From c8cd00742ce0e4c69069ff1f0804152b20048a58 Mon Sep 17 00:00:00 2001
From: Michael Chan <mchan@broadcom.com>
Date: Thu, 14 Dec 2006 15:56:32 -0800
Subject: [PATCH] --- yaml --- r: 44660 b: refs/heads/master c:
 faac9c4b753f420c02bdce0785d2657087830a12 h: refs/heads/master v: v3

---
 [refs]                   |  2 +-
 trunk/drivers/net/bnx2.c | 13 ++++++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/[refs] b/[refs]
index 6d96e6edba9f..ac19f798aac4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a3d384029aa304f8f3f5355d35f0ae274454f7cd
+refs/heads/master: faac9c4b753f420c02bdce0785d2657087830a12
diff --git a/trunk/drivers/net/bnx2.c b/trunk/drivers/net/bnx2.c
index 7d824cf8ee2d..f296c37f29b6 100644
--- a/trunk/drivers/net/bnx2.c
+++ b/trunk/drivers/net/bnx2.c
@@ -217,9 +217,16 @@ static inline u32 bnx2_tx_avail(struct bnx2 *bp)
 	u32 diff;
 
 	smp_mb();
-	diff = TX_RING_IDX(bp->tx_prod) - TX_RING_IDX(bp->tx_cons);
-	if (diff > MAX_TX_DESC_CNT)
-		diff = (diff & MAX_TX_DESC_CNT) - 1;
+
+	/* The ring uses 256 indices for 255 entries, one of them
+	 * needs to be skipped.
+	 */
+	diff = bp->tx_prod - bp->tx_cons;
+	if (unlikely(diff >= TX_DESC_CNT)) {
+		diff &= 0xffff;
+		if (diff == TX_DESC_CNT)
+			diff = MAX_TX_DESC_CNT;
+	}
 	return (bp->tx_ring_size - diff);
 }