1 files changed, 37 insertions, 14 deletions

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index af3c56482c8..31afd712930 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -101,6 +101,11 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 
 	if (!ret) {
 		key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+		if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
+		      (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
+			key->local->crypto_tx_tailroom_needed_cnt--;
+
 		return 0;
 	}
 
@@ -156,6 +161,10 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
 			  key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
 
 	key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+	if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
+	      (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
+		key->local->crypto_tx_tailroom_needed_cnt++;
 }
 
 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
@@ -186,7 +195,7 @@ static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
 	assert_key_lock(sdata->local);
 
 	if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
-		key = sdata->keys[idx];
+		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 
 	if (uni)
 		rcu_assign_pointer(sdata->default_unicast_key, key);
@@ -213,7 +222,7 @@ __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
 
 	if (idx >= NUM_DEFAULT_KEYS &&
 	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
-		key = sdata->keys[idx];
+		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 
 	rcu_assign_pointer(sdata->default_mgmt_key, key);
 
@@ -257,9 +266,15 @@ static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 		else
 			idx = new->conf.keyidx;
 
-		defunikey = old && sdata->default_unicast_key == old;
-		defmultikey = old && sdata->default_multicast_key == old;
-		defmgmtkey = old && sdata->default_mgmt_key == old;
+		defunikey = old &&
+			old == key_mtx_dereference(sdata->local,
+						sdata->default_unicast_key);
+		defmultikey = old &&
+			old == key_mtx_dereference(sdata->local,
+						sdata->default_multicast_key);
+		defmgmtkey = old &&
+			old == key_mtx_dereference(sdata->local,
+						sdata->default_mgmt_key);
 
 		if (defunikey && !new)
 			__ieee80211_set_default_key(sdata, -1, true, false);
@@ -388,8 +403,10 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
 		ieee80211_aes_key_free(key->u.ccmp.tfm);
 	if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
 		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
-	if (key->local)
+	if (key->local) {
 		ieee80211_debugfs_key_remove(key);
+		key->local->crypto_tx_tailroom_needed_cnt--;
+	}
 
 	kfree(key);
 }
@@ -440,17 +457,19 @@ int ieee80211_key_link(struct ieee80211_key *key,
 	mutex_lock(&sdata->local->key_mtx);
 
 	if (sta && pairwise)
-		old_key = sta->ptk;
+		old_key = key_mtx_dereference(sdata->local, sta->ptk);
 	else if (sta)
-		old_key = sta->gtk[idx];
+		old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
 	else
-		old_key = sdata->keys[idx];
+		old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
 
 	__ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
 	__ieee80211_key_destroy(old_key);
 
 	ieee80211_debugfs_key_add(key);
 
+	key->local->crypto_tx_tailroom_needed_cnt++;
+
 	ret = ieee80211_key_enable_hw_accel(key);
 
 	mutex_unlock(&sdata->local->key_mtx);
@@ -458,8 +477,11 @@ int ieee80211_key_link(struct ieee80211_key *key,
 	return ret;
 }
 
-static void __ieee80211_key_free(struct ieee80211_key *key)
+void __ieee80211_key_free(struct ieee80211_key *key)
 {
+	if (!key)
+		return;
+
 	/*
 	 * Replace key with nothingness if it was ever used.
 	 */
@@ -473,9 +495,6 @@ static void __ieee80211_key_free(struct ieee80211_key *key)
 void ieee80211_key_free(struct ieee80211_local *local,
 			struct ieee80211_key *key)
 {
-	if (!key)
-		return;
-
 	mutex_lock(&local->key_mtx);
 	__ieee80211_key_free(key);
 	mutex_unlock(&local->key_mtx);
@@ -492,8 +511,12 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
 
 	mutex_lock(&sdata->local->key_mtx);
 
-	list_for_each_entry(key, &sdata->key_list, list)
+	sdata->local->crypto_tx_tailroom_needed_cnt = 0;
+
+	list_for_each_entry(key, &sdata->key_list, list) {
+		sdata->local->crypto_tx_tailroom_needed_cnt++;
 		ieee80211_key_enable_hw_accel(key);
+	}
 
 	mutex_unlock(&sdata->local->key_mtx);
 }