net: treewide use of RCU_INIT_POINTER

rcu_assign_pointer(ptr, NULL) can be safely replaced by
RCU_INIT_POINTER(ptr, NULL)

(old rcu_assign_pointer() macro was testing the NULL value and could
omit the smp_wmb(), but this had to be removed because of compiler
warnings)
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2.c

@@ -409,7 +409,7 @@ static int bnx2_unregister_cnic(struct net_device *dev)
 	mutex_lock(&bp->cnic_lock);
 	cp->drv_state = 0;
 	bnapi->cnic_present = 0;
-	rcu_assign_pointer(bp->cnic_ops, NULL);
+	RCU_INIT_POINTER(bp->cnic_ops, NULL);
 	mutex_unlock(&bp->cnic_lock);
 	synchronize_rcu();
 	return 0;

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

@@ -11587,7 +11587,7 @@ static int bnx2x_unregister_cnic(struct net_device *dev)
 
 	mutex_lock(&bp->cnic_mutex);
 	cp->drv_state = 0;
-	rcu_assign_pointer(bp->cnic_ops, NULL);
+	RCU_INIT_POINTER(bp->cnic_ops, NULL);
 	mutex_unlock(&bp->cnic_mutex);
 	synchronize_rcu();
 	kfree(bp->cnic_kwq);

drivers/net/ethernet/broadcom/cnic.c

@@ -506,7 +506,7 @@ int cnic_unregister_driver(int ulp_type)
 	}
 	read_unlock(&cnic_dev_lock);
 
-	rcu_assign_pointer(cnic_ulp_tbl[ulp_type], NULL);
+	RCU_INIT_POINTER(cnic_ulp_tbl[ulp_type], NULL);
 
 	mutex_unlock(&cnic_lock);
 	synchronize_rcu();
@@ -579,7 +579,7 @@ static int cnic_unregister_device(struct cnic_dev *dev, int ulp_type)
 	}
 	mutex_lock(&cnic_lock);
 	if (rcu_dereference(cp->ulp_ops[ulp_type])) {
-		rcu_assign_pointer(cp->ulp_ops[ulp_type], NULL);
+		RCU_INIT_POINTER(cp->ulp_ops[ulp_type], NULL);
 		cnic_put(dev);
 	} else {
 		pr_err("%s: device not registered to this ulp type %d\n",
@@ -5134,7 +5134,7 @@ static void cnic_stop_hw(struct cnic_dev *dev)
 		}
 		cnic_shutdown_rings(dev);
 		clear_bit(CNIC_F_CNIC_UP, &dev->flags);
-		rcu_assign_pointer(cp->ulp_ops[CNIC_ULP_L4], NULL);
+		RCU_INIT_POINTER(cp->ulp_ops[CNIC_ULP_L4], NULL);
 		synchronize_rcu();
 		cnic_cm_shutdown(dev);
 		cp->stop_hw(dev);

drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c

@@ -1301,7 +1301,7 @@ int cxgb3_offload_activate(struct adapter *adapter)
 
 out_free_l2t:
 	t3_free_l2t(L2DATA(dev));
-	rcu_assign_pointer(dev->l2opt, NULL);
+	RCU_INIT_POINTER(dev->l2opt, NULL);
 out_free:
 	kfree(t);
 	return err;
@@ -1329,7 +1329,7 @@ void cxgb3_offload_deactivate(struct adapter *adapter)
 	rcu_read_lock();
 	d = L2DATA(tdev);
 	rcu_read_unlock();
-	rcu_assign_pointer(tdev->l2opt, NULL);
+	RCU_INIT_POINTER(tdev->l2opt, NULL);
 	call_rcu(&d->rcu_head, clean_l2_data);
 	if (t->nofail_skb)
 		kfree_skb(t->nofail_skb);

drivers/net/macvtap.c

@@ -145,8 +145,8 @@ static void macvtap_put_queue(struct macvtap_queue *q)
 	if (vlan) {
 		int index = get_slot(vlan, q);
 
-		rcu_assign_pointer(vlan->taps[index], NULL);
-		rcu_assign_pointer(q->vlan, NULL);
+		RCU_INIT_POINTER(vlan->taps[index], NULL);
+		RCU_INIT_POINTER(q->vlan, NULL);
 		sock_put(&q->sk);
 		--vlan->numvtaps;
 	}
@@ -223,8 +223,8 @@ static void macvtap_del_queues(struct net_device *dev)
 					      lockdep_is_held(&macvtap_lock));
 		if (q) {
 			qlist[j++] = q;
-			rcu_assign_pointer(vlan->taps[i], NULL);
-			rcu_assign_pointer(q->vlan, NULL);
+			RCU_INIT_POINTER(vlan->taps[i], NULL);
+			RCU_INIT_POINTER(q->vlan, NULL);
 			vlan->numvtaps--;
 		}
 	}

