cxgb4i: Handle dst_get_neighbour_noref() returning NULL.

Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NRoland Dreier <roland@purestorage.com>

drivers/scsi/cxgbi/cxgb4i/cxgb4i.c

@@ -1127,6 +1127,7 @@ static int init_act_open(struct cxgbi_sock *csk)
 	struct net_device *ndev = cdev->ports[csk->port_id];
 	struct port_info *pi = netdev_priv(ndev);
 	struct sk_buff *skb = NULL;
+	struct neighbour *n;
 	unsigned int step;
 
 	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
@@ -1141,7 +1142,12 @@ static int init_act_open(struct cxgbi_sock *csk)
 	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
 	cxgbi_sock_get(csk);
 
-	csk->l2t = cxgb4_l2t_get(lldi->l2t, dst_get_neighbour_noref(csk->dst), ndev, 0);
+	n = dst_get_neighbour_noref(csk->dst);
+	if (!n) {
+		pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
+		goto rel_resource;
+	}
+	csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
 	if (!csk->l2t) {
 		pr_err("%s, cannot alloc l2t.\n", ndev->name);
 		goto rel_resource;