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net: calxedaxgmac: fix rx ring handling when OOM 

If skb allocation for the rx ring fails repeatedly, we can reach a point
were the ring is empty. In this condition, the driver is out of sync with
the h/w. While this has always been possible, the removal of the skb
recycling seems to have made triggering this problem easier.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rob Herring 2013-03-28 11:32:44 +00:00 committed by David S. Miller
parent a561cf7edf
commit dc574f1d52
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/calxeda/xgmac.c
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@ -1141,6 +1141,9 @@ static int xgmac_rx(struct xgmac_priv *priv, int limit)
struct sk_buff *skb;
int frame_len;
if (!dma_ring_cnt(priv->rx_head, priv->rx_tail, DMA_RX_RING_SZ))
break;
entry = priv->rx_tail;
p = priv->dma_rx + entry;
if (desc_get_owner(p))