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Message-Id: <1377899369-23252-5-git-send-email-robherring2@gmail.com> Date: Fri, 30 Aug 2013 16:49:23 -0500 From: Rob Herring <robherring2@...il.com> To: netdev@...r.kernel.org Cc: Ben Hutchings <bhutchings@...arflare.com>, Lennert Buytenhek <buytenh@...tstofly.org>, Rob Herring <rob.herring@...xeda.com> Subject: [PATCH v3 05/11] net: calxedaxgmac: update ring buffer tx_head after barriers From: Rob Herring <rob.herring@...xeda.com> Ensure that the descriptor writes are visible before the ring buffer head is updated. Since writel is a barrier, we can simply update the head after the writel. Reported-by: Lennert Buytenhek <buytenh@...tstofly.org> Signed-off-by: Rob Herring <rob.herring@...xeda.com> --- drivers/net/ethernet/calxeda/xgmac.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c index 64854ad..f630855 100644 --- a/drivers/net/ethernet/calxeda/xgmac.c +++ b/drivers/net/ethernet/calxeda/xgmac.c @@ -1121,9 +1121,10 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev) wmb(); desc_set_tx_owner(first, desc_flags | TXDESC_FIRST_SEG); + writel(1, priv->base + XGMAC_DMA_TX_POLL); + priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ); - writel(1, priv->base + XGMAC_DMA_TX_POLL); if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) < MAX_SKB_FRAGS) netif_stop_queue(dev); -- 1.8.1.2 -- 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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