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stmmac: fix stmmac_tx_avail should be called with TX locked 

stmmac_tx_avail() may lie if used unprotected. It's using cur_tx
and dirty_tx index. These index may be already in use by tx_clean
when entering xmit routine. So, this should be called locked.

This can cause transmit queue to be stuck, with following message:
NETDEV WATCHDOG: eth0 (stmmaceth): transmit queue 0 timed out

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Fabrice Gasnier 2014-11-04 17:08:05 +01:00 committed by David S. Miller
parent b994ca6b67
commit 16ee817e43
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -1894,7 +1894,10 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
unsigned int nopaged_len = skb_headlen(skb);
unsigned int enh_desc = priv->plat->enh_desc;
spin_lock(&priv->tx_lock);
if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
spin_unlock(&priv->tx_lock);
if (!netif_queue_stopped(dev)) {
netif_stop_queue(dev);
/* This is a hard error, log it. */
@ -1903,8 +1906,6 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_BUSY;
}
spin_lock(&priv->tx_lock);
if (priv->tx_path_in_lpi_mode)
stmmac_disable_eee_mode(priv);