lpc_eth: fix tx completion

__lpc_handle_xmit() has two bugs :

1) It can leak skbs in case TXSTATUS_ERROR is set

2) It can wake up txqueue while no slot was freed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Roland Stigge <stigge@antcom.de>
Tested-by: Roland Stigge <stigge@antcom.de>
Cc: Kevin Wells <kevin.wells@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 10febdc..083d671 100644 (file)
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -946,16 +946,16 @@ static void __lpc_handle_xmit(struct net_device *ndev)
                        /* Update stats */
                        ndev->stats.tx_packets++;
                        ndev->stats.tx_bytes += skb->len;
-
-                       /* Free buffer */
-                       dev_kfree_skb_irq(skb);
                }
+               dev_kfree_skb_irq(skb);
 
                txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
        }
 
-       if (netif_queue_stopped(ndev))
-               netif_wake_queue(ndev);
+       if (pldat->num_used_tx_buffs <= ENET_TX_DESC/2) {
+               if (netif_queue_stopped(ndev))
+                       netif_wake_queue(ndev);
+       }
 }
 
 static int __lpc_handle_recv(struct net_device *ndev, int budget)