Revert "tg3: Remove residual error handling in tg3_suspend"

This reverts commit 9ab4ad29.

I went out of coffee and applied it to the wrong tree. Blame on me.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/broadcom/tg3.c

@@ -4019,7 +4019,7 @@ static int tg3_power_up(struct tg3 *tp)
 
 static int tg3_setup_phy(struct tg3 *, bool);
 
-static void tg3_power_down_prepare(struct tg3 *tp)
+static int tg3_power_down_prepare(struct tg3 *tp)
 {
 	u32 misc_host_ctrl;
 	bool device_should_wake, do_low_power;
@@ -4263,7 +4263,7 @@ static void tg3_power_down_prepare(struct tg3 *tp)
 
 	tg3_ape_driver_state_change(tp, RESET_KIND_SHUTDOWN);
 
-	return;
+	return 0;
 }
 
 static void tg3_power_down(struct tg3 *tp)
@@ -18084,6 +18084,7 @@ static int tg3_suspend(struct device *device)
 {
 	struct net_device *dev = dev_get_drvdata(device);
 	struct tg3 *tp = netdev_priv(dev);
+	int err = 0;
 
 	rtnl_lock();
 
@@ -18107,11 +18108,32 @@ static int tg3_suspend(struct device *device)
 	tg3_flag_clear(tp, INIT_COMPLETE);
 	tg3_full_unlock(tp);
 
-	tg3_power_down_prepare(tp);
+	err = tg3_power_down_prepare(tp);
+	if (err) {
+		int err2;
+
+		tg3_full_lock(tp, 0);
+
+		tg3_flag_set(tp, INIT_COMPLETE);
+		err2 = tg3_restart_hw(tp, true);
+		if (err2)
+			goto out;
+
+		tg3_timer_start(tp);
+
+		netif_device_attach(dev);
+		tg3_netif_start(tp);
+
+out:
+		tg3_full_unlock(tp);
+
+		if (!err2)
+			tg3_phy_start(tp);
+	}
 
 unlock:
 	rtnl_unlock();
-	return 0;
+	return err;
 }
 
 static int tg3_resume(struct device *device)