From: Eric Dumazet <edumazet@google.com>
Date: Mon, 11 Jun 2012 07:21:36 +0000 (+0000)
Subject: lpc_eth: fix tx completion
X-Git-Tag: upstream/snapshot3+hdmi~7236^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3f16da51b0e533871d22a29682f3c3969d4f7e22;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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
--- 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)