wil_abort_scan(ndev_to_vif(wil->main_ndev), false);
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 
 	return wil_reset(wil, false);
 }

drivers/net/wireless/ath/wil6210/p2p.c

@@ -158,16 +158,16 @@ int wil_p2p_listen(struct wil6210_priv *wil, struct wireless_dev *wdev,
 	*cookie = ++p2p->cookie;
 	p2p->listen_duration = duration;
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	if (vif->scan_request) {
 		wil_dbg_misc(wil, "Delaying p2p listen until scan done\n");
 		p2p->pending_listen_wdev = wdev;
 		p2p->discovery_started = 1;
 		rc = 0;
-		mutex_unlock(&wil->p2p_wdev_mutex);
+		mutex_unlock(&wil->vif_mutex);
 		goto out;
 	}
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 
 	rc = wil_p2p_start_listen(vif);
 	if (rc)
@@ -228,14 +228,14 @@ int wil_p2p_cancel_listen(struct wil6210_vif *vif, u64 cookie)
 		return -ENOENT;
 	}
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	cfg80211_remain_on_channel_expired(vif_to_radio_wdev(wil, vif),
 					   p2p->cookie,
 					   &p2p->listen_chan,
 					   GFP_KERNEL);
 	if (vif->mid == 0)
 		wil->radio_wdev = wil->main_ndev->ieee80211_ptr;
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	return 0;
 }
 
@@ -257,14 +257,14 @@ void wil_p2p_listen_expired(struct work_struct *work)
 	if (!started)
 		return;
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	cfg80211_remain_on_channel_expired(vif_to_radio_wdev(wil, vif),
 					   p2p->cookie,
 					   &p2p->listen_chan,
 					   GFP_KERNEL);
 	if (vif->mid == 0)
 		wil->radio_wdev = wil->main_ndev->ieee80211_ptr;
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 }
 
 void wil_p2p_search_expired(struct work_struct *work)
@@ -287,7 +287,7 @@ void wil_p2p_search_expired(struct work_struct *work)
 			.aborted = false,
 		};
 
-		mutex_lock(&wil->p2p_wdev_mutex);
+		mutex_lock(&wil->vif_mutex);
 		if (vif->scan_request) {
 			cfg80211_scan_done(vif->scan_request, &info);
 			vif->scan_request = NULL;
@@ -295,7 +295,7 @@ void wil_p2p_search_expired(struct work_struct *work)
 				wil->radio_wdev =
 					wil->main_ndev->ieee80211_ptr;
 		}
-		mutex_unlock(&wil->p2p_wdev_mutex);
+		mutex_unlock(&wil->vif_mutex);
 	}
 }
 
@@ -314,17 +314,17 @@ void wil_p2p_delayed_listen_work(struct work_struct *work)
 	if (!p2p->discovery_started || !p2p->pending_listen_wdev)
 		goto out;
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	if (vif->scan_request) {
 		/* another scan started, wait again... */
-		mutex_unlock(&wil->p2p_wdev_mutex);
+		mutex_unlock(&wil->vif_mutex);
 		goto out;
 	}
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 
 	rc = wil_p2p_start_listen(vif);
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	if (rc) {
 		cfg80211_remain_on_channel_expired(p2p->pending_listen_wdev,
 						   p2p->cookie,
@@ -340,7 +340,7 @@ void wil_p2p_delayed_listen_work(struct work_struct *work)
 			wil->radio_wdev = p2p->pending_listen_wdev;
 	}
 	p2p->pending_listen_wdev = NULL;
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 
 out:
 	mutex_unlock(&wil->mutex);
@@ -355,7 +355,7 @@ void wil_p2p_stop_radio_operations(struct wil6210_priv *wil)
 	};
 
 	lockdep_assert_held(&wil->mutex);
-	lockdep_assert_held(&wil->p2p_wdev_mutex);
+	lockdep_assert_held(&wil->vif_mutex);
 
 	if (wil->radio_wdev != wil->p2p_wdev)
 		goto out;
@@ -369,9 +369,9 @@ void wil_p2p_stop_radio_operations(struct wil6210_priv *wil)
 	}
 
 	/* Search or listen on p2p device */
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 	wil_p2p_stop_discovery(vif);
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 
 	if (vif->scan_request) {
 		/* search */

drivers/net/wireless/ath/wil6210/wil6210.h

@@ -725,6 +725,7 @@ struct wil6210_priv {
 	wait_queue_head_t wq; /* for all wait_event() use */
 	u8 max_vifs; /* maximum number of interfaces, including main */
 	struct wil6210_vif *vifs[WIL_MAX_VIFS];
+	struct mutex vif_mutex; /* protects access to VIF entries */
 	/* profile */
 	struct cfg80211_chan_def monitor_chandef;
 	u32 monitor_flags;
@@ -793,7 +794,6 @@ struct wil6210_priv {
 
 	/* P2P_DEVICE vif */
 	struct wireless_dev *p2p_wdev;
-	struct mutex p2p_wdev_mutex; /* protect @p2p_wdev and @scan_request */
 	struct wireless_dev *radio_wdev;
 
 	/* High Access Latency Policy voting */

drivers/net/wireless/ath/wil6210/wmi.c

@@ -766,10 +766,10 @@ static void wmi_evt_rx_mgmt(struct wil6210_vif *vif, int id, void *d, int len)
 			wil_err(wil, "cfg80211_inform_bss_frame() failed\n");
 		}
 	} else {
-		mutex_lock(&wil->p2p_wdev_mutex);
+		mutex_lock(&wil->vif_mutex);
 		cfg80211_rx_mgmt(vif_to_radio_wdev(wil, vif), freq, signal,
 				 (void *)rx_mgmt_frame, d_len, 0);
-		mutex_unlock(&wil->p2p_wdev_mutex);
+		mutex_unlock(&wil->vif_mutex);
 	}
 }
 
@@ -789,7 +789,7 @@ static void wmi_evt_scan_complete(struct wil6210_vif *vif, int id,
 {
 	struct wil6210_priv *wil = vif_to_wil(vif);
 
-	mutex_lock(&wil->p2p_wdev_mutex);
+	mutex_lock(&wil->vif_mutex);
 	if (vif->scan_request) {
 		struct wmi_scan_complete_event *data = d;
 		int status = le32_to_cpu(data->status);
@@ -814,7 +814,7 @@ static void wmi_evt_scan_complete(struct wil6210_vif *vif, int id,
 	} else {
 		wil_err(wil, "SCAN_COMPLETE while not scanning\n");
 	}
-	mutex_unlock(&wil->p2p_wdev_mutex);
+	mutex_unlock(&wil->vif_mutex);
 }
 
 static void wmi_evt_connect(struct wil6210_vif *vif, int id, void *d, int len)