[PATCH] net: phy: only remove owned topology entries

[Jiale Yao <yaojiale02@163.com>]

phy_link_topo_add_phy() can fail to insert a PHY when its saved index is
already occupied.  Its caller may subsequently run the normal detach
path.  phy_link_topo_del_phy() then unconditionally removes the entry at
that index, including its ports, even though the entry belongs to a
different PHY.

Look up the topology entry first and only remove the PHY and its ports
when the entry belongs to the PHY being detached.

Fixes: 384968786909 ("net: phy: Introduce ethernet link topology representation")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
---
 drivers/net/phy/phy_link_topology.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/phy/phy_link_topology.c b/drivers/net/phy/phy_link_topology.c
index 214ccce23cf6..175eef44cf54 100644
--- a/drivers/net/phy/phy_link_topology.c
+++ b/drivers/net/phy/phy_link_topology.c
@@ -185,6 +185,10 @@ void phy_link_topo_del_phy(struct net_device *dev,
 	if (!topo)
 		return;
 
+	pdn = xa_load(&topo->phys, phy->phyindex);
+	if (!pdn || pdn->phy != phy)
+		return;
+
 	list_for_each_entry(port, &phy->ports, head)
 		phy_link_topo_del_port(dev, port);
 
-- 
2.34.1