wifi: mac80211: remove key_mtx

We now hold the wiphy mutex everywhere that we use or
needed the key_mtx, so we don't need this mutex any
more. Remove it.

Most of this change was done automatically with spatch.

Signed-off-by: Johannes Berg <[e-mail]>

net/mac80211/cfg.c

···
 	if (sta->ptk_idx == key_idx)
 		return 0;
 
-	mutex_lock(&local->key_mtx);
-	key = key_mtx_dereference(local, sta->ptk[key_idx]);
+	key = wiphy_dereference(local->hw.wiphy, sta->ptk[key_idx]);
 
 	if (key && key->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX)
 		ret = ieee80211_set_tx_key(key);
 
-	mutex_unlock(&local->key_mtx);
 	return ret;
 }
 
···
 		}
 
 		if (pairwise && key_idx < NUM_DEFAULT_KEYS)
-			return rcu_dereference_check_key_mtx(local,
-							     sta->ptk[key_idx]);
+			return wiphy_dereference(local->hw.wiphy,
+						 sta->ptk[key_idx]);
 
 		if (!pairwise &&
 		    key_idx < NUM_DEFAULT_KEYS +
 			      NUM_DEFAULT_MGMT_KEYS +
 			      NUM_DEFAULT_BEACON_KEYS)
-			return rcu_dereference_check_key_mtx(local,
-							     link_sta->gtk[key_idx]);
+			return wiphy_dereference(local->hw.wiphy,
+						 link_sta->gtk[key_idx]);
 
 		return NULL;
 	}
 
 	if (pairwise && key_idx < NUM_DEFAULT_KEYS)
-		return rcu_dereference_check_key_mtx(local,
-						     sdata->keys[key_idx]);
+		return wiphy_dereference(local->hw.wiphy, sdata->keys[key_idx]);
 
-	key = rcu_dereference_check_key_mtx(local, link->gtk[key_idx]);
+	key = wiphy_dereference(local->hw.wiphy, link->gtk[key_idx]);
 	if (key)
 		return key;
 
 	/* or maybe it was a WEP key */
 	if (key_idx < NUM_DEFAULT_KEYS)
-		return rcu_dereference_check_key_mtx(local, sdata->keys[key_idx]);
+		return wiphy_dereference(local->hw.wiphy, sdata->keys[key_idx]);
 
 	return NULL;
 }
···
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_key *key;
-	int ret;
 
 	lockdep_assert_wiphy(local->hw.wiphy);
 
-	mutex_lock(&local->key_mtx);
-
 	key = ieee80211_lookup_key(sdata, link_id, key_idx, pairwise, mac_addr);
-	if (!key) {
-		ret = -ENOENT;
-		goto out_unlock;
-	}
+	if (!key)
+		return -ENOENT;
 
 	ieee80211_key_free(key, sdata->vif.type == NL80211_IFTYPE_STATION);
 
-	ret = 0;
- out_unlock:
-	mutex_unlock(&local->key_mtx);
-
-	return ret;
+	return 0;
 }
 
 static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,

net/mac80211/debugfs_key.c

···
  * Copyright (c) 2006	Jiri Benc <[e-mail]>
  * Copyright 2007	Johannes Berg <[e-mail]>
  * Copyright (C) 2015	Intel Deutschland GmbH
- * Copyright (C) 2021-2022   Intel Corporation
+ * Copyright (C) 2021-2023   Intel Corporation
  */
 
 #include <linux/kobject.h>
···
 	if (!sdata->vif.debugfs_dir)
 		return;
 
-	lockdep_assert_held(&sdata->local->key_mtx);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	debugfs_remove(sdata->debugfs.default_unicast_key);
 	sdata->debugfs.default_unicast_key = NULL;
 
 	if (sdata->default_unicast_key) {
-		key = key_mtx_dereference(sdata->local,
-					  sdata->default_unicast_key);
+		key = wiphy_dereference(sdata->local->hw.wiphy,
+					sdata->default_unicast_key);
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_unicast_key =
 			debugfs_create_symlink("default_unicast_key",
···
 	sdata->debugfs.default_multicast_key = NULL;
 
 	if (sdata->deflink.default_multicast_key) {
-		key = key_mtx_dereference(sdata->local,
-					  sdata->deflink.default_multicast_key);
+		key = wiphy_dereference(sdata->local->hw.wiphy,
+					sdata->deflink.default_multicast_key);
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_multicast_key =
 			debugfs_create_symlink("default_multicast_key",
···
 	if (!sdata->vif.debugfs_dir)
 		return;
 
