Re: [PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes

[kernel test robot]

Hi Kamil,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net/main]
[also build test WARNING on net-next/main linus/master v6.9-rc6 next-20240503]
[cannot apply to horms-ipvs/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kamil-Hor-k-2N/net-phy-bcm54811-New-link-mode-for-BroadR-Reach/20240503-164308
base:   net/main
patch link:    https://lore.kernel.org/r/20240503083719.899312-4-kamilh%40axis.com
patch subject: [PATCH v2 3/3] net: phy: bcm-phy-lib: Implement BroadR-Reach link modes
config: powerpc-randconfig-r081-20240504 (https://download.01.org/0day-ci/archive/20240504/202405040748.9mCHwtzA-lkp@xxxxxxxxx/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 37ae4ad0eef338776c7e2cffb3896153d43dcd90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240504/202405040748.9mCHwtzA-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405040748.9mCHwtzA-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/phy/broadcom.c:13:
   In file included from drivers/net/phy/bcm-phy-lib.h:9:
   In file included from include/linux/brcmphy.h:5:
   In file included from include/linux/phy.h:16:
   In file included from include/linux/ethtool.h:18:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/cacheflush.h:5:
   In file included from arch/powerpc/include/asm/cacheflush.h:7:
   In file included from include/linux/mm.h:2210:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/net/phy/broadcom.c:619:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
     619 |         if (of_property_read_bool(np, "enet-phy-lane-swap")) {
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/phy/broadcom.c:627:9: note: uninitialized use occurs here
     627 |         return ret;
         |                ^~~
   drivers/net/phy/broadcom.c:619:2: note: remove the 'if' if its condition is always true
     619 |         if (of_property_read_bool(np, "enet-phy-lane-swap")) {
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/phy/broadcom.c:614:9: note: initialize the variable 'ret' to silence this warning
     614 |         int ret;
         |                ^
         |                 = 0
   2 warnings generated.


vim +619 drivers/net/phy/broadcom.c

b0ed0bbfb3046e Kevin Lo         2020-05-16  610  
f1e9c8e593d6ea Kamil Horák - 2N 2024-05-03  611  static int bcm5481x_config_delay_swap(struct phy_device *phydev)
57bb7e222804c6 Anton Vorontsov  2008-03-04  612  {
b14995ac2527b4 Jon Mason        2016-11-04  613  	struct device_node *np = phydev->mdio.dev.of_node;
57bb7e222804c6 Anton Vorontsov  2008-03-04  614  	int ret;
57bb7e222804c6 Anton Vorontsov  2008-03-04  615  
f1e9c8e593d6ea Kamil Horák - 2N 2024-05-03  616  	/* Set up the delay. */
042cb56478152b Tao Ren          2018-11-05  617  	bcm54xx_config_clock_delay(phydev);
57bb7e222804c6 Anton Vorontsov  2008-03-04  618  
b14995ac2527b4 Jon Mason        2016-11-04 @619  	if (of_property_read_bool(np, "enet-phy-lane-swap")) {
b14995ac2527b4 Jon Mason        2016-11-04  620  		/* Lane Swap - Undocumented register...magic! */
b14995ac2527b4 Jon Mason        2016-11-04  621  		ret = bcm_phy_write_exp(phydev, MII_BCM54XX_EXP_SEL_ER + 0x9,
b14995ac2527b4 Jon Mason        2016-11-04  622  					0x11B);
b14995ac2527b4 Jon Mason        2016-11-04  623  		if (ret < 0)
b14995ac2527b4 Jon Mason        2016-11-04  624  			return ret;
b14995ac2527b4 Jon Mason        2016-11-04  625  	}
b14995ac2527b4 Jon Mason        2016-11-04  626  
57bb7e222804c6 Anton Vorontsov  2008-03-04  627  	return ret;
57bb7e222804c6 Anton Vorontsov  2008-03-04  628  }
57bb7e222804c6 Anton Vorontsov  2008-03-04  629  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki