net: stmmac: Set dma ring length before enabling the DMA

This was fixed in upstream by commit 7d9e6c5afab6 ("net: stmmac: Integrate
XGMAC into main driver flow") that is a new feature commit.

We found a race condition in the DMA init sequence that hits if the
PHY already has link up during stmmac_hw_setup. Since the ring length
was programmed after enabling the RX path, we might receive a packet
before the correct ring length is programmed. When that happened we
could not get reliable interrupts for DMA RX and the MTL complained
about RX FIFO overrun.

Signed-off-by: Lars Persson <larper@axis.com>
Cc: stable@vger.kernel.org # 4.14.x
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4a9dbee6f0546e884a9b50c5af67656f42a29ea3..f2429ec07b5782ab03707d41d6505a4fe991b56c 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2536,9 +2536,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
                netdev_warn(priv->dev, "%s: failed debugFS registration\n",
                            __func__);
 #endif
-       /* Start the ball rolling... */
-       stmmac_start_all_dma(priv);
-
        priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
 
        if ((priv->use_riwt) && (priv->hw->dma->rx_watchdog)) {
@@ -2558,6 +2555,9 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
                        priv->hw->dma->enable_tso(priv->ioaddr, 1, chan);
        }
 
+       /* Start the ball rolling... */
+       stmmac_start_all_dma(priv);
+
        return 0;
 }