linux-kernel - [PATCH 5.17 043/114] net: dsa: bcm_sf2: Fix Wake-on-LAN with mac_link

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Message-Id: <20220516193626.730276261@linuxfoundation.org>
Date:   Mon, 16 May 2022 21:36:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 043/114] net: dsa: bcm_sf2: Fix Wake-on-LAN with mac_link_down()

From: Florian Fainelli <f.fainelli@...il.com>

[ Upstream commit b7be130c5d52e5224ac7d89568737b37b4c4b785 ]

After commit 2d1f90f9ba83 ("net: dsa/bcm_sf2: fix incorrect usage of
state->link") the interface suspend path would call our mac_link_down()
call back which would forcibly set the link down, thus preventing
Wake-on-LAN packets from reaching our management port.

Fix this by looking at whether the port is enabled for Wake-on-LAN and
not clearing the link status in that case to let packets go through.

Fixes: 2d1f90f9ba83 ("net: dsa/bcm_sf2: fix incorrect usage of state->link")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Link: https://lore.kernel.org/r/20220512021731.2494261-1-f.fainelli@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/bcm_sf2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 6afb5db8244c..6d15a743219f 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -833,6 +833,9 @@ static void bcm_sf2_sw_mac_link_down(struct dsa_switch *ds, int port,
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
 	u32 reg, offset;
 
+	if (priv->wol_ports_mask & BIT(port))
+		return;
+
 	if (port != core_readl(priv, CORE_IMP0_PRT_ID)) {
 		if (priv->type == BCM4908_DEVICE_ID ||
 		    priv->type == BCM7445_DEVICE_ID)
-- 
2.35.1