From 543d917f691ab06885ee779c862065899eaa4251 Mon Sep 17 00:00:00 2001 From: Yang Yingliang Date: Thu, 24 Nov 2022 23:01:30 +0800 Subject: [PATCH] net: mdiobus: fix unbalanced node reference count [ Upstream commit cdde1560118f82498fc9e9a7c1ef7f0ef7755891 ] I got the following report while doing device(mscc-miim) load test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled: OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0 If the 'fwnode' is not an acpi node, the refcount is get in fwnode_mdiobus_phy_device_register(), but it has never been put when the device is freed in the normal path. So call fwnode_handle_put() in phy_device_release() to avoid leak. If it's an acpi node, it has never been get, but it's put in the error path, so call fwnode_handle_get() before phy_device_register() to keep get/put operation balanced. Fixes: bc1bee3b87ee ("net: mdiobus: Introduce fwnode_mdiobus_register_phy()") Signed-off-by: Yang Yingliang Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20221124150130.609420-1-yangyingliang@huawei.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/mdio/fwnode_mdio.c | 2 +- drivers/net/phy/phy_device.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c index 1c1584f..40e745a 100644 --- a/drivers/net/mdio/fwnode_mdio.c +++ b/drivers/net/mdio/fwnode_mdio.c @@ -120,7 +120,7 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus, /* Associate the fwnode with the device structure so it * can be looked up later. */ - phy->mdio.dev.fwnode = child; + phy->mdio.dev.fwnode = fwnode_handle_get(child); /* All data is now stored in the phy struct, so register it */ rc = phy_device_register(phy); diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 1dd521c..996842a 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -215,6 +215,7 @@ static void phy_mdio_device_free(struct mdio_device *mdiodev) static void phy_device_release(struct device *dev) { + fwnode_handle_put(dev->fwnode); kfree(to_phy_device(dev)); } -- 2.7.4