netdev - [net-next 08/13] bna: CQ Read Fix

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Message-ID: <1385013257-32745-9-git-send-email-rmody@brocade.com>
Date:	Wed, 20 Nov 2013 21:54:12 -0800
From:	Rasesh Mody <rmody@...cade.com>
To:	<davem@...emloft.net>
CC:	<netdev@...r.kernel.org>,
	<adapter_linux_open_src_team@...cade.COM>,
	Rasesh Mody <rmody@...cade.COM>
Subject: [net-next 08/13] bna: CQ Read Fix

Valid bit check for completion needs read fence so that it does not get
reordered with other loads.

Signed-off-by: Rasesh Mody <rmody@...cade.com>
---
 drivers/net/ethernet/brocade/bna/bnad.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c
index 6ae1d9a..cfdcfb6 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.c
+++ b/drivers/net/ethernet/brocade/bna/bnad.c
@@ -605,7 +605,11 @@ bnad_cq_process(struct bnad *bnad, struct bna_ccb *ccb, int budget)
 	cq = ccb->sw_q;
 	cmpl = &cq[ccb->producer_index];
 
-	while (cmpl->valid && (packets < budget)) {
+	while (packets < budget) {
+		if (!cmpl->valid)
+			break;
+		rmb();
+
 		BNA_UPDATE_PKT_CNT(pkt_rt, ntohs(cmpl->length));
 
 		if (bna_is_small_rxq(cmpl->rxq_id))
@@ -645,6 +649,7 @@ bnad_cq_process(struct bnad *bnad, struct bna_ccb *ccb, int budget)
 
 				if (!next_cmpl->valid)
 					break;
+				mb();
 
 				len = ntohs(next_cmpl->length);
 				flags = ntohl(next_cmpl->flags);
-- 
1.8.2.3

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