drivers/net/ppp/pptp.c

@@ -162,7 +162,7 @@ static void del_chan(struct pppox_sock *sock)
 {
 	spin_lock(&chan_lock);
 	clear_bit(sock->proto.pptp.src_addr.call_id, callid_bitmap);
-	rcu_assign_pointer(callid_sock[sock->proto.pptp.src_addr.call_id], NULL);
+	RCU_INIT_POINTER(callid_sock[sock->proto.pptp.src_addr.call_id], NULL);
 	spin_unlock(&chan_lock);
 	synchronize_rcu();
 }

drivers/net/team/team_mode_activebackup.c

@@ -56,7 +56,7 @@ static bool ab_transmit(struct team *team, struct sk_buff *skb)
 static void ab_port_leave(struct team *team, struct team_port *port)
 {
 	if (ab_priv(team)->active_port == port)
-		rcu_assign_pointer(ab_priv(team)->active_port, NULL);
+		RCU_INIT_POINTER(ab_priv(team)->active_port, NULL);
 }
 
 static int ab_active_port_get(struct team *team, void *arg)

drivers/net/wireless/ath/carl9170/main.c

@@ -446,7 +446,7 @@ static void carl9170_op_stop(struct ieee80211_hw *hw)
 
 	mutex_lock(&ar->mutex);
 	if (IS_ACCEPTING_CMD(ar)) {
-		rcu_assign_pointer(ar->beacon_iter, NULL);
+		RCU_INIT_POINTER(ar->beacon_iter, NULL);
 
 		carl9170_led_set_state(ar, 0);
 
@@ -678,7 +678,7 @@ static int carl9170_op_add_interface(struct ieee80211_hw *hw,
 		vif_priv->active = false;
 		bitmap_release_region(&ar->vif_bitmap, vif_id, 0);
 		ar->vifs--;
-		rcu_assign_pointer(ar->vif_priv[vif_id].vif, NULL);
+		RCU_INIT_POINTER(ar->vif_priv[vif_id].vif, NULL);
 		list_del_rcu(&vif_priv->list);
 		mutex_unlock(&ar->mutex);
 		synchronize_rcu();
@@ -716,7 +716,7 @@ static void carl9170_op_remove_interface(struct ieee80211_hw *hw,
 	WARN_ON(vif_priv->enable_beacon);
 	vif_priv->enable_beacon = false;
 	list_del_rcu(&vif_priv->list);
-	rcu_assign_pointer(ar->vif_priv[id].vif, NULL);
+	RCU_INIT_POINTER(ar->vif_priv[id].vif, NULL);
 
 	if (vif == main_vif) {
 		rcu_read_unlock();
@@ -1258,7 +1258,7 @@ static int carl9170_op_sta_add(struct ieee80211_hw *hw,
 		}
 
 		for (i = 0; i < CARL9170_NUM_TID; i++)
-			rcu_assign_pointer(sta_info->agg[i], NULL);
+			RCU_INIT_POINTER(sta_info->agg[i], NULL);
 
 		sta_info->ampdu_max_len = 1 << (3 + sta->ht_cap.ampdu_factor);
 		sta_info->ht_sta = true;
@@ -1285,7 +1285,7 @@ static int carl9170_op_sta_remove(struct ieee80211_hw *hw,
 			struct carl9170_sta_tid *tid_info;
 
 			tid_info = rcu_dereference(sta_info->agg[i]);
-			rcu_assign_pointer(sta_info->agg[i], NULL);
+			RCU_INIT_POINTER(sta_info->agg[i], NULL);
 
 			if (!tid_info)
 				continue;
@@ -1398,7 +1398,7 @@ static int carl9170_op_ampdu_action(struct ieee80211_hw *hw,
 			spin_unlock_bh(&ar->tx_ampdu_list_lock);
 		}
 
-		rcu_assign_pointer(sta_info->agg[tid], NULL);
+		RCU_INIT_POINTER(sta_info->agg[tid], NULL);
 		rcu_read_unlock();
 
 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);

net/core/netprio_cgroup.c

@@ -285,7 +285,7 @@ static int netprio_device_event(struct notifier_block *unused,
 		break;
 	case NETDEV_UNREGISTER:
 		old = rtnl_dereference(dev->priomap);
-		rcu_assign_pointer(dev->priomap, NULL);
+		RCU_INIT_POINTER(dev->priomap, NULL);
 		if (old)
 			kfree_rcu(old, rcu);
 		break;
@@ -332,7 +332,7 @@ static void __exit exit_cgroup_netprio(void)
 	rtnl_lock();
 	for_each_netdev(&init_net, dev) {
 		old = rtnl_dereference(dev->priomap);
-		rcu_assign_pointer(dev->priomap, NULL);
+		RCU_INIT_POINTER(dev->priomap, NULL);
 		if (old)
 			kfree_rcu(old, rcu);
 	}