Re: [PATCH v9 2/2] iio: light: Add support for ltrf216a sensor

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

Hi Shreeya,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on jic23-iio/togreg]
[also build test WARNING on linus/master v5.19-rc6 next-20220715]
[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/Shreeya-Patel/Add-LTRF216A-Driver/20220716-210741
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: s390-randconfig-r023-20220717 (https://download.01.org/0day-ci/archive/20220717/202207170630.lcfpHu8v-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 07022e6cf9b5b3baa642be53d0b3c3f1c403dbfd)
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 s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/6db354952f0013dd461d2338761ef8ae3399f2d8
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Shreeya-Patel/Add-LTRF216A-Driver/20220716-210741
        git checkout 6db354952f0013dd461d2338761ef8ae3399f2d8
        # 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=s390 SHELL=/bin/bash drivers/iio/light/

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

All warnings (new ones prefixed by >>):

   In file included from drivers/iio/light/ltrf216a.c:19:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:75:
   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/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from drivers/iio/light/ltrf216a.c:19:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:75:
   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/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from drivers/iio/light/ltrf216a.c:19:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:13:
   In file included from arch/s390/include/asm/io.h:75:
   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:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
>> drivers/iio/light/ltrf216a.c:188:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (on) {
               ^~
   drivers/iio/light/ltrf216a.c:199:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/iio/light/ltrf216a.c:188:2: note: remove the 'if' if its condition is always true
           if (on) {
           ^~~~~~~~
   drivers/iio/light/ltrf216a.c:186:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   13 warnings generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for DRM_DP_AUX_BUS
   Depends on HAS_IOMEM && DRM && OF
   Selected by
   - DRM_MSM && HAS_IOMEM && DRM && (ARCH_QCOM || SOC_IMX5 || COMPILE_TEST && COMMON_CLK && IOMMU_SUPPORT && (QCOM_OCMEM || QCOM_OCMEM && (QCOM_LLCC || QCOM_LLCC && (QCOM_COMMAND_DB || QCOM_COMMAND_DB


vim +188 drivers/iio/light/ltrf216a.c

   182	
   183	static int ltrf216a_set_power_state(struct ltrf216a_data *data, bool on)
   184	{
   185		struct device *dev = &data->client->dev;
   186		int ret;
   187	
 > 188		if (on) {
   189			ret = pm_runtime_resume_and_get(dev);
   190			if (ret) {
   191				dev_err(dev, "failed to resume runtime PM: %d\n", ret);
   192				return ret;
   193			}
   194		} else {
   195			pm_runtime_mark_last_busy(dev);
   196			pm_runtime_put_autosuspend(dev);
   197		}
   198	
   199		return ret;
   200	}
   201	

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