[047/107] pxa168_eth: fix race in transmit path.

[Greg KH]

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Richard Cochran <richardcochran@xxxxxxxxx>

commit 384420409d9b5d4443940abace49363d26135412 upstream.

Because the socket buffer is freed in the completion interrupt, it is not
safe to access it after submitting it to the hardware.

Cc: Sachin Sanap <ssanap@xxxxxxxxxxx>
Cc: Zhangfei Gao <zgao6@xxxxxxxxxxx>
Cc: Philip Rakity <prakity@xxxxxxxxxxx>
Signed-off-by: Richard Cochran <richard.cochran@xxxxxxxxxx>
Acked-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/pxa168_eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/pxa168_eth.c
+++ b/drivers/net/pxa168_eth.c
@@ -1273,7 +1273,7 @@ static int pxa168_eth_start_xmit(struct
 	wmb();
 	wrl(pep, SDMA_CMD, SDMA_CMD_TXDH | SDMA_CMD_ERD);
 
-	stats->tx_bytes += skb->len;
+	stats->tx_bytes += length;
 	stats->tx_packets++;
 	dev->trans_start = jiffies;
 	if (pep->tx_ring_size - pep->tx_desc_count <= 1) {


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