Re: [PATCH net-next v15 5/5] net: dsa: motorcomm: Add support for Motorcomm YT922x

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

Hi Kyle,

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/Kyle-Switch/net-dsa-motorcomm-initialize-dsa_switch-based-on-chipid/20261019-190539
base:   net-next/main
patch link:    https://lore.kernel.org/r/20261019110543.2999419-6-kyle.switch%40motor-comm.com
patch subject: [PATCH net-next v15 5/5] net: dsa: motorcomm: Add support for Motorcomm YT922x
config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20261020/202610200942.aPmEAZ8C-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 6719b9e31d6a93099612c474eec76d9f41d0275a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261020/202610200942.aPmEAZ8C-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/202610200942.aPmEAZ8C-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/dsa/motorcomm/chip.c:2755:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
    2755 |         default:
         |         ^
   drivers/net/dsa/motorcomm/chip.c:2755:2: note: insert '__attribute__((fallthrough));' to silence this warning
    2755 |         default:
         |         ^
         |         __attribute__((fallthrough)); 
   drivers/net/dsa/motorcomm/chip.c:2755:2: note: insert 'break;' to avoid fall-through
    2755 |         default:
         |         ^
         |         break; 
   1 warning generated.


vim +2755 drivers/net/dsa/motorcomm/chip.c

  2730	
  2731	static int
  2732	yt922x_port_config(struct yt921x_priv *priv, int port, unsigned int mode,
  2733			   phy_interface_t interface)
  2734	{
  2735		struct device *dev = yt921x_priv_to_device(priv);
  2736		const struct yt921x_info *info = priv->info;
  2737		struct yt921x_port *pp = &priv->ports[port];
  2738	
  2739		if (BIT(port) & info->internal_mask) {
  2740			if (interface != PHY_INTERFACE_MODE_INTERNAL)
  2741				goto err;
  2742			return 0;
  2743		}
  2744	
  2745		switch (interface) {
  2746		/* SERDES */
  2747		case PHY_INTERFACE_MODE_SGMII:
  2748		case PHY_INTERFACE_MODE_100BASEX:
  2749		case PHY_INTERFACE_MODE_1000BASEX:
  2750		case PHY_INTERFACE_MODE_2500BASEX:
  2751		case PHY_INTERFACE_MODE_USXGMII:
  2752			if (!(BIT(port) & info->serdes_mask))
  2753				goto err;
  2754			pp->serdes = true;
> 2755		default:
  2756			goto err;
  2757		}
  2758	
  2759		return 0;
  2760	
  2761	err:
  2762		dev_err(dev, "Wrong mode %d on port %d\n", interface, port);
  2763		return -EINVAL;
  2764	}
  2765	

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