[netdevice] Avoid using zero as a network device index

Avoid using zero as a network device index, so that a zero sin6_scope_id can be used to mean "unspecified" (rather than unintentionally meaning "net0"). Signed-off-by: Michael Brown <mcb30@ipxe.org>
ipxe · Jul 28, 2015 · 9c185e2 · 9c185e2
1 parent 41670ca
commit 9c185e2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/net/netdevice.c b/src/net/netdevice.c
@@ -676,11 +676,11 @@ int register_netdev ( struct net_device *netdev ) {
 	}
 
 	/* Record device index and create device name */
-	netdev->index = netdev_index++;
 	if ( netdev->name[0] == '\0' ) {
 		snprintf ( netdev->name, sizeof ( netdev->name ), "net%d",
-			   netdev->index );
+			   netdev_index );
 	}
+	netdev->index = ++netdev_index;
 
 	/* Use least significant bits of the link-layer address to
 	 * improve the randomness of the (non-cryptographic) random