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

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This was fixed in upstream by commit 7d9e6c5afa ("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 # 4.9.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>
This commit is contained in:
Lars Persson
2019-04-15 09:50:34 +02:00
committed by Chris
parent f3e9716629
commit cbcd4c351b
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@@ -1767,11 +1767,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
if (ret < 0)
pr_warn("%s: failed debugFS registration\n", __func__);
#endif
/* Start the ball rolling... */
pr_debug("%s: DMA RX/TX processes started...\n", dev->name);
priv->hw->dma->start_tx(priv->ioaddr);
priv->hw->dma->start_rx(priv->ioaddr);
/* Dump DMA/MAC registers */
if (netif_msg_hw(priv)) {
priv->hw->mac->dump_regs(priv->hw);
@@ -1799,6 +1794,11 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
if (priv->tso)
priv->hw->dma->enable_tso(priv->ioaddr, 1, STMMAC_CHAN0);
/* Start the ball rolling... */
pr_debug("%s: DMA RX/TX processes started...\n", dev->name);
priv->hw->dma->start_tx(priv->ioaddr);
priv->hw->dma->start_rx(priv->ioaddr);
return 0;
}