staging: dpaa2-ethsw: fix reported link state

On the .ndo_open() callback set netif_carrier_off() until the link state
interrupt is received so that the LOWER_UP flag does not show up
incorrectly in the output of 'ip link show'.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20200714133431.17532-2-ioana.ciornei@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-dpaa2/ethsw/ethsw.c

@@ -473,6 +473,13 @@ static int port_open(struct net_device *netdev)
 	/* No need to allow Tx as control interface is disabled */
 	netif_tx_stop_all_queues(netdev);
 
+	/* Explicitly set carrier off, otherwise
+	 * netif_carrier_ok() will return true and cause 'ip link show'
+	 * to report the LOWER_UP flag, even though the link
+	 * notification wasn't even received.
+	 */
+	netif_carrier_off(netdev);
+
 	err = dpsw_if_enable(port_priv->ethsw_data->mc_io, 0,
 			     port_priv->ethsw_data->dpsw_handle,
 			     port_priv->idx);