linux-kernel - drivers/ptp/ptp_clockmatrix.c:107: undefined reference to `i2c

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Date:   Wed, 11 Dec 2019 19:49:23 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: drivers/ptp/ptp_clockmatrix.c:107: undefined reference to
 `i2c_transfer'

Hi Ingo,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6794862a16ef41f753abd75c03a152836e4c8028
commit: 0bcd7762727dd8ba9b9b6f828e5a4cbd5da4f725 x86/iopl: Make 'struct tss_struct' constant size again
date:   2 weeks ago
config: i386-randconfig-b001-20191211 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-1) 7.5.0
reproduce:
        git checkout 0bcd7762727dd8ba9b9b6f828e5a4cbd5da4f725
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   ld: drivers/ptp/ptp_clockmatrix.o: in function `idtcm_xfer':
>> drivers/ptp/ptp_clockmatrix.c:107: undefined reference to `i2c_transfer'
   ld: drivers/ptp/ptp_clockmatrix.o: in function `idtcm_driver_init':
>> drivers/ptp/ptp_clockmatrix.c:1427: undefined reference to `i2c_register_driver'
   ld: drivers/ptp/ptp_clockmatrix.o: in function `idtcm_driver_exit':
>> drivers/ptp/ptp_clockmatrix.c:1427: undefined reference to `i2c_del_driver'

vim +107 drivers/ptp/ptp_clockmatrix.c

3a6ba7dc779935 Vincent Cheng 2019-10-31   86  
3a6ba7dc779935 Vincent Cheng 2019-10-31   87  static int idtcm_xfer(struct idtcm *idtcm,
3a6ba7dc779935 Vincent Cheng 2019-10-31   88  		      u8 regaddr,
3a6ba7dc779935 Vincent Cheng 2019-10-31   89  		      u8 *buf,
3a6ba7dc779935 Vincent Cheng 2019-10-31   90  		      u16 count,
3a6ba7dc779935 Vincent Cheng 2019-10-31   91  		      bool write)
3a6ba7dc779935 Vincent Cheng 2019-10-31   92  {
3a6ba7dc779935 Vincent Cheng 2019-10-31   93  	struct i2c_client *client = idtcm->client;
3a6ba7dc779935 Vincent Cheng 2019-10-31   94  	struct i2c_msg msg[2];
3a6ba7dc779935 Vincent Cheng 2019-10-31   95  	int cnt;
3a6ba7dc779935 Vincent Cheng 2019-10-31   96  
3a6ba7dc779935 Vincent Cheng 2019-10-31   97  	msg[0].addr = client->addr;
3a6ba7dc779935 Vincent Cheng 2019-10-31   98  	msg[0].flags = 0;
3a6ba7dc779935 Vincent Cheng 2019-10-31   99  	msg[0].len = 1;
3a6ba7dc779935 Vincent Cheng 2019-10-31  100  	msg[0].buf = &regaddr;
3a6ba7dc779935 Vincent Cheng 2019-10-31  101  
3a6ba7dc779935 Vincent Cheng 2019-10-31  102  	msg[1].addr = client->addr;
3a6ba7dc779935 Vincent Cheng 2019-10-31  103  	msg[1].flags = write ? 0 : I2C_M_RD;
3a6ba7dc779935 Vincent Cheng 2019-10-31  104  	msg[1].len = count;
3a6ba7dc779935 Vincent Cheng 2019-10-31  105  	msg[1].buf = buf;
3a6ba7dc779935 Vincent Cheng 2019-10-31  106  
3a6ba7dc779935 Vincent Cheng 2019-10-31 @107  	cnt = i2c_transfer(client->adapter, msg, 2);
3a6ba7dc779935 Vincent Cheng 2019-10-31  108  
3a6ba7dc779935 Vincent Cheng 2019-10-31  109  	if (cnt < 0) {
3a6ba7dc779935 Vincent Cheng 2019-10-31  110  		dev_err(&client->dev, "i2c_transfer returned %d\n", cnt);
3a6ba7dc779935 Vincent Cheng 2019-10-31  111  		return cnt;
3a6ba7dc779935 Vincent Cheng 2019-10-31  112  	} else if (cnt != 2) {
3a6ba7dc779935 Vincent Cheng 2019-10-31  113  		dev_err(&client->dev,
3a6ba7dc779935 Vincent Cheng 2019-10-31  114  			"i2c_transfer sent only %d of %d messages\n", cnt, 2);
3a6ba7dc779935 Vincent Cheng 2019-10-31  115  		return -EIO;
3a6ba7dc779935 Vincent Cheng 2019-10-31  116  	}
3a6ba7dc779935 Vincent Cheng 2019-10-31  117  
3a6ba7dc779935 Vincent Cheng 2019-10-31  118  	return 0;
3a6ba7dc779935 Vincent Cheng 2019-10-31  119  }
3a6ba7dc779935 Vincent Cheng 2019-10-31  120  

:::::: The code at line 107 was first introduced by commit
:::::: 3a6ba7dc7799355557938fbdc15a558236011429 ptp: Add a ptp clock driver for IDT ClockMatrix.

:::::: TO: Vincent Cheng <vincent.cheng.xh@...esas.com>
:::::: CC: David S. Miller <davem@...emloft.net>

---
0-DAY kernel test infrastructure                 Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation

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