When reading registers from the PHY using the SIOCGMIIREG IOCTL any
errors returned from either mdiobus_read() or mdiobus_c45_read() are
ignored, and parts of the returned error is passed as the register value
back to user-space.
For example, if mdiobus_c45_read() is used with a bus that do not
implement the read_c45() callback -EOPNOTSUPP is returned. This is
however directly stored in mii_data->val_out and returned as the
registers content. As val_out is a u16 the error code is truncated and
returned as a plausible register value.
Fix this by first checking the return value for errors before returning
it as the register content.
Before this patch,
# phytool read eth0/0:1/0
0xffa1
After this change,
$ phytool read eth0/0:1/0
error: phy_read (-95)
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20240903171536.628930-1-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
if (mdio_phy_id_is_c45(mii_data->phy_id)) {
prtad = mdio_phy_id_prtad(mii_data->phy_id);
devad = mdio_phy_id_devad(mii_data->phy_id);
- mii_data->val_out = mdiobus_c45_read(
- phydev->mdio.bus, prtad, devad,
- mii_data->reg_num);
+ ret = mdiobus_c45_read(phydev->mdio.bus, prtad, devad,
+ mii_data->reg_num);
+
} else {
- mii_data->val_out = mdiobus_read(
- phydev->mdio.bus, mii_data->phy_id,
- mii_data->reg_num);
+ ret = mdiobus_read(phydev->mdio.bus, mii_data->phy_id,
+ mii_data->reg_num);
}
+
+ if (ret < 0)
+ return ret;
+
+ mii_data->val_out = ret;
+
return 0;
case SIOCSMIIREG: