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mv643xx_eth: mp->tx_desc_count needs spinlock protection 

mv643xx_eth_start_xmit() should check mp->tx_desc_count only
inside the mp->lock spinlock.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Reviewed-by: Tzachi Perelstein <tzachi@marvell.com>
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
This commit is contained in:
Lennert Buytenhek 2008-03-18 11:32:41 -07:00 committed by Jeff Garzik
parent dd9e0dda66
commit 4d64e718b4
1 changed files with 11 additions and 12 deletions
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23
drivers/net/mv643xx_eth.c
View File

@ -1741,23 +1741,22 @@ static int mv643xx_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
BUG_ON(netif_queue_stopped(dev));
BUG_ON(skb == NULL);
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);
if (has_tiny_unaligned_frags(skb) && __skb_linearize(skb)) {
stats->tx_dropped++;
printk(KERN_DEBUG "%s: failed to linearize tiny "
"unaligned fragment\n", dev->name);
return 1;
}
if (has_tiny_unaligned_frags(skb)) {
if (__skb_linearize(skb)) {
stats->tx_dropped++;
printk(KERN_DEBUG "%s: failed to linearize tiny "
"unaligned fragment\n", dev->name);
return 1;
}
}
spin_lock_irqsave(&mp->lock, flags);
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);
spin_unlock_irqrestore(&mp->lock, flags);
return 1;
}
eth_tx_submit_descs_for_skb(mp, skb);
stats->tx_bytes += skb->len;
stats->tx_packets++;