ifb: should not use __dev_get_by_index() without locks

At this point (ri_tasklet()), RTNL or dev_base_lock are not held,
we must use dev_get_by_index() instead of __dev_get_by_index()
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ifb.c

@@ -98,12 +98,13 @@ static void ri_tasklet(unsigned long dev)
 		stats->tx_packets++;
 		stats->tx_bytes +=skb->len;
 
-		skb->dev = __dev_get_by_index(&init_net, skb->iif);
+		skb->dev = dev_get_by_index(&init_net, skb->iif);
 		if (!skb->dev) {
 			dev_kfree_skb(skb);
 			stats->tx_dropped++;
 			break;
 		}
+		dev_put(skb->dev);
 		skb->iif = _dev->ifindex;
 
 		if (from & AT_EGRESS) {