diff -uNpr linux-3.16.7.orig/net/packet/af_packet.c linux-3.16.7/net/packet/af_packet.c
--- linux-3.16.7.orig/net/packet/af_packet.c	2014-10-30 16:41:01.000000000 +0000
+++ linux-3.16.7/net/packet/af_packet.c	2015-04-04 08:31:20.311554717 +0000
@@ -2291,11 +2291,14 @@ static int tpacket_snd(struct packet_soc
 		tlen = dev->needed_tailroom;
 		skb = sock_alloc_send_skb(&po->sk,
 				hlen + tlen + sizeof(struct sockaddr_ll),
-				0, &err);
+				!need_wait, &err);
 
-		if (unlikely(skb == NULL))
+		if (skb == NULL) {
+			/* we assume the socket was initially writeable ... */
+			if (likely(len_sum > 0))
+				err = len_sum;
 			goto out_status;
-
+		}
 		tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
 					  addr, hlen);
 		if (tp_len > dev->mtu + dev->hard_header_len) {