[PATCH v2 net-next] r8169: fix failing WoL

Th referenced change added an extra hw reset to rtl8169_net_suspend()
what makes WoL fail on few chip versions. Therefore skip the extra
reset if we're going down and WoL is enabled.
In rtl_shutdown() rtl8169_hw_reset() is called by rtl8169_net_suspend()
already if needed, therefore avoid issues issue by removing the extra
call. The fix was tested on a system with RTL8168g.

Meanwhile rtl8169_hw_reset() does more than a hw reset and should be
renamed. But that's net-next material.

Fixes: 8ac8e8c64b53 ("r8169: make rtl8169_down central chip quiesce function")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
Uups, first version was cc'ed to Majordomo instead of the netdev mailing list.
---
 drivers/net/ethernet/realtek/r8169_main.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 4d2ec9742..dad84ecf5 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c

@@ -3928,7 +3928,7 @@ static void rtl8169_tx_clear(struct rtl8169_private *tp)
 	netdev_reset_queue(tp->dev);
 }
 
-static void rtl8169_hw_reset(struct rtl8169_private *tp)
+static void rtl8169_hw_reset(struct rtl8169_private *tp, bool going_down)
 {
 	/* Give a racing hard_start_xmit a few cycles to complete. */
 	synchronize_rcu();

@@ -3938,6 +3938,9 @@ static void rtl8169_hw_reset(struct rtl8169_private *tp)
 
 	rtl_rx_close(tp);
 
+	if (going_down && tp->dev->wol_enabled)
+		goto no_reset;
+
 	switch (tp->mac_version) {
 	case RTL_GIGA_MAC_VER_27:
 	case RTL_GIGA_MAC_VER_28:

@@ -3959,7 +3962,7 @@ static void rtl8169_hw_reset(struct rtl8169_private *tp)
 	}
 
 	rtl_hw_reset(tp);
-
+no_reset:
 	rtl8169_tx_clear(tp);
 	rtl8169_init_ring_indexes(tp);
 }

@@ -3972,7 +3975,7 @@ static void rtl_reset_work(struct rtl8169_private *tp)
 	napi_disable(&tp->napi);
 	netif_stop_queue(dev);
 
-	rtl8169_hw_reset(tp);
+	rtl8169_hw_reset(tp, false);
 
 	for (i = 0; i < NUM_RX_DESC; i++)
 		rtl8169_mark_to_asic(tp->RxDescArray + i);

@@ -4637,7 +4640,7 @@ static void rtl8169_down(struct rtl8169_private *tp)
 	phy_stop(tp->phydev);
 	napi_disable(&tp->napi);
 
-	rtl8169_hw_reset(tp);
+	rtl8169_hw_reset(tp, true);
 
 	rtl_pll_power_down(tp);
 

@@ -4942,8 +4945,6 @@ static void rtl_shutdown(struct pci_dev *pdev)
 	/* Restore original MAC address */
 	rtl_rar_set(tp, tp->dev->perm_addr);
 
-	rtl8169_hw_reset(tp);
-
 	if (system_state == SYSTEM_POWER_OFF) {
 		if (tp->saved_wolopts) {
 			rtl_wol_suspend_quirk(tp);

-- 
2.27.0

From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 3 Jun 2020 22:29:06 +0200

Th referenced change added an extra hw reset to rtl8169_net_suspend()
what makes WoL fail on few chip versions. Therefore skip the extra
reset if we're going down and WoL is enabled.
In rtl_shutdown() rtl8169_hw_reset() is called by rtl8169_net_suspend()
already if needed, therefore avoid issues issue by removing the extra
call. The fix was tested on a system with RTL8168g.

Meanwhile rtl8169_hw_reset() does more than a hw reset and should be
renamed. But that's net-next material.

Fixes: 8ac8e8c64b53 ("r8169: make rtl8169_down central chip quiesce function")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

Applied.