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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jeremy Linton <jeremy.linton@arm.com>,
        Peter Robinson <pbrobinson@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.16 058/121] net: bcmgenet: Dont claim WOL when its not available
Date:   Mon, 14 Mar 2022 12:54:01 +0100
Message-Id: <20220314112745.745078143@linuxfoundation.org>
In-Reply-To: <20220314112744.120491875@linuxfoundation.org>
References: <20220314112744.120491875@linuxfoundation.org>
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From: Jeremy Linton <jeremy.linton@arm.com>

[ Upstream commit 00b022f8f876a3a036b0df7f971001bef6398605 ]

Some of the bcmgenet platforms don't correctly support WOL, yet
ethtool returns:

"Supports Wake-on: gsf"

which is false.

Ideally if there isn't a wol_irq, or there is something else that
keeps the device from being able to wakeup it should display:

"Supports Wake-on: d"

This patch checks whether the device can wakup, before using the
hard-coded supported flags. This corrects the ethtool reporting, as
well as the WOL configuration because ethtool verifies that the mode
is supported before attempting it.

Fixes: c51de7f3976b ("net: bcmgenet: add Wake-on-LAN support code")
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220310045535.224450-1-jeremy.linton@arm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
index e31a5a397f11..f55d9d9c01a8 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
@@ -40,6 +40,13 @@
 void bcmgenet_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
+	struct device *kdev = &priv->pdev->dev;
+
+	if (!device_can_wakeup(kdev)) {
+		wol->supported = 0;
+		wol->wolopts = 0;
+		return;
+	}
 
 	wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE | WAKE_FILTER;
 	wol->wolopts = priv->wolopts;
-- 
2.34.1