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authorStanislaw Gruszka <sgruszka@redhat.com>2010-03-09 06:55:02 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-15 15:47:01 -0700
commit9baddeb8c6c7faa7da8706ad629f09ca221850c1 (patch)
treea313ee611dc6f77604dbf188e8ed9770df0ec409 /drivers/net/bnx2x_main.c
parent0efc22f3afa5d8f070a33fea06162d7d9d518e38 (diff)
bnx2x: change smp_mb() comment to conform the true
Access to fp->tx_bp_prod is protected by __netif_tx_lock, smp_mb() is not needed for that. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Eilon Greenstein <eilong@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bnx2x_main.c')
-rw-r--r--drivers/net/bnx2x_main.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c
index ae62b67aa59..6c042a72d6c 100644
--- a/drivers/net/bnx2x_main.c
+++ b/drivers/net/bnx2x_main.c
@@ -11428,9 +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);