diff options
| author | Rob Herring | 2013-03-28 11:32:44 +0000 |
|---|---|---|
| committer | David S. Miller | 2013-03-29 15:29:35 -0400 |
| commit | dc574f1d52d893f516f3786ff7635450bac00eef (patch) | |
| tree | a2080c00ac85c6d76a5573e6d5b9385bebb3888c | |
| parent | a561cf7edf9863198bfccecfc5cfe26d951ebd20 (diff) | |
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>
| -rw-r--r-- | drivers/net/ethernet/calxeda/xgmac.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c index a170065b5973..bb1e80bfa78a 100644 --- a/drivers/net/ethernet/calxeda/xgmac.c +++ b/drivers/net/ethernet/calxeda/xgmac.c @@ -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)) |