4.20-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit 3f1bb6abdf19cfa89860b3bc9e7f31b44b6a0ba1 upstream.
Use the new of_get_compatible_child() helper to look up child nodes to avoid ever matching non-child nodes elsewhere in the tree.
Also fix up the related struct device_node leaks.
Fixes: d8652956cf37 ("net: dsa: realtek-smi: Add Realtek SMI driver") Cc: stable stable@vger.kernel.org # 4.19: 36156f9241cb0 Cc: Linus Walleij linus.walleij@linaro.org Signed-off-by: Johan Hovold johan@kernel.org Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/dsa/realtek-smi.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
--- a/drivers/net/dsa/realtek-smi.c +++ b/drivers/net/dsa/realtek-smi.c @@ -347,16 +347,17 @@ int realtek_smi_setup_mdio(struct realte struct device_node *mdio_np; int ret;
- mdio_np = of_find_compatible_node(smi->dev->of_node, NULL, - "realtek,smi-mdio"); + mdio_np = of_get_compatible_child(smi->dev->of_node, "realtek,smi-mdio"); if (!mdio_np) { dev_err(smi->dev, "no MDIO bus node\n"); return -ENODEV; }
smi->slave_mii_bus = devm_mdiobus_alloc(smi->dev); - if (!smi->slave_mii_bus) - return -ENOMEM; + if (!smi->slave_mii_bus) { + ret = -ENOMEM; + goto err_put_node; + } smi->slave_mii_bus->priv = smi; smi->slave_mii_bus->name = "SMI slave MII"; smi->slave_mii_bus->read = realtek_smi_mdio_read; @@ -371,10 +372,15 @@ int realtek_smi_setup_mdio(struct realte if (ret) { dev_err(smi->dev, "unable to register MDIO bus %s\n", smi->slave_mii_bus->id); - of_node_put(mdio_np); + goto err_put_node; }
return 0; + +err_put_node: + of_node_put(mdio_np); + + return ret; }
static int realtek_smi_probe(struct platform_device *pdev) @@ -457,6 +463,8 @@ static int realtek_smi_remove(struct pla struct realtek_smi *smi = dev_get_drvdata(&pdev->dev);
dsa_unregister_switch(smi->ds); + if (smi->slave_mii_bus) + of_node_put(smi->slave_mii_bus->dev.of_node); gpiod_set_value(smi->reset, 1);
return 0;