[PATCH] 3c501 - fix end of small packet clearing

drivers/net/3c501.c

@@ -36,6 +36,10 @@
 
     Check up pass for 2.5. Nothing significant changed
     		20021009 Alan Cox <alan@redhat.com>
+
+    Fixed zero fill corner case 
+    		20030104 Alan Cox <alan@redhat.com>
+    		
     		
    For the avoidance of doubt the "preferred form" of this code is one which
    is in an open non patent encumbered format. Where cryptographic key signing
@@ -421,8 +425,15 @@ static int el_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	do
 	{
-		int gp_start = 0x800 - (ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN);
+		int len = skb->len;
+		int pad = 0;
+		int gp_start;
 		unsigned char *buf = skb->data;
+		
+		if (len < ETH_ZLEN)
+			pad = ETH_ZLEN - len;
+			
+		gp_start = 0x800 - ( len + pad );
 
 		lp->tx_pkt_start = gp_start;
     		lp->collisions = 0;
@@ -450,7 +461,11 @@ static int el_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		
 		outw(0x00, RX_BUF_CLR);		/* Set rx packet area to 0. */
 		outw(gp_start, GP_LOW);		/* aim - packet will be loaded into buffer start */
-		outsb(DATAPORT,buf,skb->len);	/* load buffer (usual thing each byte increments the pointer) */
+		outsb(DATAPORT,buf,len);	/* load buffer (usual thing each byte increments the pointer) */
+		if (pad) {
+			while(pad--)		/* Zero fill buffer tail */
+				outb(0, DATAPORT);
+		}
 		outw(gp_start, GP_LOW);		/* the board reuses the same register */
 	
 		if(lp->loading != 2)