-	key = key_mtx_dereference(sdata->local,
-				  sdata->deflink.default_mgmt_key);
+	key = wiphy_dereference(sdata->local->hw.wiphy,
+				sdata->deflink.default_mgmt_key);
 	if (key) {
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_mgmt_key =
···
 	if (!sdata->vif.debugfs_dir)
 		return;
 
-	key = key_mtx_dereference(sdata->local,
-				  sdata->deflink.default_beacon_key);
+	key = wiphy_dereference(sdata->local->hw.wiphy,
+				sdata->deflink.default_beacon_key);
 	if (key) {
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_beacon_key =

net/mac80211/ieee80211_i.h

···
 	struct list_head mon_list; /* only that are IFF_UP && !cooked */
 	struct mutex iflist_mtx;
 
-	/*
-	 * Key mutex, protects sdata's key_list and sta_info's
-	 * key pointers and ptk_idx (write access, they're RCU.)
-	 */
-	struct mutex key_mtx;
-
 	/* mutex for scan and work locking */
 	struct mutex mtx;
 

net/mac80211/iface.c

···
 	int res;
 	u32 hw_reconf_flags = 0;
 
+	lockdep_assert_wiphy(local->hw.wiphy);
+
 	switch (sdata->vif.type) {
 	case NL80211_IFTYPE_AP_VLAN: {
 		struct ieee80211_sub_if_data *master;
···
 		       sizeof(sdata->vif.hw_queue));
 		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 
-		mutex_lock(&local->key_mtx);
 		sdata->crypto_tx_tailroom_needed_cnt +=
 			master->crypto_tx_tailroom_needed_cnt;
-		mutex_unlock(&local->key_mtx);
 
 		break;
 		}

net/mac80211/key.c

···
 
 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 
-static void assert_key_lock(struct ieee80211_local *local)
-{
-	lockdep_assert_held(&local->key_mtx);
-}
-
 static void
 update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
 {
···
 		return;
 
 	/* crypto_tx_tailroom_needed_cnt is protected by this */
-	assert_key_lock(sdata->local);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	rcu_read_lock();
 
···
 	 * http://mid.gmane.org/[e-mail]
 	 */
 
-	assert_key_lock(sdata->local);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	update_vlan_tailroom_need_count(sdata, 1);
 
···
 static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
 					 int delta)
 {
-	assert_key_lock(sdata->local);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
 
···
 	int ret = -EOPNOTSUPP;
 
 	might_sleep();
+	lockdep_assert_wiphy(key->local->hw.wiphy);
 
 	if (key->flags & KEY_FLAG_TAINTED) {
 		/* If we get here, it's during resume and the key is
···
 
 	if (!key->local->ops->set_key)
 		goto out_unsupported;
-
-	assert_key_lock(key->local);
 
 	sta = key->sta;
 
···
 	if (!key || !key->local->ops->set_key)
 		return;
 
-	assert_key_lock(key->local);
-
 	if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 		return;
 
 	sta = key->sta;
 	sdata = key->sdata;
+
+	lockdep_assert_wiphy(key->local->hw.wiphy);
 
 	if (key->conf.link_id >= 0 && sdata->vif.active_links &&
 	    !(sdata->vif.active_links & BIT(key->conf.link_id)))
···
 	struct sta_info *sta = key->sta;
 	struct ieee80211_local *local = key->local;
 
-	assert_key_lock(local);
+	lockdep_assert_wiphy(local->hw.wiphy);
 
 	set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
 
···
 	struct sta_info *sta = new->sta;
 	int i;
 
-	assert_key_lock(local);
+	lockdep_assert_wiphy(local->hw.wiphy);
 
 	if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
 		/* Extended Key ID key install, initial one or rekey */
···
 	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct ieee80211_key *key = NULL;
 
