netdev: Do not use TX lock to protect address lists.

Now that we have a specific lock to protect the network
device unicast and multicast lists, remove extraneous
grabs of the TX lock in cases where the code only needs
address list protection.

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 28 insertions, 60 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index ef1502d..9b49f74 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2981,11 +2981,9 @@ void __dev_set_rx_mode(struct net_device *dev)
 
 void dev_set_rx_mode(struct net_device *dev)
 {
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 	__dev_set_rx_mode(dev);
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 }
 
 int __dev_addr_delete(struct dev_addr_list **list, int *count,
@@ -3063,13 +3061,11 @@ int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
 
 	ASSERT_RTNL();
 
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 	err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
 	if (!err)
 		__dev_set_rx_mode(dev);
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 	return err;
 }
 EXPORT_SYMBOL(dev_unicast_delete);
@@ -3091,13 +3087,11 @@ int dev_unicast_add(struct net_device *dev, void *addr, int alen)
 
 	ASSERT_RTNL();
 
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 	err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
 	if (!err)
 		__dev_set_rx_mode(dev);
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 	return err;
 }
 EXPORT_SYMBOL(dev_unicast_add);
@@ -3164,14 +3158,12 @@ int dev_unicast_sync(struct net_device *to, struct net_device *from)
 {
 	int err = 0;
 
-	netif_tx_lock_bh(to);
-	netif_addr_lock(to);
+	netif_addr_lock_bh(to);
 	err = __dev_addr_sync(&to->uc_list, &to->uc_count,
 			      &from->uc_list, &from->uc_count);
 	if (!err)
 		__dev_set_rx_mode(to);
-	netif_addr_unlock(to);
-	netif_tx_unlock_bh(to);
+	netif_addr_unlock_bh(to);
 	return err;
 }
 EXPORT_SYMBOL(dev_unicast_sync);
@@ -3187,9 +3179,7 @@ EXPORT_SYMBOL(dev_unicast_sync);
  */
 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
 {
-	netif_tx_lock_bh(from);
-	netif_addr_lock(from);
-	netif_tx_lock_bh(to);
+	netif_addr_lock_bh(from);
 	netif_addr_lock(to);
 
 	__dev_addr_unsync(&to->uc_list, &to->uc_count,
@@ -3197,9 +3187,7 @@ void dev_unicast_unsync(struct net_device *to, struct net_device *from)
 	__dev_set_rx_mode(to);
 
 	netif_addr_unlock(to);
-	netif_tx_unlock_bh(to);
-	netif_addr_unlock(from);
-	netif_tx_unlock_bh(from);
+	netif_addr_unlock_bh(from);
 }
 EXPORT_SYMBOL(dev_unicast_unsync);
 
@@ -3219,8 +3207,7 @@ static void __dev_addr_discard(struct dev_addr_list **list)
 
 static void dev_addr_discard(struct net_device *dev)
 {
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 
 	__dev_addr_discard(&dev->uc_list);
 	dev->uc_count = 0;
@@ -3228,8 +3215,7 @@ static void dev_addr_discard(struct net_device *dev)
 	__dev_addr_discard(&dev->mc_list);
 	dev->mc_count = 0;
 
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 }
 
 unsigned dev_get_flags(const struct net_device *dev)
diff --git a/net/core/dev_mcast.c b/net/core/dev_mcast.c
index b6b2a12..5402b3b 100644
--- a/net/core/dev_mcast.c
+++ b/net/core/dev_mcast.c
@@ -72,8 +72,7 @@ int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
 {
 	int err;
 
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 	err = __dev_addr_delete(&dev->mc_list, &dev->mc_count,
 				addr, alen, glbl);
 	if (!err) {
@@ -84,8 +83,7 @@ int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
 
 		__dev_set_rx_mode(dev);
 	}
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 	return err;
 }
 
@@ -97,13 +95,11 @@ int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
 {
 	int err;
 
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 	err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
 	if (!err)
 		__dev_set_rx_mode(dev);
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 	return err;
 }
 
@@ -123,14 +119,12 @@ int dev_mc_sync(struct net_device *to, struct net_device *from)
 {
 	int err = 0;
 
