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[PATCH] mv643xx_eth: Fix tx_timeout to only conditionally wake tx queue

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After resetting the hardware on a tx_timeout, call netif_wake_queue()
only if we have free tx descriptors.

Also, attempt to recover if mv643xx_eth_start_xmit() is called when
there are fewer free tx descriptors than expected.

The BUG_ON() call we are replacing was hit on a tx_timeout that
called netif_wake_queue(), indirectly via netif_device_attach(),
even though we did not have enough free tx descriptors.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Dale Farnsworth 2006-04-11 18:24:26 -07:00 committed by Jeff Garzik
parent 5c53740877
commit 94843566d7
1 changed files with 14 additions and 3 deletions
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17
drivers/net/mv643xx_eth.c
View file

@ -281,10 +281,16 @@ static void mv643xx_eth_tx_timeout_task(struct net_device *dev)
{
struct mv643xx_private *mp = netdev_priv(dev);
netif_device_detach(dev);
if (!netif_running(dev))
return;
netif_stop_queue(dev);
eth_port_reset(mp->port_num);
eth_port_start(dev);
netif_device_attach(dev);
if (mp->tx_ring_size - mp->tx_desc_count >= MAX_DESCS_PER_SKB)
netif_wake_queue(dev);
}
/**
@ -1186,7 +1192,12 @@ static int mv643xx_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
BUG_ON(netif_queue_stopped(dev));
BUG_ON(skb == NULL);
BUG_ON(mp->tx_ring_size - mp->tx_desc_count < MAX_DESCS_PER_SKB);
if (mp->tx_ring_size - mp->tx_desc_count < MAX_DESCS_PER_SKB) {
printk(KERN_ERR "%s: transmit with queue full\n", dev->name);
netif_stop_queue(dev);
return 1;
}
if (has_tiny_unaligned_frags(skb)) {
if ((skb_linearize(skb, GFP_ATOMIC) != 0)) {