Hi Ioana,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]
[also build test WARNING on v5.2-rc2 next-20190524]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ioana-Ciornei/Decoupling-PHYLINK-from-struct-net_device/20190528-061507
config: x86_64-randconfig-x004201921-201921 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/net//phy/phy_device.c: In function 'phy_connect_direct':
>> drivers/net//phy/phy_device.c:952:10: warning: return makes integer from pointer without a cast [-Wint-conversion]
      return ERR_PTR(-EINVAL);
             ^~~~~~~~~~~~~~~~

vim +952 drivers/net//phy/phy_device.c

   937	
   938	/**
   939	 * phy_connect_direct - connect an ethernet device to a specific phy_device
   940	 * @dev: the network device to connect
   941	 * @phydev: the pointer to the phy device
   942	 * @handler: callback function for state change notifications
   943	 * @interface: PHY device's interface
   944	 */
   945	int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
   946			       void (*handler)(struct net_device *),
   947			       phy_interface_t interface)
   948	{
   949		int rc;
   950	
   951		if (!dev)
 > 952			return ERR_PTR(-EINVAL);
   953	
   954		rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
   955		if (rc)
   956			return rc;
   957	
   958		phy_prepare_link(phydev, handler);
   959		if (phy_interrupt_is_valid(phydev))
   960			phy_request_interrupt(phydev);
   961	
   962		return 0;
   963	}
   964	EXPORT_SYMBOL(phy_connect_direct);
   965	

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