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| author |   Shiraz Hashim <shiraz.hashim@st.com> | 2011-07-17 20:54:08 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2011-07-18 10:47:24 -0700 |
| commit | eb0dc4bb2e22c04964d6e9545e86f629f117108b (patch) | |
| tree | c0684b04a86f72d204c8e4e6f28b07ea410e2243 | |
| parent | vhost: vhost TX zero-copy support (diff) | |
| download | linux-dev-eb0dc4bb2e22c04964d6e9545e86f629f117108b.tar.xz linux-dev-eb0dc4bb2e22c04964d6e9545e86f629f117108b.zip | |
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 <shiraz.hashim@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/stmmac/stmmac_main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c index d4adc806f6f8..c8c9e5bc6608 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); } } |