stmmac: protect tx process with lock (V4)
This patch fixes a problem raised on Orly ARM SMP platform
where, in case of fragmented frames, the descriptors
in the TX ring resulted broken. This was due to a missing lock
protection in the tx process.
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index ae5debb..f80190d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -588,6 +588,8 @@
{
unsigned int txsize = priv->dma_tx_size;
+ spin_lock(&priv->tx_lock);
+
while (priv->dirty_tx != priv->cur_tx) {
int last;
unsigned int entry = priv->dirty_tx % txsize;
@@ -651,6 +653,7 @@
}
netif_tx_unlock(priv->dev);
}
+ spin_unlock(&priv->tx_lock);
}
static inline void stmmac_enable_irq(struct stmmac_priv *priv)
@@ -1078,6 +1081,8 @@
return NETDEV_TX_BUSY;
}
+ spin_lock(&priv->tx_lock);
+
entry = priv->cur_tx % txsize;
#ifdef STMMAC_XMIT_DEBUG
@@ -1166,6 +1171,8 @@
priv->hw->dma->enable_dma_transmission(priv->ioaddr);
+ spin_unlock(&priv->tx_lock);
+
return NETDEV_TX_OK;
}
@@ -1731,6 +1738,7 @@
"please, use ifconfig or nwhwconfig!\n");
spin_lock_init(&priv->lock);
+ spin_lock_init(&priv->tx_lock);
ret = register_netdev(dev);
if (ret) {