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path: root/drivers/net/bnx2x_main.c
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Diffstat (limited to 'drivers/net/bnx2x_main.c')
-rw-r--r--drivers/net/bnx2x_main.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index ed785a30e98..6c042a72d6c 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -893,7 +893,6 @@ static inline u16 bnx2x_tx_avail(struct bnx2x_fastpath *fp)
u16 prod;
u16 cons;
- barrier(); /* Tell compiler that prod and cons can change */
prod = fp->tx_bd_prod;
cons = fp->tx_bd_cons;
@@ -963,7 +962,7 @@ static int bnx2x_tx_int(struct bnx2x_fastpath *fp)
* start_xmit() will miss it and cause the queue to be stopped
* forever.
*/
- smp_wmb();
+ smp_mb();
/* TBD need a thresh? */
if (unlikely(netif_tx_queue_stopped(txq))) {
@@ -11429,9 +11428,12 @@ static netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(bnx2x_tx_avail(fp) < MAX_SKB_FRAGS + 3)) {
netif_tx_stop_queue(txq);
- /* We want bnx2x_tx_int to "see" the updated tx_bd_prod
- if we put Tx into XOFF state. */
+
+ /* paired memory barrier is in bnx2x_tx_int(), we have to keep
+ * ordering of set_bit() in netif_tx_stop_queue() and read of
+ * fp->bd_tx_cons */
smp_mb();
+
fp->eth_q_stats.driver_xoff++;
if (bnx2x_tx_avail(fp) >= MAX_SKB_FRAGS + 3)
netif_tx_wake_queue(txq);