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benet: fix the misusage of zero dma address

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benet driver wrongly assumes that zero is an invalid dma address
(calls dma_unmap_page for only non zero dma addresses). Zero is a
valid dma address on some architectures. The dma length can be used
here.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
FUJITA Tomonori 2010-04-04 21:40:18 +00:00 committed by David S. Miller
parent fac6da5b7a
commit b681ee77f8
1 changed files with 1 additions and 1 deletions
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2
drivers/net/benet/be_main.c
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@ -404,7 +404,7 @@ static void unmap_tx_frag(struct pci_dev *pdev, struct be_eth_wrb *wrb,
be_dws_le_to_cpu(wrb, sizeof(*wrb));
dma = (u64)wrb->frag_pa_hi << 32 | (u64)wrb->frag_pa_lo;
if (dma != 0) {
if (wrb->frag_len) {
if (unmap_single)
pci_unmap_single(pdev, dma, wrb->frag_len,
PCI_DMA_TODEVICE);