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authorMarkus Stockhausen2026-02-10 18:49:44 +0000
committerRobert Marko2026-02-13 11:53:46 +0000
commitdf939b3316167b74b07a92816b641b67d7ecea75 (patch)
tree0ca1c5ab695017bd22249a0bd7fcce9120ab6696
parentc092ca445a9a8ad1d21fb79a5c3974cb3455654a (diff)
downloadopenwrt-df939b3316167b74b07a92816b641b67d7ecea75.tar.gz
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 <markus.stockhausen@gmx.de> Link: https://github.com/openwrt/openwrt/pull/21968 Signed-off-by: Robert Marko <robimarko@gmail.com>
-rw-r--r--target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c4
1 files changed, 4 insertions, 0 deletions
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 2387b91994..e846c00b60 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];