staging: et131x: In et131x_tx(), don't return NETDEV_TX_BUSY, just drop the packet

Memory allocation errors do not denote NETDEV_TX_BUSY, simply drop
the packet silently with kfree_skb() and return NETDEV_TX_OK.

Also remove this item from the TODO list.
Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/et131x/README

@@ -10,7 +10,6 @@ driver as they did not build properly at the time.
 TODO:
 	- Look at reducing the number of spinlocks
 	- Simplify code in nic_rx_pkts(), when determining multicast_pkts_rcvd
-	- In et131x_tx(), don't return NETDEV_TX_BUSY, just drop the packet with kfree_skb().
 	- Reduce the number of split lines by careful consideration of variable names etc.
 
 Please send patches to:

drivers/staging/et131x/et131x.c

@@ -4212,7 +4212,6 @@ static void et131x_multicast(struct net_device *netdev)
 /* et131x_tx - The handler to tx a packet on the device */
 static netdev_tx_t et131x_tx(struct sk_buff *skb, struct net_device *netdev)
 {
-	int status = 0;
 	struct et131x_adapter *adapter = netdev_priv(netdev);
 	struct tx_ring *tx_ring = &adapter->tx_ring;
 
@@ -4224,43 +4223,23 @@ static netdev_tx_t et131x_tx(struct sk_buff *skb, struct net_device *netdev)
 	netdev->trans_start = jiffies;
 
 	/* TCB is not available */
-	if (tx_ring->used >= NUM_TCB) {
-		/* NOTE: If there's an error on send, no need to queue the
-		 * packet under Linux; if we just send an error up to the
-		 * netif layer, it will resend the skb to us.
-		 */
-		status = -ENOMEM;
-	} else {
-		/* We need to see if the link is up; if it's not, make the
-		 * netif layer think we're good and drop the packet
-		 */
+	if (tx_ring->used >= NUM_TCB)
+		goto drop_err;
+
 	if ((adapter->flags & FMP_ADAPTER_FAIL_SEND_MASK) ||
-		    !netif_carrier_ok(netdev)) {
-			dev_kfree_skb_any(skb);
-			skb = NULL;
+	    !netif_carrier_ok(netdev))
+		goto drop_err;
 
-			adapter->netdev->stats.tx_dropped++;
-		} else {
-			status = send_packet(skb, adapter);
-			if (status != 0 && status != -ENOMEM) {
-				/* On any other error, make netif think we're
-				 * OK and drop the packet
-				 */
+	if (send_packet(skb, adapter))
+		goto drop_err;
+
+	return NETDEV_TX_OK;
+
+drop_err:
 	dev_kfree_skb_any(skb);
 	skb = NULL;
 	adapter->netdev->stats.tx_dropped++;
-			}
-		}
-	}
-
-	/* Check status and manage the netif queue if necessary */
-	if (status != 0) {
-		if (status == -ENOMEM)
-			status = NETDEV_TX_BUSY;
-		else
-			status = NETDEV_TX_OK;
-	}
-	return status;
+	return NETDEV_TX_OK;
 }
 
 /* et131x_tx_timeout - Timeout handler