mwifiex: replace netif_carrier_on/off by netif_device_attach/dettach

Driver is doing netif_carrier_off during suspend, which will set
the IFF_LOWER_UP flag to 0. As a result certain applications
will think this as a real carrier down and behave accordingly.
This will cause issues like loss of IP address, for example. To
fix this use netif_device_dettach during suspend.

Fixes: 0026b32d ('mwifiex: fix Tx timeout issue during suspend test')
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -3391,11 +3391,8 @@ static int mwifiex_cfg80211_suspend(struct wiphy *wiphy,
 
 	for (i = 0; i < adapter->priv_num; i++) {
 		priv = adapter->priv[i];
-		if (priv && priv->netdev) {
-			mwifiex_stop_net_dev_queue(priv->netdev, adapter);
-			if (netif_carrier_ok(priv->netdev))
-				netif_carrier_off(priv->netdev);
-		}
+		if (priv && priv->netdev)
+			netif_device_detach(priv->netdev);
 	}
 
 	for (i = 0; i < retry_num; i++) {
@@ -3466,11 +3463,8 @@ static int mwifiex_cfg80211_resume(struct wiphy *wiphy)
 
 	for (i = 0; i < adapter->priv_num; i++) {
 		priv = adapter->priv[i];
-		if (priv && priv->netdev) {
-			if (!netif_carrier_ok(priv->netdev))
-				netif_carrier_on(priv->netdev);
-			mwifiex_wake_up_net_dev_queue(priv->netdev, adapter);
-		}
+		if (priv && priv->netdev)
+			netif_device_attach(priv->netdev);
 	}
 
 	if (!wiphy->wowlan_config)