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net: sh_eth: fix the rxdesc pointer when rx descriptor empty happens

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When Receive Descriptor Empty happens, rxdesc pointer of the driver
and actual next descriptor of the controller may be mismatch.
This patch fixes it.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yoshihiro Shimoda 2012-05-28 23:07:55 +00:00 committed by David S. Miller
parent 9dae31009b
commit 79fba9f517
1 changed files with 5 additions and 3 deletions
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8
drivers/net/ethernet/renesas/sh_eth.c
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@ -1101,8 +1101,12 @@ static int sh_eth_rx(struct net_device *ndev)
/* Restart Rx engine if stopped. */
/* If we don't need to check status, don't. -KDU */
if (!(sh_eth_read(ndev, EDRRR) & EDRRR_R))
if (!(sh_eth_read(ndev, EDRRR) & EDRRR_R)) {
/* fix the values for the next receiving */
mdp->cur_rx = mdp->dirty_rx = (sh_eth_read(ndev, RDFAR) -
sh_eth_read(ndev, RDLAR)) >> 4;
sh_eth_write(ndev, EDRRR_R, EDRRR);
}
return 0;
}
@ -1199,8 +1203,6 @@ static void sh_eth_error(struct net_device *ndev, int intr_status)
/* Receive Descriptor Empty int */
ndev->stats.rx_over_errors++;
if (sh_eth_read(ndev, EDRRR) ^ EDRRR_R)
sh_eth_write(ndev, EDRRR_R, EDRRR);
if (netif_msg_rx_err(mdp))
dev_err(&ndev->dev, "Receive Descriptor Empty\n");
}