[freescale-fslc:pr/639 4361/24603] drivers/i2c/busses/xen-i2cfront.c:148:5: warning: no previous prototype for function 'i2cfront_xfer'

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

Hi Peng,

FYI, the error/warning still remains.

tree:   https://github.com/Freescale/linux-fslc pr/639
head:   857fbf7cebaba3b1ffccc558deee1d13ac0e11d7
commit: 278ca911463717ef3565b97b4e515c0269d6d22b [4361/24603] LF-191-2 i2c: introduce xen i2c paravirtualization driver
config: x86_64-randconfig-r016-20230831 (https://download.01.org/0day-ci/archive/20230831/202308312218.flSXKSw8-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230831/202308312218.flSXKSw8-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/202308312218.flSXKSw8-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/i2c/busses/xen-i2cfront.c:148:5: warning: no previous prototype for function 'i2cfront_xfer' [-Wmissing-prototypes]
   int i2cfront_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
       ^
   drivers/i2c/busses/xen-i2cfront.c:148:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int i2cfront_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
   ^
   static 
   1 warning generated.


vim +/i2cfront_xfer +148 drivers/i2c/busses/xen-i2cfront.c

   147	
 > 148	int i2cfront_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
   149	{
   150		struct i2cfront_info *info = i2c_get_adapdata(adapter);
   151		int ret, i;
   152	
   153		if (!info || !info->i2cdev) {
   154			dev_err(&adapter->dev, "Not initialized\n");
   155			return -EIO;
   156		}
   157	
   158		if (info->i2cdev->state != XenbusStateConnected) {
   159			dev_err(&adapter->dev, "Not connected\n");
   160			return -EIO;
   161		}
   162	
   163		for (i = 0; i < num; i++) {
   164			if (msgs[i].flags & I2C_M_RD) {
   165				ret = i2cfront_do_req(adapter, &msgs[i], 1);
   166			} else if ((i + 1 < num) && (msgs[i + 1].flags & I2C_M_RD) &&
   167				(msgs[i].addr == msgs[i + 1].addr)) {
   168				ret = i2cfront_do_req(adapter, &msgs[i], 2);
   169				i++;
   170			} else {
   171				ret = i2cfront_do_req(adapter, &msgs[i], 1);
   172			}
   173	
   174			if (ret < 0)
   175				goto err;
   176		}
   177	err:
   178		return (ret < 0) ? ret : num;
   179	}
   180	

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