linux-kernel - [PATCH v4 3/5] net: macb: fix macb_get/set

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Message-ID: <4aeebe901fde6db70a5ca12b10e793dd2ee6ce60.1588763703.git.nicolas.ferre@microchip.com>
Date:   Wed, 6 May 2020 13:37:39 +0200
From:   <nicolas.ferre@...rochip.com>
To:     <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
        "Claudiu Beznea" <claudiu.beznea@...rochip.com>,
        <harini.katakam@...inx.com>
CC:     <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <antoine.tenart@...tlin.com>, <f.fainelli@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Subject: [PATCH v4 3/5] net: macb: fix macb_get/set_wol() when moving to phylink

From: Nicolas Ferre <nicolas.ferre@...rochip.com>

Keep previous function goals and integrate phylink actions to them.

phylink_ethtool_get_wol() is not enough to figure out if Ethernet driver
supports Wake-on-Lan.
Initialization of "supported" and "wolopts" members is done in phylink
function, no need to keep them in calling function.

phylink_ethtool_set_wol() return value is not enough to determine
if WoL is enabled for the calling Ethernet driver. Call it first
but don't rely on its return value as most of simple PHY drivers
don't implement a set_wol() function.

Fixes: 7897b071ac3b ("net: macb: convert to phylink")
Signed-off-by: Nicolas Ferre <nicolas.ferre@...rochip.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Cc: Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc: Harini Katakam <harini.katakam@...inx.com>
Cc: Antoine Tenart <antoine.tenart@...tlin.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 53e81ab048ae..24c044dc7fa0 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -2817,21 +2817,23 @@ static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
 {
 	struct macb *bp = netdev_priv(netdev);
 
-	wol->supported = 0;
-	wol->wolopts = 0;
-
-	if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET)
+	if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
 		phylink_ethtool_get_wol(bp->phylink, wol);
+		wol->supported |= WAKE_MAGIC;
+
+		if (bp->wol & MACB_WOL_ENABLED)
+			wol->wolopts |= WAKE_MAGIC;
+	}
 }
 
 static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
 {
 	struct macb *bp = netdev_priv(netdev);
-	int ret;
 
-	ret = phylink_ethtool_set_wol(bp->phylink, wol);
-	if (!ret)
-		return 0;
+	/* Pass the order to phylink layer.
+	 * Don't test return value as set_wol() is often not supported.
+	 */
+	phylink_ethtool_set_wol(bp->phylink, wol);
 
 	if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
 	    (wol->wolopts & ~WAKE_MAGIC))
-- 
2.26.2