diff options
| author | Eilon Greenstein <eilong@broadcom.com> | 2009-03-02 07:59:24 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-02 22:32:38 -0800 |
| commit | 6044735d8ddd96bf23cf975bae8729c65479aa14 (patch) | |
| tree | 36fe481362fe7b5ee26edb55c2dcc52d96cc24ca /drivers/net/bnx2x_main.c | |
| parent | 0d1a8d2d7dd9f6588ed9544a9aa88fd9bd9467d3 (diff) | |
bnx2x: Reduce the likelihood of smb_mb
As the comment explains, this smb_mb is needed only if the queue is stopped
(which is unlikely) so the barrier can be moved to that location
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.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/net/bnx2x_main.c b/drivers/net/bnx2x_main.c index 5954bed60652..fbd0f88fc81b 100644 --- a/drivers/net/bnx2x_main.c +++ b/drivers/net/bnx2x_main.c @@ -916,18 +916,19 @@ static void bnx2x_tx_int(struct bnx2x_fastpath *fp, int work) fp->tx_pkt_cons = sw_cons; fp->tx_bd_cons = bd_cons; - /* Need to make the tx_bd_cons update visible to start_xmit() - * before checking for netif_tx_queue_stopped(). Without the - * memory barrier, there is a small possibility that start_xmit() - * will miss it and cause the queue to be stopped forever. - */ - smp_mb(); - /* TBD need a thresh? */ if (unlikely(netif_tx_queue_stopped(txq))) { __netif_tx_lock(txq, smp_processor_id()); + /* Need to make the tx_bd_cons update visible to start_xmit() + * before checking for netif_tx_queue_stopped(). Without the + * memory barrier, there is a small possibility that + * start_xmit() will miss it and cause the queue to be stopped + * forever. + */ + smp_mb(); + if ((netif_tx_queue_stopped(txq)) && (bp->state == BNX2X_STATE_OPEN) && (bnx2x_tx_avail(fp) >= MAX_SKB_FRAGS + 3)) |