Re: [PATCH net-next v11 08/16] net: phy: Introduce generic SFP handling for PHY drivers

[kernel test robot <lkp@intel.com>]

Hi Maxime,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Maxime-Chevallier/dt-bindings-net-Introduce-the-ethernet-connector-description/20250814-221559
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250814135832.174911-9-maxime.chevallier%40bootlin.com
patch subject: [PATCH net-next v11 08/16] net: phy: Introduce generic SFP handling for PHY drivers
config: i386-randconfig-013-20250815 (https://download.01.org/0day-ci/archive/20250815/202508151058.jqJsn9VB-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250815/202508151058.jqJsn9VB-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508151058.jqJsn9VB-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/phy/phy_device.c:1625:47: warning: variable 'iface' is uninitialized when used here [-Wuninitialized]
    1625 |                 return port->ops->configure_mii(port, true, iface);
         |                                                             ^~~~~
   drivers/net/phy/phy_device.c:1597:2: note: variable 'iface' is declared here
    1597 |         phy_interface_t iface;
         |         ^
   1 warning generated.


vim +/iface +1625 drivers/net/phy/phy_device.c

  1589	
  1590	static int phy_sfp_module_insert(void *upstream, const struct sfp_eeprom_id *id)
  1591	{
  1592		struct phy_device *phydev = upstream;
  1593		struct phy_port *port;
  1594	
  1595		__ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support);
  1596		DECLARE_PHY_INTERFACE_MASK(interfaces);
  1597		phy_interface_t iface;
  1598	
  1599		linkmode_zero(sfp_support);
  1600	
  1601		port = phy_get_sfp_port(phydev);
  1602		if (!port)
  1603			return -EINVAL;
  1604	
  1605		sfp_parse_support(phydev->sfp_bus, id, sfp_support, interfaces);
  1606	
  1607		if (phydev->n_ports == 1)
  1608			phydev->port = sfp_parse_port(phydev->sfp_bus, id, sfp_support);
  1609	
  1610		linkmode_and(sfp_support, port->supported, sfp_support);
  1611		linkmode_and(interfaces, interfaces, port->interfaces);
  1612	
  1613		if (linkmode_empty(sfp_support)) {
  1614			dev_err(&phydev->mdio.dev, "incompatible SFP module inserted, no common linkmode\n");
  1615			return -EINVAL;
  1616		}
  1617	
  1618		/* Check that this interface is supported */
  1619		if (!test_bit(iface, port->interfaces)) {
  1620			dev_err(&phydev->mdio.dev, "PHY %s does not support the SFP module's requested MII interfaces\n", phydev_name(phydev));
  1621			return -EINVAL;
  1622		}
  1623	
  1624		if (port->ops && port->ops->configure_mii)
> 1625			return port->ops->configure_mii(port, true, iface);
  1626	
  1627		return 0;
  1628	}
  1629	

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