e1000e: fix accessing to suspended device

This patch fixes some annoying messages like 'Error reading PHY register' and
'Hardware Erorr' and saves several seconds on reboot.

Cc: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Borislav Petkov <bp@suse.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/e1000e/ethtool.c

@@ -36,6 +36,7 @@
 #include <linux/delay.h>
 #include <linux/vmalloc.h>
 #include <linux/mdio.h>
+#include <linux/pm_runtime.h>
 
 #include "e1000.h"
 
@@ -2229,7 +2230,19 @@ static int e1000e_get_ts_info(struct net_device *netdev,
 	return 0;
 }
 
+static int e1000e_ethtool_begin(struct net_device *netdev)
+{
+	return pm_runtime_get_sync(netdev->dev.parent);
+}
+
+static void e1000e_ethtool_complete(struct net_device *netdev)
+{
+	pm_runtime_put_sync(netdev->dev.parent);
+}
+
 static const struct ethtool_ops e1000_ethtool_ops = {
+	.begin			= e1000e_ethtool_begin,
+	.complete		= e1000e_ethtool_complete,
 	.get_settings		= e1000_get_settings,
 	.set_settings		= e1000_set_settings,
 	.get_drvinfo		= e1000_get_drvinfo,

drivers/net/ethernet/intel/e1000e/netdev.c

@@ -4663,6 +4663,7 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
 	    (adapter->hw.phy.media_type == e1000_media_type_copper)) {
 		int ret_val;
 
+		pm_runtime_get_sync(&adapter->pdev->dev);
 		ret_val = e1e_rphy(hw, MII_BMCR, &phy->bmcr);
 		ret_val |= e1e_rphy(hw, MII_BMSR, &phy->bmsr);
 		ret_val |= e1e_rphy(hw, MII_ADVERTISE, &phy->advertise);
@@ -4673,6 +4674,7 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
 		ret_val |= e1e_rphy(hw, MII_ESTATUS, &phy->estatus);
 		if (ret_val)
 			e_warn("Error reading PHY register\n");
+		pm_runtime_put_sync(&adapter->pdev->dev);
 	} else {
 		/* Do not read PHY registers if link is not up
 		 * Set values to typical power-on defaults