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

drivers/net/3c501.c

@@ -37,6 +37,10 @@
     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
    forms part of the process of creating an executable the information
@@ -421,9 +425,16 @@ 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)