[PATCH 4.14 16/69] net: sfp: ignore disabled SFP node

[Greg Kroah-Hartman]

From: Marek Behún <kabel@xxxxxxxxxx>

commit 2148927e6ed43a1667baf7c2ae3e0e05a44b51a0 upstream.

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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 2203cbf2c8b5 ("net: sfp: move fwnode parsing into sfp-bus layer")
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[ backport to 4.14 ]
Signed-off-by: Marek Behún <kabel@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/phy/phylink.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -514,6 +514,11 @@ static int phylink_register_sfp(struct p
 	if (!sfp_np)
 		return 0;
 
+	if (!of_device_is_available(sfp_np)) {
+		of_node_put(sfp_np);
+		return 0;
+	}
+
 	pl->sfp_bus = sfp_register_upstream(sfp_np, pl->netdev, pl,
 					    &sfp_phylink_ops);
 	if (!pl->sfp_bus)