sh_eth: Fix RX recovery on R-Car in case of RX ring underrun

[pandora-kernel.git] / drivers / net / ethernet / renesas / sh_eth.c

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 4da8bd2..3309494 100644 (file)
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1392,6 +1392,9 @@ static void sh_eth_dev_exit(struct net_device *ndev)
        msleep(2); /* max frame time at 10 Mbps < 1250 us */
        sh_eth_get_stats(ndev);
        sh_eth_reset(ndev);
+
+       /* Set MAC address again */
+       update_mac_address(ndev);
 }
 
 /* free Tx skb function */
@@ -1407,6 +1410,8 @@ static int sh_eth_txfree(struct net_device *ndev)
                txdesc = &mdp->tx_ring[entry];
                if (txdesc->status & cpu_to_edmac(mdp, TD_TACT))
                        break;
+               /* TACT bit must be checked before all the following reads */
+               rmb();
                /* Free the original skb. */
                if (mdp->tx_skbuff[entry]) {
                        dma_unmap_single(&ndev->dev, txdesc->addr,
@@ -1444,6 +1449,8 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
        limit = boguscnt;
        rxdesc = &mdp->rx_ring[entry];
        while (!(rxdesc->status & cpu_to_edmac(mdp, RD_RACT))) {
+               /* RACT bit must be checked before all the following reads */
+               rmb();
                desc_status = edmac_to_cpu(mdp, rxdesc->status);
                pkt_len = rxdesc->frame_length;
 
@@ -1523,6 +1530,7 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
                        skb_checksum_none_assert(skb);
                        rxdesc->addr = dma_addr;
                }
+               wmb(); /* RACT bit must be set after all the above writes */
                if (entry >= mdp->num_rx_ring - 1)
                        rxdesc->status |=
                                cpu_to_edmac(mdp, RD_RACT | RD_RFP | RD_RDEL);
@@ -1535,7 +1543,7 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
        /* If we don't need to check status, don't. -KDU */
        if (!(sh_eth_read(ndev, EDRRR) & EDRRR_R)) {
                /* fix the values for the next receiving if RDE is set */
-               if (intr_status & EESR_RDE) {
+               if (intr_status & EESR_RDE && mdp->reg_offset[RDFAR] != 0) {
                        u32 count = (sh_eth_read(ndev, RDFAR) -
                                     sh_eth_read(ndev, RDLAR)) >> 4;
 
@@ -2192,6 +2200,7 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
        }
        txdesc->buffer_length = skb->len;
 
+       wmb(); /* TACT bit must be set after all the above writes */
        if (entry >= mdp->num_tx_ring - 1)
                txdesc->status |= cpu_to_edmac(mdp, TD_TACT | TD_TDLE);
        else