From: Markus Stockhausen Date: Tue, 10 Feb 2026 18:49:44 +0000 (+0100) Subject: realtek: mdio: prevent WARN_ONCE() during bus scan X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df939b3316167b74b07a92816b641b67d7ecea75;p=thirdparty%2Fopenwrt.git realtek: mdio: prevent WARN_ONCE() during bus scan The mdio bus detection will be changed from DTS based detection to autoscan. To avoid spurious WARN_ONCE() messages return -EIO for reads to register 2 during C22 scan when phy is on a c45 based bus. The C45 rescan afterwards will detect the phy normally. Signed-off-by: Markus Stockhausen Link: https://github.com/openwrt/openwrt/pull/21968 Signed-off-by: Robert Marko --- diff --git a/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c b/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c index 2387b91994e..e846c00b605 100644 --- a/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c +++ b/target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c @@ -504,6 +504,10 @@ static int rtmdio_read(struct mii_bus *bus, int addr, int regnum) if (addr >= ctrl->cfg->cpu_port) return -ENODEV; + /* prevent WARN_ONCE() during scan */ + if (ctrl->smi_bus[addr] >=0 && ctrl->smi_bus_isc45[ctrl->smi_bus[addr]] && regnum == 2) + return -EIO; + if (regnum == RTMDIO_PAGE_SELECT && ctrl->page[addr] != ctrl->cfg->raw_page) return ctrl->page[addr];