Re: [PATCH net-next v6 3/3] net: dsa: yt921x: Add support for Motorcomm YT921x

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

Hi David,

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/David-Yang/dt-bindings-net-dsa-yt921x-Add-Motorcomm-YT921x-switch-support/20250824-085750
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250824005116.2434998-4-mmyangfl%40gmail.com
patch subject: [PATCH net-next v6 3/3] net: dsa: yt921x: Add support for Motorcomm YT921x
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20250825/202508250002.afAgRCmk-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250825/202508250002.afAgRCmk-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/202508250002.afAgRCmk-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/dsa/yt921x.c: In function 'yt921x_port_down':
>> drivers/net/dsa/yt921x.c:2683:13: warning: variable 'mask' set but not used [-Wunused-but-set-variable]
    2683 |         u32 mask;
         |             ^~~~


vim +/mask +2683 drivers/net/dsa/yt921x.c

  2680	
  2681	static int yt921x_port_down(struct yt921x_priv *priv, int port)
  2682	{
> 2683		u32 mask;
  2684		u32 ctrl;
  2685		int res;
  2686	
  2687		ctrl = YT921X_PORT_LINK | YT921X_PORT_RX_MAC_EN | YT921X_PORT_TX_MAC_EN;
  2688		res = yt921x_smi_clear_bits(priv, YT921X_PORTn_CTRL(port), ctrl);
  2689		if (res)
  2690			return res;
  2691	
  2692		if (yt921x_port_is_external(port)) {
  2693			ctrl = YT921X_SGMII_LINK;
  2694			res = yt921x_smi_clear_bits(priv, YT921X_SGMIIn(port), ctrl);
  2695			if (res)
  2696				return res;
  2697	
  2698			mask = YT921X_XMII_LINK;
  2699			res = yt921x_smi_clear_bits(priv, YT921X_XMIIn(port), ctrl);
  2700			if (res)
  2701				return res;
  2702		}
  2703	
  2704		return 0;
  2705	}
  2706	

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