[jpirko-mlxsw:jiri_devel_lc_dev 2/15] drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c:94:3: error: void function 'mlxsw_linecard_bdev_del' should not return a value

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

tree:   https://github.com/jpirko/linux_mlxsw jiri_devel_lc_dev
head:   b3fdf991f2ce5b1a4e7f527fcfc27c9d413ae566
commit: 1a2503c635b5bd91f6eb2d2520960d609df0e6ee [2/15] mlxsw: core_linecards: Introduce per line card auxiliary device
config: riscv-randconfig-r042-20220616 (https://download.01.org/0day-ci/archive/20220616/202206161832.71XjiKsD-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project f0e608de27b3d568000046eebf3712ab542979d6)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/jpirko/linux_mlxsw/commit/1a2503c635b5bd91f6eb2d2520960d609df0e6ee
        git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw
        git fetch --no-tags jpirko-mlxsw jiri_devel_lc_dev
        git checkout 1a2503c635b5bd91f6eb2d2520960d609df0e6ee
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/net/ethernet/mellanox/mlxsw/

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

All errors (new ones prefixed by >>):

   In file included from drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c:13:
   In file included from include/net/devlink.h:14:
   In file included from include/linux/netdevice.h:38:
   In file included from include/net/net_namespace.h:40:
   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:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c:13:
   In file included from include/net/devlink.h:14:
   In file included from include/linux/netdevice.h:38:
   In file included from include/net/net_namespace.h:40:
   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:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c:13:
   In file included from include/net/devlink.h:14:
   In file included from include/linux/netdevice.h:38:
   In file included from include/net/net_namespace.h:40:
   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:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c:94:3: error: void function 'mlxsw_linecard_bdev_del' should not return a value [-Wreturn-type]
                   return NULL;
                   ^      ~~~~
   7 warnings and 1 error generated.


vim +/mlxsw_linecard_bdev_del +94 drivers/net/ethernet/mellanox/mlxsw/core_linecard_dev.c

    88	
    89	void mlxsw_linecard_bdev_del(struct mlxsw_linecard *linecard)
    90	{
    91		struct mlxsw_linecard_bdev *linecard_bdev = linecard->bdev;
    92	
    93		if (!linecard_bdev)
  > 94			return NULL;
    95		auxiliary_device_delete(&linecard_bdev->adev);
    96		auxiliary_device_uninit(&linecard_bdev->adev);
    97		linecard->bdev = NULL;
    98	}
    99	

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