netdev - [PATCH net] net: sfp: ignore disabled SFP node

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Date:   Wed, 19 Jan 2022 17:44:55 +0100
From:   Marek Behún <kabel@...nel.org>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     Russell King <rmk+kernel@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Marek Behún <kabel@...nel.org>,
        stable@...r.kernel.org
Subject: [PATCH net] net: sfp: ignore disabled SFP node

Commit ce0aa27ff3f6 ("sfp: add sfp-bus to bridge between network devices
and sfp cages") added code which finds SFP bus DT node even if the node
is disabled with status = "disabled". Because of this, when phylink is
created, it ends with non-null .sfp_bus member, even though the SFP
module is not probed (because the node is disabled).

We need to ignore disabled SFP bus node.

Fixes: ce0aa27ff3f6 ("sfp: add sfp-bus to bridge between network devices and sfp cages")
Signed-off-by: Marek Behún <kabel@...nel.org>
Cc: stable@...r.kernel.org # 2203cbf2c8b5 ("net: sfp: move fwnode parsing into sfp-bus layer")
---
 drivers/net/phy/sfp-bus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index 0c6c0d1843bc..c1512c9925a6 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -651,6 +651,11 @@ struct sfp_bus *sfp_bus_find_fwnode(struct fwnode_handle *fwnode)
 	else if (ret < 0)
 		return ERR_PTR(ret);
 
+	if (!fwnode_device_is_available(ref.fwnode)) {
+		fwnode_handle_put(ref.fwnode);
+		return NULL;
+	}
+
 	bus = sfp_bus_get(ref.fwnode);
 	fwnode_handle_put(ref.fwnode);
 	if (!bus)
-- 
2.34.1