[dhcp] Await link-up before starting DHCP

Modified-by: Michael Brown <mcb30@etherboot.org>
Signed-off-by: Michael Brown <mcb30@etherboot.org>

src/usr/autoboot.c

@@ -39,9 +39,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
  *
  */
 
-/** Time to wait for link-up */
-#define LINK_WAIT_MS 15000
-
 /** Shutdown flags for exit */
 int shutdown_exit_flags = 0;
 
@@ -153,10 +150,6 @@ static int netboot ( struct net_device *netdev ) {
 		return rc;
 	ifstat ( netdev );
 
-	/* Wait for link-up */
-	if ( ( rc = iflinkwait ( netdev, LINK_WAIT_MS ) ) != 0 )
-		return rc;
-
 	/* Configure device via DHCP */
 	if ( ( rc = dhcp ( netdev ) ) != 0 )
 		return rc;

src/usr/dhcpmgmt.c

@@ -28,6 +28,8 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <usr/ifmgmt.h>
 #include <usr/dhcpmgmt.h>
 
+#define LINK_WAIT_MS	15000
+
 /** @file
  *
  * DHCP management
@@ -41,6 +43,10 @@ int dhcp ( struct net_device *netdev ) {
 	if ( ( rc = ifopen ( netdev ) ) != 0 )
 		return rc;
 
+	/* Wait for link-up */
+	if ( ( rc = iflinkwait ( netdev, LINK_WAIT_MS ) ) != 0 )
+		return rc;
+
 	/* Perform DHCP */
 	printf ( "DHCP (%s %s)", netdev->name, netdev_hwaddr ( netdev ) );
 	if ( ( rc = start_dhcp ( &monojob, netdev ) ) == 0 )