b44: tx bounce sizing.

No need to grap full size MTU buffer for possibly small transmit
bounce buffers.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index e87bab9f9bea..d10d31cd12d7 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -69,7 +69,6 @@
 #define NEXT_TX(N)              (((N) + 1) & (B44_TX_RING_SIZE - 1))
 
 #define RX_PKT_BUF_SZ           (1536 + bp->rx_offset + 64)
-#define TX_PKT_BUF_SZ           (B44_MAX_MTU + ETH_HLEN + 8)
 
 /* minimum number of free TX descriptors required to wake up TX process */
 #define B44_TX_WAKEUP_THRESH            (B44_TX_RING_SIZE / 4)
@@ -968,7 +967,6 @@ static void b44_tx_timeout(struct net_device *dev)
 static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
         struct b44 *bp = netdev_priv(dev);
-        struct sk_buff *bounce_skb;
         int rc = NETDEV_TX_OK;
         dma_addr_t mapping;
         u32 len, entry, ctrl;
@@ -986,12 +984,13 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
         mapping = pci_map_single(bp->pdev, skb->data, len, PCI_DMA_TODEVICE);
         if (dma_mapping_error(mapping) || mapping + len > DMA_30BIT_MASK) {
+                struct sk_buff *bounce_skb;
+
                 /* Chip can't handle DMA to/from >1GB, use bounce buffer */
                 if (!dma_mapping_error(mapping))
                         pci_unmap_single(bp->pdev, mapping, len, PCI_DMA_TODEVICE);
 
-                bounce_skb = __dev_alloc_skb(TX_PKT_BUF_SZ,
-                                             GFP_ATOMIC|GFP_DMA);
+                bounce_skb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA);
                 if (!bounce_skb)
                         goto err_out;
 
@@ -1000,13 +999,12 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 if (dma_mapping_error(mapping) || mapping + len > DMA_30BIT_MASK) {
                         if (!dma_mapping_error(mapping))
                                 pci_unmap_single(bp->pdev, mapping,
-                                         len, PCI_DMA_TODEVICE);
+                                                 len, PCI_DMA_TODEVICE);
                         dev_kfree_skb_any(bounce_skb);
                         goto err_out;
                 }
 
-                skb_copy_from_linear_data(skb, skb_put(bounce_skb, len),
-                                          skb->len);
+                skb_copy_from_linear_data(skb, skb_put(bounce_skb, len), len);
                 dev_kfree_skb_any(skb);
                 skb = bounce_skb;
         }