commit 0ede7036a67cd605c3717824f76518f5913ca3af
Author: Patrick McHardy <kaber@trash.net>
Date:   Fri Jun 12 16:36:18 2009 +0200

    net: fix network drivers ndo_start_xmit() return values (part 4)
    
    Fix up WAN drivers that return an errno value to qdisc_restart(), causing
    qdisc_restart() to print a warning an requeue/retransmit the skb.
    
    - cycx_x25: intention appears to be to requeue the skb
    
    Does not compile cleanly for me even without this patch, so untested.
    
    Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/drivers/net/wan/cycx_x25.c b/drivers/net/wan/cycx_x25.c
index 35dea3b..f525f9f 100644
--- a/drivers/net/wan/cycx_x25.c
+++ b/drivers/net/wan/cycx_x25.c
@@ -615,7 +615,7 @@ static int cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
 		case WAN_DISCONNECTED:
 			if (cycx_x25_chan_connect(dev)) {
 				netif_stop_queue(dev);
-				return -EBUSY;
+				return NETDEV_TX_BUSY;
 			}
 			/* fall thru */
 		case WAN_CONNECTED:
@@ -624,7 +624,7 @@ static int cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
 			netif_stop_queue(dev);
 
 			if (cycx_x25_chan_send(dev, skb))
-				return -EBUSY;
+				return NETDEV_TX_BUSY;
 
 			break;
 		default:
@@ -656,7 +656,7 @@ static int cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
 		if (cycx_x25_chan_send(dev, skb)) {
 			/* prepare for future retransmissions */
 			skb_push(skb, 1);
-			return -EBUSY;
+			return NETDEV_TX_BUSY;
 		}
 	}