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bnx2: Fix bug in bnx2_free_tx_skbs(). 

In rare cases, bnx2x_free_tx_skbs() can unmap the wrong DMA address
when it gets to the last entry of the tx ring.  We were not using
the proper macro to skip the last entry when advancing the tx index.

Reported-by: Zongyun Lai <zlai@vmware.com>
Reviewed-by: Jeffrey Huang <huangjw@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2012-07-10 10:04:40 +00:00 committed by David S. Miller
parent b28ba72665
commit c1f5163de4
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/broadcom/bnx2.c
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@ -5372,7 +5372,7 @@ bnx2_free_tx_skbs(struct bnx2 *bp)
int k, last;
if (skb == NULL) {
j++;
j = NEXT_TX_BD(j);
continue;
}
@ -5384,8 +5384,8 @@ bnx2_free_tx_skbs(struct bnx2 *bp)
tx_buf->skb = NULL;
last = tx_buf->nr_frags;
j++;
for (k = 0; k < last; k++, j++) {
j = NEXT_TX_BD(j);
for (k = 0; k < last; k++, j = NEXT_TX_BD(j)) {
tx_buf = &txr->tx_buf_ring[TX_RING_IDX(j)];
dma_unmap_page(&bp->pdev->dev,
dma_unmap_addr(tx_buf, mapping),