From eb0dc4bb2e22c04964d6e9545e86f629f117108b Mon Sep 17 00:00:00 2001 From: Shiraz Hashim Date: Sun, 17 Jul 2011 20:54:08 +0000 Subject: [PATCH] stmmac: add memory barriers at appropriate places This patch, provided by ST SPEAr developers, has fixed a problem raised on ARM CA9 where happened that the dma_transmission was enabled before the dma descriptors were properly filled. To guarantee this data memory barriers have been explicity used in the driver. Signed-off-by: Shiraz Hashim Signed-off-by: Giuseppe Cavallaro Signed-off-by: David S. Miller --- drivers/net/stmmac/stmmac_main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c index d4adc806f6f..c8c9e5bc660 100644 --- a/drivers/net/stmmac/stmmac_main.c +++ b/drivers/net/stmmac/stmmac_main.c @@ -1045,6 +1045,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev) len, DMA_TO_DEVICE); priv->tx_skbuff[entry] = NULL; priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion); + wmb(); priv->hw->desc->set_tx_owner(desc); } @@ -1056,6 +1057,9 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev) if (likely(priv->tm->enable)) priv->hw->desc->clear_tx_ic(desc); #endif + + wmb(); + /* To avoid raise condition */ priv->hw->desc->set_tx_owner(first); @@ -1118,6 +1122,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv) } RX_DBG(KERN_INFO "\trefill entry #%d\n", entry); } + wmb(); priv->hw->desc->set_rx_owner(p + entry); } } -- 2.46.0