Am 19.02.2016 um 07:59 schrieb Shuyu Wei <sy.w at outlook.com>:
> Doing tx_clean() inside poll() may scramble the tx ring buffer if
> tx() is running. This will cause tx to stop working, which can be
> reproduced by simultaneously downloading two large files at high speed.
>
> Moving tx_clean() into tx() will prevent this. And tx interrupt is no
> longer needed now.
>
> Signed-off-by: Shuyu Wei <sy.w at outlook.com>
Tested-by: Michael Niewoehner <linux at mniewoehner.de>
> ---
>
> diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
> index abe1eab..34531b3 100644
> --- a/drivers/net/ethernet/arc/emac_main.c
> +++ b/drivers/net/ethernet/arc/emac_main.c
> @@ -311,12 +311,10 @@ static int arc_emac_poll(struct napi_struct *napi, int budget)
> struct arc_emac_priv *priv = netdev_priv(ndev);
> unsigned int work_done;
>
> - arc_emac_tx_clean(ndev);
> -
> work_done = arc_emac_rx(ndev, budget);
> if (work_done < budget) {
> napi_complete(napi);
> - arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
> + arc_reg_or(priv, R_ENABLE, RXINT_MASK);
> }
>
> return work_done;
> @@ -345,9 +343,9 @@ static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
> /* Reset all flags except "MDIO complete" */
> arc_reg_set(priv, R_STATUS, status);
>
> - if (status & (RXINT_MASK | TXINT_MASK)) {
> + if (status & RXINT_MASK) {
> if (likely(napi_schedule_prep(&priv->napi))) {
> - arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
> + arc_reg_clr(priv, R_ENABLE, RXINT_MASK);
> __napi_schedule(&priv->napi);
> }
> }
> @@ -458,7 +456,7 @@ static int arc_emac_open(struct net_device *ndev)
> arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
>
> /* Enable interrupts */
> - arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
> + arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
>
> /* Set CONTROL */
> arc_reg_set(priv, R_CTRL,
> @@ -529,7 +527,7 @@ static int arc_emac_stop(struct net_device *ndev)
> netif_stop_queue(ndev);
>
> /* Disable interrupts */
> - arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
> + arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
>
> /* Disable EMAC */
> arc_reg_clr(priv, R_CTRL, EN_MASK);
> @@ -587,6 +585,8 @@ static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
> __le32 *info = &priv->txbd[*txbd_curr].info;
> dma_addr_t addr;
>
> + arc_emac_tx_clean(ndev);
> +
> if (skb_padto(skb, ETH_ZLEN))
> return NETDEV_TX_OK;
>
>
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