Re: [v3 11/13] iio: imu: add BNO055 serdev driver

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

Hi Andrea,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on jic23-iio/togreg]
[also build test ERROR on linux/master linus/master v5.17-rc4 next-20220217]
[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]

url:    https://github.com/0day-ci/linux/commits/Andrea-Merello/Add-support-for-Bosch-BNO055-IMU/20220218-002932
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220218/202202181307.Lb4f99qg-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/98d7db4486f0404718da9e85ae13da54d757104b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Andrea-Merello/Add-support-for-Bosch-BNO055-IMU/20220218-002932
        git checkout 98d7db4486f0404718da9e85ae13da54d757104b
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   drivers/iio/imu/bno055/bno055.c:285:5: warning: no previous prototype for 'bno055_calibration_load' [-Wmissing-prototypes]
     285 | int bno055_calibration_load(struct bno055_priv *priv, const u8 *data, int len)
         |     ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/iio/imu/bno055/bno055.c:748:5: warning: no previous prototype for 'bno055_sysfs_attr_avail' [-Wmissing-prototypes]
     748 | int bno055_sysfs_attr_avail(struct bno055_priv *priv, struct bno055_sysfs_attr *attr,
         |     ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/iio/imu/bno055/bno055.c:1203:5: warning: no previous prototype for 'bno055_debugfs_reg_access' [-Wmissing-prototypes]
    1203 | int bno055_debugfs_reg_access(struct iio_dev *iio_dev, unsigned int reg,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/iio/imu/bno055/bno055.c: In function 'bno055_show_fw_version':
>> drivers/iio/imu/bno055/bno055.c:1235:2: error: implicit declaration of function 'kfree'; did you mean 'vfree'? [-Werror=implicit-function-declaration]
    1235 |  kfree(buf);
         |  ^~~~~
         |  vfree
   cc1: some warnings being treated as errors


vim +1235 drivers/iio/imu/bno055/bno055.c

16cbcd24402827b Andrea Merello 2022-02-17  1213  
16cbcd24402827b Andrea Merello 2022-02-17  1214  static ssize_t bno055_show_fw_version(struct file *file, char __user *userbuf,
16cbcd24402827b Andrea Merello 2022-02-17  1215  				      size_t count, loff_t *ppos)
16cbcd24402827b Andrea Merello 2022-02-17  1216  {
16cbcd24402827b Andrea Merello 2022-02-17  1217  	struct bno055_priv *priv = file->private_data;
16cbcd24402827b Andrea Merello 2022-02-17  1218  	int rev, ver;
16cbcd24402827b Andrea Merello 2022-02-17  1219  	char *buf;
16cbcd24402827b Andrea Merello 2022-02-17  1220  	int ret;
16cbcd24402827b Andrea Merello 2022-02-17  1221  
16cbcd24402827b Andrea Merello 2022-02-17  1222  	ret = regmap_read(priv->regmap, BNO055_SW_REV_LSB_REG, &rev);
16cbcd24402827b Andrea Merello 2022-02-17  1223  	if (ret)
16cbcd24402827b Andrea Merello 2022-02-17  1224  		return ret;
16cbcd24402827b Andrea Merello 2022-02-17  1225  
16cbcd24402827b Andrea Merello 2022-02-17  1226  	ret = regmap_read(priv->regmap, BNO055_SW_REV_MSB_REG, &ver);
16cbcd24402827b Andrea Merello 2022-02-17  1227  	if (ret)
16cbcd24402827b Andrea Merello 2022-02-17  1228  		return ret;
16cbcd24402827b Andrea Merello 2022-02-17  1229  
16cbcd24402827b Andrea Merello 2022-02-17  1230  	buf = kasprintf(GFP_KERNEL, "ver: 0x%x, rev: 0x%x\n", ver, rev);
16cbcd24402827b Andrea Merello 2022-02-17  1231  	if (!buf)
16cbcd24402827b Andrea Merello 2022-02-17  1232  		return -ENOMEM;
16cbcd24402827b Andrea Merello 2022-02-17  1233  
16cbcd24402827b Andrea Merello 2022-02-17  1234  	ret = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
16cbcd24402827b Andrea Merello 2022-02-17 @1235  	kfree(buf);
16cbcd24402827b Andrea Merello 2022-02-17  1236  
16cbcd24402827b Andrea Merello 2022-02-17  1237  	return ret;
16cbcd24402827b Andrea Merello 2022-02-17  1238  }
16cbcd24402827b Andrea Merello 2022-02-17  1239  

---
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