[PATCH 4.19 18/86] net: sfp: ignore disabled SFP node

Greg Kroah-Hartman
2022-02-07T11:23:15Z

From: Marek Behún <kabel@kernel.org>

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@kernel.org>
Cc: stable@vger.kernel.org # 2203cbf2c8b5 ("net: sfp: move fwnode parsing into sfp-bus layer")
Signed-off-by: David S. Miller <davem@davemloft.net>
[ backport to 4.19 ]
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/phy/phylink.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -554,6 +554,11 @@ static int phylink_register_sfp(struct p
return ret;
}

+ if (!fwnode_device_is_available(ref.fwnode)) {
+ fwnode_handle_put(ref.fwnode);
+ return 0;
+ }
+
pl->sfp_bus = sfp_register_upstream(ref.fwnode, pl->netdev, pl,
&sfp_phylink_ops);
if (!pl->sfp_bus)