net: phy: Check for read errors in SIOCGMIIREG

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>

drivers/net/phy/phy.c

@@ -342,14 +342,19 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 		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: