From 16ee817e4365cdfe665ae8d6f6bc8f09befa1272 Mon Sep 17 00:00:00 2001
From: Fabrice Gasnier <fabrice.gasnier@st.com>
Date: Tue, 4 Nov 2014 17:08:05 +0100
Subject: [PATCH] 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>
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