mlx4_en: Handle page allocation failure during receive

If we failed to allocate new fragments for receive buffer,
the packet should be dropped and packets should be reused.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/mlx4/en_rx.c b/drivers/net/mlx4/en_rx.c
index 0cbb78ca7b29ad100f89553ab2bd17693cff3c89..7942c4d3cd8835dd2bf29d6522e4a1f2ab92a099 100644 (file)
--- a/drivers/net/mlx4/en_rx.c
+++ b/drivers/net/mlx4/en_rx.c
@@ -610,6 +610,10 @@ static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
                used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
                                                      skb_shinfo(skb)->frags,
                                                      page_alloc, length);
+               if (unlikely(!used_frags)) {
+                       kfree_skb(skb);
+                       return NULL;
+               }
                skb_shinfo(skb)->nr_frags = used_frags;
 
                /* Copy headers into the skb linear buffer */