bnx2x: fix panic when TX ring is full

[pandora-kernel.git] / drivers / net / ethernet / broadcom / bnx2x / bnx2x_cmn.c

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 27d6d6c..2c1a5c0 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -220,7 +220,7 @@ int bnx2x_tx_int(struct bnx2x *bp, struct bnx2x_fp_txdata *txdata)
 
                if ((netif_tx_queue_stopped(txq)) &&
                    (bp->state == BNX2X_STATE_OPEN) &&
-                   (bnx2x_tx_avail(bp, txdata) >= MAX_SKB_FRAGS + 3))
+                   (bnx2x_tx_avail(bp, txdata) >= MAX_SKB_FRAGS + 4))
                        netif_tx_wake_queue(txq);
 
                __netif_tx_unlock(txq);
@@ -2254,8 +2254,6 @@ int bnx2x_poll(struct napi_struct *napi, int budget)
 /* we split the first BD into headers and data BDs
  * to ease the pain of our fellow microcode engineers
  * we use one mapping for both BDs
- * So far this has only been observed to happen
- * in Other Operating Systems(TM)
  */
 static noinline u16 bnx2x_tx_split(struct bnx2x *bp,
                                   struct bnx2x_fp_txdata *txdata,
@@ -2906,7 +2904,7 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
        txdata->tx_bd_prod += nbd;
 
-       if (unlikely(bnx2x_tx_avail(bp, txdata) < MAX_SKB_FRAGS + 3)) {
+       if (unlikely(bnx2x_tx_avail(bp, txdata) < MAX_SKB_FRAGS + 4)) {
                netif_tx_stop_queue(txq);
 
                /* paired memory barrier is in bnx2x_tx_int(), we have to keep
@@ -2915,7 +2913,7 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
                smp_mb();
 
                fp->eth_q_stats.driver_xoff++;
-               if (bnx2x_tx_avail(bp, txdata) >= MAX_SKB_FRAGS + 3)
+               if (bnx2x_tx_avail(bp, txdata) >= MAX_SKB_FRAGS + 4)
                        netif_tx_wake_queue(txq);
        }
        txdata->tx_pkt++;