From: Anton Blanchard <anton@samba.org>
Date: Tue, 7 Sep 2010 01:21:41 +0000 (-0700)
Subject: ibmveth: Use lighter weight read memory barrier in ibmveth_poll
X-Git-Tag: upstream/snapshot3+hdmi~12689^2~560
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f89e49e79f839dbe79364ec6cd7e2274ad11b120;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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@samba.org>
Signed-off-by: Santiago Leon <santil@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index c236c8a..aedcb18 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -1010,7 +1010,7 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
 		if (!ibmveth_rxq_pending_buffer(adapter))
 			break;
 
-		rmb();
+		smp_rmb();
 		if (!ibmveth_rxq_buffer_valid(adapter)) {
 			wmb(); /* suggested by larson1 */
 			adapter->rx_invalid_buffer++;