X-Git-Url: http://bbs.cooldavid.org/git/?p=jme.git;a=blobdiff_plain;f=jme.c;fp=jme.c;h=9da34cb4fb6304d0423a48e24b9dc4060684605d;hp=4e4613a3dc2ffd80c765ee3d13d56dcc78cda5fd;hb=1eef180c6c36524255aee362949a54232548f979;hpb=577bdf881d4d5a747a08f4ce0fb971ff3f14b77f

diff --git a/jme.c b/jme.c
index 4e4613a..9da34cb 100644
--- a/jme.c
+++ b/jme.c
@@ -769,6 +769,7 @@ jme_make_new_rx_buf(struct jme_adapter *jme, int i)
 	struct jme_ring *rxring = &(jme->rxring[0]);
 	struct jme_buffer_info *rxbi = rxring->bufinf + i;
 	struct sk_buff *skb;
+	dma_addr_t mapping;
 
 	skb = netdev_alloc_skb(jme->dev,
 		jme->dev->mtu + RX_EXTRA_LEN);
@@ -778,14 +779,21 @@ jme_make_new_rx_buf(struct jme_adapter *jme, int i)
 	skb->dev = jme->dev;
 #endif
 
+	mapping = pci_map_page(jme->pdev, virt_to_page(skb->data),
+			       offset_in_page(skb->data), skb_tailroom(skb),
+			       PCI_DMA_FROMDEVICE);
+	if (unlikely(pci_dma_mapping_error(jme->pdev, mapping))) {
+		dev_kfree_skb(skb);
+		return -ENOMEM;
+	}
+
+	if (likely(rxbi->mapping))
+		pci_unmap_page(jme->pdev, rxbi->mapping,
+			       rxbi->len, PCI_DMA_FROMDEVICE);
+
 	rxbi->skb = skb;
 	rxbi->len = skb_tailroom(skb);
-	rxbi->mapping = pci_map_page(jme->pdev,
-					virt_to_page(skb->data),
-					offset_in_page(skb->data),
-					rxbi->len,
-					PCI_DMA_FROMDEVICE);
-
+	rxbi->mapping = mapping;
 	return 0;
 }