netxen: small xmit optimizations

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c
index f8164345e3b3..72aba634554a 100644
--- a/drivers/net/netxen/netxen_nic_init.c
+++ b/drivers/net/netxen/netxen_nic_init.c
@@ -955,6 +955,7 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter)
         int done = 0;
 
         last_consumer = adapter->last_cmd_consumer;
+        barrier(); /* cmd_consumer can change underneath */
         consumer = le32_to_cpu(*(adapter->cmd_consumer));
 
         while (last_consumer != consumer) {
@@ -1005,6 +1006,7 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter)
          * There is still a possible race condition and the host could miss an
          * interrupt. The card has to take care of this.
          */
+        barrier(); /* cmd_consumer can change underneath */
         consumer = le32_to_cpu(*(adapter->cmd_consumer));
         done = (last_consumer == consumer);