diff options
author | Rob Herring <rob.herring@calxeda.com> | 2013-03-28 12:32:44 +0100 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-03-29 20:29:35 +0100 |
commit | dc574f1d52d893f516f3786ff7635450bac00eef (patch) | |
tree | a2080c00ac85c6d76a5573e6d5b9385bebb3888c /drivers/net/ethernet/calxeda | |
parent | net: core: Remove redundant call to 'nf_reset' in 'dev_forward_skb' (diff) | |
download | linux-dc574f1d52d893f516f3786ff7635450bac00eef.tar.xz linux-dc574f1d52d893f516f3786ff7635450bac00eef.zip |
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>
Diffstat (limited to 'drivers/net/ethernet/calxeda')
-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)) |