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>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 6f77a46c7e2c..bcd8a3414722 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -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);