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Message-ID: <1328491480-13030-2-git-send-email-mchan@broadcom.com> Date: Sun, 5 Feb 2012 17:24:39 -0800 From: "Michael Chan" <mchan@...adcom.com> To: davem@...emloft.net cc: netdev@...r.kernel.org Subject: [PATCH 2/3 net-next] bnx2: Add missing memory barrier in bnx2_start_xmit() From: Vlad Zolotarov <vlad@...lemp.com> Sync DMA descriptor before hitting the TX mailbox for weak memory model CPUs. There has been discussions several years ago about this. Some believe that writel() should guarantee ordering. Others want explicit barriers if necessary. Today writel() does not have the ordering guarantee and many other drivers use explicit barriers. Signed-off-by: Vlad Zolotarov <vlad@...lemp.com> Signed-off-by: Michael Chan <mchan@...adcom.com> --- drivers/net/ethernet/broadcom/bnx2.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c index 2ab31da..7105989 100644 --- a/drivers/net/ethernet/broadcom/bnx2.c +++ b/drivers/net/ethernet/broadcom/bnx2.c @@ -6565,6 +6565,9 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev) } txbd->tx_bd_vlan_tag_flags |= TX_BD_FLAGS_END; + /* Sync BD data before updating TX mailbox */ + wmb(); + netdev_tx_sent_queue(txq, skb->len); prod = NEXT_TX_BD(prod); -- 1.6.4.GIT -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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