Subject: Re: [PATCH net-next 2/2] net: phy: Introduce Airoha AN8801/R Gigabit Ethernet PHY driver

From: kernel test robot <[email-masked]>
Date: Thu, 5 Mar 2026 06:13:31 +0800

Hi Louis-Alexis,

kernel test robot noticed the following build warnings:

[auto build test WARNING on ed0abfe93fd135dac223e87a3c945017b1fa8bfc]

url:    https://github.com/intel-lab-lkp/linux/commits/Louis-Alexis-Eyraud/dt-bindings-net-Add-support-for-Airoha-AN8801-R-GbE-PHY/20260304-174023
base:   ed0abfe93fd135dac223e87a3c945017b1fa8bfc
patch link:    https://lore.kernel.org/r/20260304-add-airoha-an8801-support-v1-2-0ae4ee5a2f9d%40collabora.com
patch subject: [PATCH net-next 2/2] net: phy: Introduce Airoha AN8801/R Gigabit Ethernet PHY driver
config: sparc64-allmodconfig (https://download.01.org/0day-ci/archive/20260305/[email-masked]/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9a109fbb6e184ec9bcce10615949f598f4c974a9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260305/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

All warnings (new ones prefixed by >>):

>> drivers/net/phy/air_an8801.c:258:6: warning: variable 'pbus_data_h' is uninitialized when used here [-Wuninitialized]
     258 |         if (pbus_data_h < 0)
         |             ^~~~~~~~~~~
   drivers/net/phy/air_an8801.c:240:30: note: initialize the variable 'pbus_data_h' to silence this warning
     240 |         int pbus_data_l, pbus_data_h;
         |                                     ^
         |                                      = 0
   1 warning generated.

vim +/pbus_data_h +258 drivers/net/phy/air_an8801.c

   236	
   237	static int __air_buckpbus_reg_read(struct phy_device *phydev,
   238					   u32 addr, u32 *data)
   239	{
   240		int pbus_data_l, pbus_data_h;
   241		int ret;
   242	
   243		addr |= AN8801_PBUS_ACCESS;
   244	
   245		ret = __phy_write(phydev, AIR_BPBUS_MODE, MII_MMD_CTRL_ADDR);
   246		if (ret < 0)
   247			return ret;
   248	
   249		ret = __phy_write(phydev, AIR_BPBUS_RD_ADDR_HIGH, upper_16_bits(addr));
   250		if (ret < 0)
   251			return ret;
   252	
   253		ret = __phy_write(phydev, AIR_BPBUS_RD_ADDR_LOW, lower_16_bits(addr));
   254		if (ret < 0)
   255			return ret;
   256	
   257		ret = __phy_read(phydev, AIR_BPBUS_RD_DATA_HIGH);
 > 258		if (pbus_data_h < 0)
   259			return pbus_data_h;
   260	
   261		pbus_data_l = __phy_read(phydev, AIR_BPBUS_RD_DATA_LOW);
   262		if (pbus_data_l < 0)
   263			return pbus_data_l;
   264	
   265		*data = (pbus_data_h << 16) | pbus_data_l;
   266		return 0;
   267	}
   268	

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