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[4.14] net: sfp: ignore disabled SFP node

Message ID 20220129160946.11423-1-marek.behun@nic.cz
State New
Headers show
Series [4.14] net: sfp: ignore disabled SFP node | expand

Commit Message

Marek Behún Jan. 29, 2022, 4:09 p.m. UTC 
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 4.14 ]
Signed-off-by: Marek Behún <kabel@kernel.org>
---
 drivers/net/phy/phylink.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 89d8efe8753e..a045fb3a698b 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -514,6 +514,11 @@  static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
 	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)