-	assert_key_lock(sdata->local);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	if (idx >= 0 && idx < NUM_DEFAULT_KEYS) {
-		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
+		key = wiphy_dereference(sdata->local->hw.wiphy,
+					sdata->keys[idx]);
 		if (!key)
-			key = key_mtx_dereference(sdata->local, link->gtk[idx]);
+			key = wiphy_dereference(sdata->local->hw.wiphy,
+						link->gtk[idx]);
 	}
 
 	if (uni) {
···
 void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
 			       bool uni, bool multi)
 {
-	mutex_lock(&link->sdata->local->key_mtx);
+	lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
+
 	__ieee80211_set_default_key(link, idx, uni, multi);
-	mutex_unlock(&link->sdata->local->key_mtx);
 }
 
 static void
···
 	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct ieee80211_key *key = NULL;
 
-	assert_key_lock(sdata->local);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	if (idx >= NUM_DEFAULT_KEYS &&
 	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
-		key = key_mtx_dereference(sdata->local, link->gtk[idx]);
+		key = wiphy_dereference(sdata->local->hw.wiphy,
+					link->gtk[idx]);
 
 	rcu_assign_pointer(link->default_mgmt_key, key);
 
···
 void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
 				    int idx)
 {
-	mutex_lock(&link->sdata->local->key_mtx);
+	lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
+
 	__ieee80211_set_default_mgmt_key(link, idx);
-	mutex_unlock(&link->sdata->local->key_mtx);
 }
 
 static void
···
 	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct ieee80211_key *key = NULL;
 
-	assert_key_lock(sdata->local);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
 	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
 	    NUM_DEFAULT_BEACON_KEYS)
-		key = key_mtx_dereference(sdata->local, link->gtk[idx]);
+		key = wiphy_dereference(sdata->local->hw.wiphy,
+					link->gtk[idx]);
 
 	rcu_assign_pointer(link->default_beacon_key, key);
 
···
 void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
 				      int idx)
 {
-	mutex_lock(&link->sdata->local->key_mtx);
+	lockdep_assert_wiphy(link->sdata->local->hw.wiphy);
+
 	__ieee80211_set_default_beacon_key(link, idx);
-	mutex_unlock(&link->sdata->local->key_mtx);
 }
 
 static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
···
 	int ret = 0;
 	bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
 	bool is_wep;
+
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	/* caller must provide at least one old/new */
 	if (WARN_ON(!new && !old))
···
 				ret = ieee80211_key_enable_hw_accel(new);
 		}
 	} else {
-		if (!new->local->wowlan) {
+		if (!new->local->wowlan)
 			ret = ieee80211_key_enable_hw_accel(new);
-		} else {
-			assert_key_lock(new->local);
+		else
 			new->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
-		}
 	}
 
 	if (ret)
···
 			ieee80211_check_fast_rx(sta);
 	} else {
 		defunikey = old &&
-			old == key_mtx_dereference(sdata->local,
-						sdata->default_unicast_key);
+			old == wiphy_dereference(sdata->local->hw.wiphy,
+						 sdata->default_unicast_key);
 		defmultikey = old &&
-			old == key_mtx_dereference(sdata->local,
-						   link->default_multicast_key);
+			old == wiphy_dereference(sdata->local->hw.wiphy,
+						 link->default_multicast_key);
 		defmgmtkey = old &&
-			old == key_mtx_dereference(sdata->local,
-						   link->default_mgmt_key);
+			old == wiphy_dereference(sdata->local->hw.wiphy,
+						 link->default_mgmt_key);
 		defbeaconkey = old &&
-			old == key_mtx_dereference(sdata->local,
-						   link->default_beacon_key);
+			old == wiphy_dereference(sdata->local->hw.wiphy,
+						 link->default_beacon_key);
 
 		if (defunikey && !new)
 			__ieee80211_set_default_key(link, -1, true, false);
···
 	 * can cause warnings to appear.
 	 */
 	bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
-	int ret = -EOPNOTSUPP;
+	int ret;
 
-	mutex_lock(&sdata->local->key_mtx);
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
 	if (sta && pairwise) {
 		struct ieee80211_key *alt_key;
 
