From bdcba1511b98f2e728b3a910b8771a0d3fce5bf3 Mon Sep 17 00:00:00 2001 From: Gregory CLEMENT Date: Wed, 19 Dec 2007 18:23:44 +0100 Subject: [PATCH] MACB: clear transmit buffers properly on transmit underrun 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 Signed-off-by: Haavard Skinnemoen Signed-off-by: Jeff Garzik --- drivers/net/macb.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) 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; } -- 2.7.4