diff options
| author | Lars Persson <lars.persson@axis.com> | 2019-04-15 09:49:47 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-20 09:15:10 +0200 |
| commit | 5661213956662f592979925eab1e4dfff955ba05 (patch) | |
| tree | 04900e1a374e8d2041431004cf8170de0f161bd0 /drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | |
| parent | 03f11a51a196a9aadc20a70a73825a811a726218 (diff) | |
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>
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/stmmac_main.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 4a9dbee6f054..f2429ec07b57 100644 --- 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; } |