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authorDale Farnsworth <dale@farnsworth.org>2006-04-11 18:24:26 -0700
committerJeff Garzik <jeff@garzik.org>2006-04-12 18:11:23 -0400
commit94843566d7119e049a72618a3c939d5c2be022c7 (patch)
tree4b0b90677e6ad7cbe70914a3ad33bdf57a55997d /drivers/net
parent5c5374087707d7848cb13f15e7c175daf346301c (diff)
[PATCH] mv643xx_eth: Fix tx_timeout to only conditionally wake tx queue
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>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/mv643xx_eth.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 85ac42c85aa..ea62a3e7d58 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -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)) {