-		old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
-		alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
+		old_key = wiphy_dereference(sdata->local->hw.wiphy,
+					    sta->ptk[idx]);
+		alt_key = wiphy_dereference(sdata->local->hw.wiphy,
+					    sta->ptk[idx ^ 1]);
 
 		/* The rekey code assumes that the old and new key are using
 		 * the same cipher. Enforce the assumption for pairwise keys.
 		 */
 		if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
 		    (old_key && old_key->conf.cipher != key->conf.cipher))
-			goto out;
+			return -EOPNOTSUPP;
 	} else if (sta) {
 		struct link_sta_info *link_sta = &sta->deflink;
 		int link_id = key->conf.link_id;
···
 		if (link_id >= 0) {
 			link_sta = rcu_dereference_protected(sta->link[link_id],
 							     lockdep_is_held(&sta->local->hw.wiphy->mtx));
-			if (!link_sta) {
-				ret = -ENOLINK;
-				goto out;
-			}
+			if (!link_sta)
+				return -ENOLINK;
 		}
 
-		old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]);
+		old_key = wiphy_dereference(sdata->local->hw.wiphy,
+					    link_sta->gtk[idx]);
 	} else {
 		if (idx < NUM_DEFAULT_KEYS)
-			old_key = key_mtx_dereference(sdata->local,
-						      sdata->keys[idx]);
+			old_key = wiphy_dereference(sdata->local->hw.wiphy,
+						    sdata->keys[idx]);
 		if (!old_key)
-			old_key = key_mtx_dereference(sdata->local,
-						      link->gtk[idx]);
+			old_key = wiphy_dereference(sdata->local->hw.wiphy,
+						    link->gtk[idx]);
 	}
 
 	/* Non-pairwise keys must also not switch the cipher on rekey */
 	if (!pairwise) {
 		if (old_key && old_key->conf.cipher != key->conf.cipher)
-			goto out;
+			return -EOPNOTSUPP;
 	}
 
 	/*
···
 	 */
 	if (ieee80211_key_identical(sdata, old_key, key)) {
 		ieee80211_key_free_unused(key);
-		ret = 0;
-		goto out;
+		return 0;
 	}
 
 	key->local = sdata->local;
···
 	} else {
 		ieee80211_key_free(key, delay_tailroom);
 	}
-
- out:
-	mutex_unlock(&sdata->local->key_mtx);
 
 	return ret;
 }
···
 
 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
-	mutex_lock(&sdata->local->key_mtx);
-
 	sdata->crypto_tx_tailroom_needed_cnt = 0;
 	sdata->crypto_tx_tailroom_pending_dec = 0;
 
···
 			ieee80211_key_enable_hw_accel(key);
 		}
 	}
-
-	mutex_unlock(&sdata->local->key_mtx);
 }
 
 void ieee80211_iter_keys(struct ieee80211_hw *hw,
···
 
 	lockdep_assert_wiphy(hw->wiphy);
 
-	mutex_lock(&local->key_mtx);
 	if (vif) {
 		sdata = vif_to_sdata(vif);
 		list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
···
 				     key->sta ? &key->sta->sta : NULL,
 				     &key->conf, iter_data);
 	}
-	mutex_unlock(&local->key_mtx);
 }
 EXPORT_SYMBOL(ieee80211_iter_keys);
 
···
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_key *key, *tmp;
 
-	mutex_lock(&local->key_mtx);
+	lockdep_assert_wiphy(local->hw.wiphy);
+
 	list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
 		if (key->conf.link_id != link->link_id)
 			continue;
···
 				      key, NULL);
 		list_add_tail(&key->list, keys);
 	}
-	mutex_unlock(&local->key_mtx);
 }
 
 void ieee80211_free_key_list(struct ieee80211_local *local,
···
 {
 	struct ieee80211_key *key, *tmp;
 
-	mutex_lock(&local->key_mtx);
+	lockdep_assert_wiphy(local->hw.wiphy);
+
 	list_for_each_entry_safe(key, tmp, keys, list)
 		__ieee80211_key_destroy(key, false);
-	mutex_unlock(&local->key_mtx);
 }
 
 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
···
 	wiphy_delayed_work_cancel(local->hw.wiphy,
 				  &sdata->dec_tailroom_needed_wk);
 
