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@gmail.com>
Acked-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/net/ps3_gelic_net.c b/drivers/net/ps3_gelic_net.c
index 9652d10b015..94422fcc857 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__);
         }