EMAC reset internal tx ring pointer to zero at statup. txbd_curr and txbd_dirty can be different from zero. That cause ethernet transfer hang (no packets transmitted).
In order to reproduce, run on device: ifconfig eth0 down ifconfig eth0 up Signed-off-by: Alexander Kochetkov <al.koc...@gmail.com> --- CC: sta...@vger.kernel.org # 3.18.x- --- drivers/net/ethernet/arc/emac_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c index 63a63e3..4f6e5be 100644 --- a/drivers/net/ethernet/arc/emac_main.c +++ b/drivers/net/ethernet/arc/emac_main.c @@ -447,6 +447,9 @@ static int arc_emac_open(struct net_device *ndev) *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; } + priv->txbd_curr = 0; + priv->txbd_dirty = 0; + /* Clean Tx BD's */ memset(priv->txbd, 0, TX_RING_SZ); -- 1.7.9.5