-	mutex_lock(&local->key_mtx);
+	lockdep_assert_wiphy(local->hw.wiphy);
 
 	ieee80211_free_keys_iface(sdata, &keys);
 
···
 			WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
 				     vlan->crypto_tx_tailroom_pending_dec);
 	}
-
-	mutex_unlock(&local->key_mtx);
 }
 
 void ieee80211_free_sta_keys(struct ieee80211_local *local,
···
 	struct ieee80211_key *key;
 	int i;
 
-	mutex_lock(&local->key_mtx);
+	lockdep_assert_wiphy(local->hw.wiphy);
+
 	for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
-		key = key_mtx_dereference(local, sta->deflink.gtk[i]);
+		key = wiphy_dereference(local->hw.wiphy, sta->deflink.gtk[i]);
 		if (!key)
 			continue;
 		ieee80211_key_replace(key->sdata, NULL, key->sta,
···
 	}
 
 	for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
-		key = key_mtx_dereference(local, sta->ptk[i]);
+		key = wiphy_dereference(local->hw.wiphy, sta->ptk[i]);
 		if (!key)
 			continue;
 		ieee80211_key_replace(key->sdata, NULL, key->sta,
···
 		__ieee80211_key_destroy(key, key->sdata->vif.type ==
 					NL80211_IFTYPE_STATION);
 	}
-
-	mutex_unlock(&local->key_mtx);
 }
 
 void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy,
···
 	 * within an ESS this usually won't happen.
 	 */
 
-	mutex_lock(&sdata->local->key_mtx);
 	decrease_tailroom_need_count(sdata,
 				     sdata->crypto_tx_tailroom_pending_dec);
 	sdata->crypto_tx_tailroom_pending_dec = 0;
-	mutex_unlock(&sdata->local->key_mtx);
 }
 
 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
···
 
 	key = container_of(keyconf, struct ieee80211_key, conf);
 
-	assert_key_lock(key->local);
+	lockdep_assert_wiphy(key->local->hw.wiphy);
 
 	/*
 	 * if key was uploaded, we assume the driver will/has remove(d)

net/mac80211/key.h

···
 int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
 			       unsigned long del_links_mask,
 			       unsigned long add_links_mask);
-
-#define key_mtx_dereference(local, ref) \
-	rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
-#define rcu_dereference_check_key_mtx(local, ref) \
-	rcu_dereference_check(ref, lockdep_is_held(&((local)->key_mtx)))
-
 void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy,
 				    struct wiphy_work *wk);
 

net/mac80211/link.c

···
 
 	sdata_assert_lock(sdata);
 	lockdep_assert_wiphy(local->hw.wiphy);
+
 	mutex_lock(&local->mtx);
-	mutex_lock(&local->key_mtx);
 	old_active = sdata->vif.active_links;
 	if (old_active & active_links) {
 		/*
···
 		/* otherwise switch directly */
 		ret = _ieee80211_set_active_links(sdata, active_links);
 	}
-	mutex_unlock(&local->key_mtx);
 	mutex_unlock(&local->mtx);
 
 	return ret;

net/mac80211/main.c

···
 	mutex_init(&local->iflist_mtx);
 	mutex_init(&local->mtx);
 
-	mutex_init(&local->key_mtx);
 	spin_lock_init(&local->filter_lock);
 	spin_lock_init(&local->rx_path_lock);
 	spin_lock_init(&local->queue_stop_reason_lock);

net/mac80211/util.c

···
 	sdata = vif_to_sdata(vif);
 	local = sdata->local;
 
+	lockdep_assert_wiphy(local->hw.wiphy);
+
 	if (WARN_ON(flag & IEEE80211_SDATA_DISCONNECT_RESUME &&
 		    !local->resuming))
 		return;
···
 
 	sdata->flags |= flag;
 
-	mutex_lock(&local->key_mtx);
 	list_for_each_entry(key, &sdata->key_list, list)
 		key->flags |= KEY_FLAG_TAINTED;
-	mutex_unlock(&local->key_mtx);
 }
 
 void ieee80211_hw_restart_disconnect(struct ieee80211_vif *vif)