[PATCH 2/2] alx: add disable_wol paramenter

[AceLan Kao]

The WoL feature was reported broken and will lead to
the system resume immediately after suspending.
This symptom is not happening on every system, so adding
disable_wol option and disable WoL by default to prevent the issue from
happening again.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=61651
Signed-off-by: AceLan Kao <acelan.kao@xxxxxxxxxxxxx>
---
 drivers/net/ethernet/atheros/alx/ethtool.c | 7 ++++++-
 drivers/net/ethernet/atheros/alx/main.c    | 5 +++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/atheros/alx/ethtool.c b/drivers/net/ethernet/atheros/alx/ethtool.c
index 859e272..e50129d 100644
--- a/drivers/net/ethernet/atheros/alx/ethtool.c
+++ b/drivers/net/ethernet/atheros/alx/ethtool.c
@@ -46,6 +46,8 @@
 #include "reg.h"
 #include "hw.h"
 
+extern const bool disable_wol;
+
 /* The order of these strings must match the order of the fields in
  * struct alx_hw_stats
  * See hw.h
@@ -315,6 +317,9 @@ static void alx_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
 	struct alx_priv *alx = netdev_priv(netdev);
 	struct alx_hw *hw = &alx->hw;
 
+	if (disable_wol)
+		return;
+
 	wol->supported = WAKE_MAGIC | WAKE_PHY;
 	wol->wolopts = 0;
 
@@ -329,7 +334,7 @@ static int alx_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
 	struct alx_priv *alx = netdev_priv(netdev);
 	struct alx_hw *hw = &alx->hw;
 
-	if (wol->wolopts & ~(WAKE_MAGIC | WAKE_PHY))
+	if (disable_wol || (wol->wolopts & ~(WAKE_MAGIC | WAKE_PHY)))
 		return -EOPNOTSUPP;
 
 	hw->sleep_ctrl = 0;
diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c
index c0e2bb2..c27fdf7 100644
--- a/drivers/net/ethernet/atheros/alx/main.c
+++ b/drivers/net/ethernet/atheros/alx/main.c
@@ -51,6 +51,11 @@
 
 const char alx_drv_name[] = "alx";
 
+/* disable WoL by default */
+bool disable_wol = 1;
+module_param(disable_wol, bool, 0);
+MODULE_PARM_DESC(disable_wol, "Disable Wake on Lan feature");
+
 static void alx_free_txbuf(struct alx_tx_queue *txq, int entry)
 {
 	struct alx_buffer *txb = &txq->bufs[entry];
-- 
2.7.4