-	netif_tx_lock_bh(to);
-	netif_addr_lock(to);
+	netif_addr_lock_bh(to);
 	err = __dev_addr_sync(&to->mc_list, &to->mc_count,
 			      &from->mc_list, &from->mc_count);
 	if (!err)
 		__dev_set_rx_mode(to);
-	netif_addr_unlock(to);
-	netif_tx_unlock_bh(to);
+	netif_addr_unlock_bh(to);
 
 	return err;
 }
@@ -149,9 +143,7 @@ EXPORT_SYMBOL(dev_mc_sync);
  */
 void dev_mc_unsync(struct net_device *to, struct net_device *from)
 {
-	netif_tx_lock_bh(from);
-	netif_addr_lock(from);
-	netif_tx_lock_bh(to);
+	netif_addr_lock_bh(from);
 	netif_addr_lock(to);
 
 	__dev_addr_unsync(&to->mc_list, &to->mc_count,
@@ -159,9 +151,7 @@ void dev_mc_unsync(struct net_device *to, struct net_device *from)
 	__dev_set_rx_mode(to);
 
 	netif_addr_unlock(to);
-	netif_tx_unlock_bh(to);
-	netif_addr_unlock(from);
-	netif_tx_unlock_bh(from);
+	netif_addr_unlock_bh(from);
 }
 EXPORT_SYMBOL(dev_mc_unsync);
 
@@ -174,8 +164,7 @@ static int dev_mc_seq_show(struct seq_file *seq, void *v)
 	if (v == SEQ_START_TOKEN)
 		return 0;
 
-	netif_tx_lock_bh(dev);
-	netif_addr_lock(dev);
+	netif_addr_lock_bh(dev);
 	for (m = dev->mc_list; m; m = m->next) {
 		int i;
 
@@ -187,8 +176,7 @@ static int dev_mc_seq_show(struct seq_file *seq, void *v)
 
 		seq_putc(seq, '\n');
 	}
-	netif_addr_unlock(dev);
-	netif_tx_unlock_bh(dev);
+	netif_addr_unlock_bh(dev);
 	return 0;
 }
 
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 095b7d9..af0056e 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -291,11 +291,9 @@ static int ieee80211_open(struct net_device *dev)
 		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 			local->fif_other_bss++;
 
-		netif_tx_lock_bh(local->mdev);
-		netif_addr_lock(local->mdev);
+		netif_addr_lock_bh(local->mdev);
 		ieee80211_configure_filter(local);
-		netif_addr_unlock(local->mdev);
-		netif_tx_unlock_bh(local->mdev);
+		netif_addr_unlock_bh(local->mdev);
 		break;
 	case IEEE80211_IF_TYPE_STA:
 	case IEEE80211_IF_TYPE_IBSS:
@@ -492,11 +490,9 @@ static int ieee80211_stop(struct net_device *dev)
 		if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 			local->fif_other_bss--;
 
-		netif_tx_lock_bh(local->mdev);
-		netif_addr_lock(local->mdev);
+		netif_addr_lock_bh(local->mdev);
 		ieee80211_configure_filter(local);
-		netif_addr_unlock(local->mdev);
-		netif_tx_unlock_bh(local->mdev);
+		netif_addr_unlock_bh(local->mdev);
 		break;
 	case IEEE80211_IF_TYPE_MESH_POINT:
 	case IEEE80211_IF_TYPE_STA:
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 1232ba2..d7c371e 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4064,16 +4064,14 @@ static int ieee80211_sta_start_scan(struct net_device *dev,
 	local->scan_band = IEEE80211_BAND_2GHZ;
 	local->scan_dev = dev;
 
-	netif_tx_lock_bh(local->mdev);
-	netif_addr_lock(local->mdev);
+	netif_addr_lock_bh(local->mdev);
 	local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
 	local->ops->configure_filter(local_to_hw(local),
 				     FIF_BCN_PRBRESP_PROMISC,
 				     &local->filter_flags,
 				     local->mdev->mc_count,
 				     local->mdev->mc_list);
-	netif_addr_unlock(local->mdev);
-	netif_tx_unlock_bh(local->mdev);
+	netif_addr_unlock_bh(local->mdev);
 
 	/* TODO: start scan as soon as all nullfunc frames are ACKed */
 	queue_delayed_work(local->hw.workqueue, &local->scan_work,