ucc_geth: Fix full TX queue processing

commit 34692421bc7d6145ef383b014860f4fde10b7505 upstream.

commit 7583605b6d29f1f7f6fc505b883328089f3485ad ("ucc_geth: Fix empty
TX queue processing") fixed empty TX queue mishandling, but didn't
account another corner case: when TX queue becomes full.

Without this patch the driver will stop transmiting when TX queue
becomes full since 'bd == ugeth->txBd[txQ]' actually checks for
two things: queue empty or full.

Let's better check for NULL skb, which unambiguously signals an empty
queue.

Signed-off-by: Jiajun Wu <b06378@freescale.com>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index 5077fd90446b70c1d35769540209ef605a985644..b4b25ffa3ab7c6a199852604997d00869eda1f1d 100644 (file)
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -3276,13 +3276,12 @@ static int ucc_geth_tx(struct net_device *dev, u8 txQ)
                /* Handle the transmitted buffer and release */
                /* the BD to be used with the current frame  */
 
-               if (bd == ugeth->txBd[txQ]) /* queue empty? */
+               skb = ugeth->tx_skbuff[txQ][ugeth->skb_dirtytx[txQ]];
+               if (!skb)
                        break;
 
                dev->stats.tx_packets++;
 
-               skb = ugeth->tx_skbuff[txQ][ugeth->skb_dirtytx[txQ]];
-
                if (skb_queue_len(&ugeth->rx_recycle) < RX_BD_RING_LEN &&
                             skb_recycle_check(skb,
                                    ugeth->ug_info->uf_info.max_rx_buf_length +