netdev - [patch 06/21] ibmveth: Use lighter weight read memory barrier in ibmveth

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Message-Id: <20100904042831.2655.47418.sendpatchset@jupiter1-ltc-lp2.austin.ibm.com>
Date:	Fri, 03 Sep 2010 23:28:31 -0500
From:	Santiago Leon <santil@...ux.vnet.ibm.com>
To:	netdev@...r.kernel.org
Cc:	brking@...ux.vnet.ibm.com,
	Santiago Leon <santil@...ux.vnet.ibm.com>, anton@...ba.org
Subject: [patch 06/21] ibmveth: Use lighter weight read memory barrier in ibmveth_poll

We want to order the read in ibmveth_rxq_pending_buffer and the read of
ibmveth_rxq_buffer_valid which are both cacheable memory. smp_rmb() is good
enough for this.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: Santiago Leon <santil@...ux.vnet.ibm.com>
---

Index: net-next-2.6/drivers/net/ibmveth.c
===================================================================
ext-2.6.orig//drivers/net/ibmveth.c	2010-09-03 22:18:48.000000000 -0500
+++ net-next-2.6/drivers/net/ibmveth.c	2010-09-03 22:18:49.000000000 -0500
@@ -1010,7 +1010,7 @@ static int ibmveth_poll(struct napi_stru
 		if (!ibmveth_rxq_pending_buffer(adapter))
 			break;
 
-		rmb();
+		smp_rmb();
 		if (!ibmveth_rxq_buffer_valid(adapter)) {
 			wmb(); /* suggested by larson1 */
 			adapter->rx_invalid_buffer++;
--
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