diff options
| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-24 07:42:31 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-24 07:42:31 -0800 |
| commit | 6e35c24b9f5b2f68732910d2138bc0eb1b477ab1 (patch) | |
| tree | 350c60fc080ec1f6dee8c1eb4c37aee7ee0cfce9 | |
| parent | d0f29485686d9d1c4f31240953a742d5dd4fdb72 (diff) | |
| parent | e47b207a5bcb73bb097f94d9fe364f50737b0eb2 (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.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c index c41ae4286eea..b3bf86422734 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 |