acenic: fix the misusage of zero dma address

acenic 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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/acenic.c b/drivers/net/acenic.c
index 4ae750e..e52cc3b 100644 (file)
--- a/drivers/net/acenic.c
+++ b/drivers/net/acenic.c
@@ -2077,18 +2077,16 @@ static inline void ace_tx_int(struct net_device *dev,
 
        do {
                struct sk_buff *skb;
-               dma_addr_t mapping;
                struct tx_ring_info *info;
 
                info = ap->skb->tx_skbuff + idx;
                skb = info->skb;
-               mapping = pci_unmap_addr(info, mapping);
 
-               if (mapping) {
-                       pci_unmap_page(ap->pdev, mapping,
+               if (dma_unmap_len(info, maplen)) {
+                       pci_unmap_page(ap->pdev, dma_unmap_addr(info, mapping),
                                       pci_unmap_len(info, maplen),
                                       PCI_DMA_TODEVICE);
-                       pci_unmap_addr_set(info, mapping, 0);
+                       dma_unmap_len_set(info, maplen, 0);
                }
 
                if (skb) {
@@ -2376,14 +2374,12 @@ static int ace_close(struct net_device *dev)
 
        for (i = 0; i < ACE_TX_RING_ENTRIES(ap); i++) {
                struct sk_buff *skb;
-               dma_addr_t mapping;
                struct tx_ring_info *info;
 
                info = ap->skb->tx_skbuff + i;
                skb = info->skb;
-               mapping = pci_unmap_addr(info, mapping);
 
-               if (mapping) {
+               if (dma_unmap_len(info, maplen)) {
                        if (ACE_IS_TIGON_I(ap)) {
                                /* NB: TIGON_1 is special, tx_ring is in io space */
                                struct tx_desc __iomem *tx;
@@ -2394,10 +2390,10 @@ static int ace_close(struct net_device *dev)
                        } else
                                memset(ap->tx_ring + i, 0,
                                       sizeof(struct tx_desc));
-                       pci_unmap_page(ap->pdev, mapping,
+                       pci_unmap_page(ap->pdev, dma_unmap_addr(info, mapping),
                                       pci_unmap_len(info, maplen),
                                       PCI_DMA_TODEVICE);
-                       pci_unmap_addr_set(info, mapping, 0);
+                       dma_unmap_len_set(info, maplen, 0);
                }
                if (skb) {
                        dev_kfree_skb(skb);