From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rasesh Mody Subject: [net-next 08/13] bna: CQ Read Fix Date: Sat, 7 Dec 2013 21:48:39 -0800 Message-ID: <1386481724-32367-9-git-send-email-rmody@brocade.com> References: <1386481724-32367-1-git-send-email-rmody@brocade.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , Rasesh Mody To: Return-path: Received: from mx0b-000f0801.pphosted.com ([67.231.152.113]:64481 "EHLO mx0b-000f0801.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751745Ab3LHFtb (ORCPT ); Sun, 8 Dec 2013 00:49:31 -0500 In-Reply-To: <1386481724-32367-1-git-send-email-rmody@brocade.com> Sender: netdev-owner@vger.kernel.org List-ID: Valid bit check for completion needs read fence, so that it does not get reordered with other loads. Signed-off-by: Rasesh Mody --- 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 508f5fc..cd29069 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