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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-24 07:42:31 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-24 07:42:31 -0800
commit6e35c24b9f5b2f68732910d2138bc0eb1b477ab1 (patch)
tree350c60fc080ec1f6dee8c1eb4c37aee7ee0cfce9
parentd0f29485686d9d1c4f31240953a742d5dd4fdb72 (diff)
parente47b207a5bcb73bb097f94d9fe364f50737b0eb2 (diff)
Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6
* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6: mv643xx_eth: Fix race condition in mv643xx_eth_free_tx_descs s2io bogus memset
-rw-r--r--drivers/net/mv643xx_eth.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index c41ae4286ee..b3bf8642273 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -314,6 +314,13 @@ int mv643xx_eth_free_tx_descs(struct net_device *dev, int force)
while (mp->tx_desc_count > 0) {
spin_lock_irqsave(&mp->lock, flags);
+
+ /* tx_desc_count might have changed before acquiring the lock */
+ if (mp->tx_desc_count <= 0) {
+ spin_unlock_irqrestore(&mp->lock, flags);
+ return released;
+ }
+
tx_index = mp->tx_used_desc_q;
desc = &mp->p_tx_desc_area[tx_index];
cmd_sts = desc->cmd_sts;
@@ -332,13 +339,13 @@ int mv643xx_eth_free_tx_descs(struct net_device *dev, int force)
if (skb)
mp->tx_skb[tx_index] = NULL;
- spin_unlock_irqrestore(&mp->lock, flags);
-
if (cmd_sts & ETH_ERROR_SUMMARY) {
printk("%s: Error in TX\n", dev->name);
mp->stats.tx_errors++;
}
+ spin_unlock_irqrestore(&mp->lock, flags);
+
if (cmd_sts & ETH_TX_FIRST_DESC)
dma_unmap_single(NULL, addr, count, DMA_TO_DEVICE);
else