Hi Calvin,

url:    https://github.com/0day-ci/linux/commits/Calvin-Johnson/ACPI-support-for-dpaa2-driver/20210209-084334
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 6626a0266566c5aea16178c5e6cd7fc4db3f2f56
config: i386-randconfig-m021-20210209 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
drivers/net/phy/mdio_bus.c:134 fwnode_mdiobus_register_phy() error: uninitialized symbol 'mii_ts'.

Old smatch warnings:
drivers/net/phy/mdio_bus.c:157 fwnode_mdiobus_register_phy() error: uninitialized symbol 'mii_ts'.
drivers/net/phy/mdio_bus.c:167 fwnode_mdiobus_register_phy() error: uninitialized symbol 'mii_ts'.

vim +/mii_ts +134 drivers/net/phy/mdio_bus.c

36305d64c94998 Calvin Johnson 2021-02-08  110  int fwnode_mdiobus_register_phy(struct mii_bus *bus,
36305d64c94998 Calvin Johnson 2021-02-08  111  				struct fwnode_handle *child, u32 addr)
36305d64c94998 Calvin Johnson 2021-02-08  112  {
36305d64c94998 Calvin Johnson 2021-02-08  113  	struct mii_timestamper *mii_ts;
36305d64c94998 Calvin Johnson 2021-02-08  114  	struct phy_device *phy;
36305d64c94998 Calvin Johnson 2021-02-08  115  	bool is_c45 = false;
36305d64c94998 Calvin Johnson 2021-02-08  116  	u32 phy_id;
36305d64c94998 Calvin Johnson 2021-02-08  117  	int rc;
36305d64c94998 Calvin Johnson 2021-02-08  118  
36305d64c94998 Calvin Johnson 2021-02-08  119  	if (is_of_node(child)) {
36305d64c94998 Calvin Johnson 2021-02-08  120  		mii_ts = of_find_mii_timestamper(to_of_node(child));
36305d64c94998 Calvin Johnson 2021-02-08  121  		if (IS_ERR(mii_ts))
36305d64c94998 Calvin Johnson 2021-02-08  122  			return PTR_ERR(mii_ts);
36305d64c94998 Calvin Johnson 2021-02-08  123  	}

"mii_ts" is not initialized on the else path.

36305d64c94998 Calvin Johnson 2021-02-08  124  
36305d64c94998 Calvin Johnson 2021-02-08  125  	rc = fwnode_property_match_string(child, "compatible", "ethernet-phy-ieee802.3-c45");
36305d64c94998 Calvin Johnson 2021-02-08  126  	if (rc >= 0)
36305d64c94998 Calvin Johnson 2021-02-08  127  		is_c45 = true;
36305d64c94998 Calvin Johnson 2021-02-08  128  
36305d64c94998 Calvin Johnson 2021-02-08  129  	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
36305d64c94998 Calvin Johnson 2021-02-08  130  		phy = get_phy_device(bus, addr, is_c45);
36305d64c94998 Calvin Johnson 2021-02-08  131  	else
36305d64c94998 Calvin Johnson 2021-02-08  132  		phy = phy_device_create(bus, addr, phy_id, 0, NULL);
36305d64c94998 Calvin Johnson 2021-02-08  133  	if (IS_ERR(phy)) {
36305d64c94998 Calvin Johnson 2021-02-08 @134  		if (mii_ts && is_of_node(child))
                                                            ^^^^^^

36305d64c94998 Calvin Johnson 2021-02-08  135  			unregister_mii_timestamper(mii_ts);
36305d64c94998 Calvin Johnson 2021-02-08  136  		return PTR_ERR(phy);
36305d64c94998 Calvin Johnson 2021-02-08  137  	}
36305d64c94998 Calvin Johnson 2021-02-08  138  
36305d64c94998 Calvin Johnson 2021-02-08  139  	if (is_acpi_node(child)) {
36305d64c94998 Calvin Johnson 2021-02-08  140  		phy->irq = bus->irq[addr];
36305d64c94998 Calvin Johnson 2021-02-08  141  

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org