Commit  7d7355f58ba4 ("sh_eth: Ensure proper ordering of descriptor active
bit write/read") did the right thing  but used too "heavy" barriers while
there were already "lighter" DMA barriers exactly  for this case...

Signed-off-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>

---
The patch is against DaveM's 'net-next.git' repo.

Changes in version 2:
- fixed the subject.

 drivers/net/ethernet/renesas/sh_eth.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -1416,7 +1416,7 @@ static int sh_eth_txfree(struct net_devi
                if (txdesc->status & cpu_to_edmac(mdp, TD_TACT))
                        break;
                /* TACT bit must be checked before all the following reads */
-               rmb();
+               dma_rmb();
                netif_info(mdp, tx_done, ndev,
                           "tx entry %d status 0x%08x\n",
                           entry, edmac_to_cpu(mdp, txdesc->status));
@@ -1458,7 +1458,7 @@ static int sh_eth_rx(struct net_device *
        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();
+               dma_rmb();
                desc_status = edmac_to_cpu(mdp, rxdesc->status);
                pkt_len = rxdesc->frame_length;
 
@@ -1544,7 +1544,7 @@ static int sh_eth_rx(struct net_device *
                        skb_checksum_none_assert(skb);
                        rxdesc->addr = dma_addr;
                }
-               wmb(); /* RACT bit must be set after all the above writes */
+               dma_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_RDLE);
@@ -2403,7 +2403,7 @@ static int sh_eth_start_xmit(struct sk_b
        }
        txdesc->buffer_length = skb->len;
 
-       wmb(); /* TACT bit must be set after all the above writes */
+       dma_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
--
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