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authorSergei Shtylyov <sergei.shtylyov@cogentembedded.com>2015-11-03 22:36:04 +0300
committerDavid S. Miller <davem@davemloft.net>2015-11-03 23:02:26 +0300
commitf32bfb9a8ca083f8d148ea90ae5ba66f4831836e (patch)
treed4f0001a4a03f2357284e5ff026461cfdb7ffd8f
parent73186df8d7fa574345f0ad626ebe89649f8308a5 (diff)
downloadlinux-f32bfb9a8ca083f8d148ea90ae5ba66f4831836e.tar.xz
sh_eth: use DMA barriers
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.shtylyov@cogentembedded.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/renesas/sh_eth.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index dc5d34e1d01e..6150a235b72c 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1416,7 +1416,7 @@ static int sh_eth_txfree(struct net_device *ndev)
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 *ndev, u32 intr_status, int *quota)
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 *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 */
+ 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_buff *skb, struct net_device *ndev)
}
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