netdev - [PATCH 2/3] ps3_gelic: Fix start

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Date:	Tue, 12 Jul 2011 22:13:25 +0200
From:	Andre Heider <a.heider@...il.com>
To:	Geoff Levand <geoff@...radead.org>
Cc:	netdev@...r.kernel.org, cbe-oss-dev@...ts.ozlabs.org,
	Andre Heider <a.heider@...il.com>
Subject: [PATCH 2/3] ps3_gelic: Fix start_xmit kick error path

Revert to a proper state when gelic_card_kick_txdma() fails:
- Don't trigger BUG_ON when releasing the unsent tx descriptor
- Reset the tx chain head since the tail was not modified and
  hence not in sync
- Unlink the released descriptor bus address from its predecessor

Signed-off-by: Andre Heider <a.heider@...il.com>
---
 drivers/net/ps3_gelic_net.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ps3_gelic_net.c b/drivers/net/ps3_gelic_net.c
index 9652d10..94422fc 100644
--- a/drivers/net/ps3_gelic_net.c
+++ b/drivers/net/ps3_gelic_net.c
@@ -897,12 +897,16 @@ int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
 	if (gelic_card_kick_txdma(card, descr)) {
 		/*
 		 * kick failed.
-		 * release descriptors which were just prepared
+		 * release descriptor which was just prepared
 		 */
 		netdev->stats.tx_dropped++;
+		/* don't trigger BUG_ON() in gelic_descr_release_tx */
+		descr->data_status = cpu_to_be32(GELIC_DESCR_TX_TAIL);
 		gelic_descr_release_tx(card, descr);
-		gelic_descr_release_tx(card, descr->next);
-		card->tx_chain.tail = descr->next->next;
+		/* reset head */
+		card->tx_chain.head = descr;
+		/* reset hw termination */
+		descr->prev->next_descr_addr = 0;
 		dev_info(ctodev(card), "%s: kick failure\n", __func__);
 	}
 
-- 
1.7.5.4

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