linux-kernel - [patch 129/149] ucc_geth: Fix full TX queue processing

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Date:	Thu, 01 Jul 2010 10:32:35 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jiajun Wu <b06378@...escale.com>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [patch 129/149] ucc_geth: Fix full TX queue processing

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jiajun Wu <b06378@...escale.com>

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@...escale.com>
Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/ucc_geth.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -3276,13 +3276,12 @@ static int ucc_geth_tx(struct net_device
 		/* 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 +

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