tlan: Fix small (< 64 bytes) datagram transmissions

The TLAN chip does not support tranmissions smaller than 64
bytes. Smaller transfers need to be padded up to that size. This was
broken by commit id 41873e9aff0632d80c74380d58a89e8d420151bd ("tlan:
get rid of padding buffer").

<URL:http://bugzilla.kernel.org/show_bug.cgi?id=11754>

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/net/tlan.c b/drivers/net/tlan.c
index c41d68761364..cf8cdafda5af 100644
--- a/drivers/net/tlan.c
+++ b/drivers/net/tlan.c
@@ -1098,6 +1098,7 @@ static int TLan_StartTx( struct sk_buff *skb, struct net_device *dev )
         dma_addr_t      tail_list_phys;
         u8              *tail_buffer;
         unsigned long   flags;
+        unsigned int    txlen;
 
         if ( ! priv->phyOnline ) {
                 TLAN_DBG( TLAN_DEBUG_TX, "TRANSMIT:  %s PHY is not ready\n",
@@ -1108,6 +1109,7 @@ static int TLan_StartTx( struct sk_buff *skb, struct net_device *dev )
 
         if (skb_padto(skb, TLAN_MIN_FRAME_SIZE))
                 return 0;
+        txlen = max(skb->len, (unsigned int)TLAN_MIN_FRAME_SIZE);
 
         tail_list = priv->txList + priv->txTail;
         tail_list_phys = priv->txListDMA + sizeof(TLanList) * priv->txTail;
@@ -1125,16 +1127,16 @@ static int TLan_StartTx( struct sk_buff *skb, struct net_device *dev )
 
         if ( bbuf ) {
                 tail_buffer = priv->txBuffer + ( priv->txTail * TLAN_MAX_FRAME_SIZE );
-                skb_copy_from_linear_data(skb, tail_buffer, skb->len);
+                skb_copy_from_linear_data(skb, tail_buffer, txlen);
         } else {
                 tail_list->buffer[0].address = pci_map_single(priv->pciDev,
-                                                              skb->data, skb->len,
+                                                              skb->data, txlen,
                                                               PCI_DMA_TODEVICE);
                 TLan_StoreSKB(tail_list, skb);
         }
 
-        tail_list->frameSize = (u16) skb->len;
-        tail_list->buffer[0].count = TLAN_LAST_BUFFER | (u32) skb->len;
+        tail_list->frameSize = (u16) txlen;
+        tail_list->buffer[0].count = TLAN_LAST_BUFFER | (u32) txlen;
         tail_list->buffer[1].count = 0;
         tail_list->buffer[1].address = 0;