From: Gregory CLEMENT <[EMAIL PROTECTED]>
Initially transmit buffer pointers were only reset. But buffer
descriptors were possibly still set as ready, and buffer in upper
layer was not freed. This caused driver hang under big load. Now
reset clean properly the buffer descriptor and freed upper layer.
Signed-off-by: Gregory CLEMENT <[EMAIL PROTECTED]>
Signed-off-by: Haavard Skinnemoen <[EMAIL PROTECTED]>
---
drivers/net/macb.c | 25 ++++++++++++++++++++++++-
1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 047ea7b..e10528e 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -307,8 +307,31 @@ static void macb_tx(struct macb *bp)
(unsigned long)status);
if (status & MACB_BIT(UND)) {
+ int i;
printk(KERN_ERR "%s: TX underrun, resetting buffers\n",
- bp->dev->name);
+ bp->dev->name);
+
+ head = bp->tx_head;
+
+ /*Mark all the buffer as used to avoid sending a lost buffer*/
+ for (i = 0; i < TX_RING_SIZE; i++)
+ bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
+
+ /* free transmit buffer in upper layer*/
+ for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
+ struct ring_info *rp = &bp->tx_skb[tail];
+ struct sk_buff *skb = rp->skb;
+
+ BUG_ON(skb == NULL);
+
+ rmb();
+
+ dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
+ DMA_TO_DEVICE);
+ rp->skb = NULL;
+ dev_kfree_skb_irq(skb);
+ }
+
bp->tx_head = bp->tx_tail = 0;
}
--
1.5.3.4
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