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realtek: mdio: harden mdio probing

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Do better error checks during bus probing. Give meaningful return codes
in case of invalid DTS data (EINVAL instead of ENODEV). Decrease node
reference in case of errors.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21968
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Markus Stockhausen 2026-02-10 17:16:48 +01:00 • committed by Robert Marko
parent 64d72c7451
commit 45fa6e3175
1 changed files with 8 additions and 6 deletions
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14
target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c
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@ -913,18 +913,20 @@ static int rtmdio_probe(struct platform_device *pdev)
if (of_property_read_u32(dn, "reg", &addr))
continue;
if (addr >= ctrl->cfg->cpu_port) {
pr_err("%s: illegal port number %d\n", __func__, addr);
return -ENODEV;
if (addr < 0 || addr >= ctrl->cfg->cpu_port) {
dev_err(dev, "illegal port number %d\n", addr);
of_node_put(dn);
return -EINVAL;
}
of_property_read_u32(dn->parent, "reg", &ctrl->smi_bus[addr]);
if (of_property_read_u32(dn, "realtek,smi-address", &ctrl->smi_addr[addr]))
ctrl->smi_addr[addr] = addr;
if (ctrl->smi_bus[addr] >= RTMDIO_MAX_SMI_BUS) {
pr_err("%s: illegal SMI bus number %d\n", __func__, ctrl->smi_bus[addr]);
return -ENODEV;
if (ctrl->smi_bus[addr] < 0 || ctrl->smi_bus[addr] >= RTMDIO_MAX_SMI_BUS) {
dev_err(dev, "illegal SMI bus number %d\n", ctrl->smi_bus[addr]);
of_node_put(dn);
return -EINVAL;
}
if (of_device_is_compatible(dn, "ethernet-phy-ieee802.3-c45"))