diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 4cbebf3d80eb1492d847f1ad8a9888e2a6c17b97..73b000df8a08c7f3706b097a678fbf32d268f54c 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -385,7 +385,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	 * data.
 	 */
 	bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, bufaddr,
-			FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
+			skb->len, DMA_TO_DEVICE);
 	if (dma_mapping_error(&fep->pdev->dev, bdp->cbd_bufaddr)) {
 		bdp->cbd_bufaddr = 0;
 		fep->tx_skbuff[index] = NULL;
@@ -779,11 +779,10 @@ fec_enet_tx(struct net_device *ndev)
 		else
 			index = bdp - fep->tx_bd_base;
 
-		dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr,
-				FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
-		bdp->cbd_bufaddr = 0;
-
 		skb = fep->tx_skbuff[index];
+		dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr, skb->len,
+				DMA_TO_DEVICE);
+		bdp->cbd_bufaddr = 0;
 
 		/* Check for errors. */
 		if (status & (BD_ENET_TX_HB | BD_ENET_TX_LC |