Re: [PATCH v2 1/2] x86: Add basic support for the Congatec CGEB BIOS interface

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

Hi Mary,

kernel test robot noticed the following build errors:

[auto build test ERROR on lee-mfd/for-mfd-next]
[also build test ERROR on lee-mfd/for-mfd-fixes andi-shyti/i2c/i2c-host akpm-mm/mm-everything linus/master v6.11-rc1 next-20240802]
[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/Mary-Strodl/x86-Add-basic-support-for-the-Congatec-CGEB-BIOS-interface/20240803-013725
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
patch link:    https://lore.kernel.org/r/20240801160610.101859-2-mstrodl%40csh.rit.edu
patch subject: [PATCH v2 1/2] x86: Add basic support for the Congatec CGEB BIOS interface
config: x86_64-randconfig-002-20240804 (https://download.01.org/0day-ci/archive/20240804/202408040528.OmB08hFQ-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240804/202408040528.OmB08hFQ-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/202408040528.OmB08hFQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/mfd/congatec-cgeb.o: in function `cgeb_request':
>> drivers/mfd/congatec-cgeb.c:303: undefined reference to `cn_netlink_send'
>> ld: drivers/mfd/congatec-cgeb.c:312: undefined reference to `cn_netlink_send'
   ld: drivers/mfd/congatec-cgeb.o: in function `cgeb_exit':
>> drivers/mfd/congatec-cgeb.c:1131: undefined reference to `cn_del_callback'
   ld: drivers/mfd/congatec-cgeb.o: in function `cgeb_init':
>> drivers/mfd/congatec-cgeb.c:1054: undefined reference to `cn_add_callback'
>> ld: drivers/mfd/congatec-cgeb.c:1113: undefined reference to `cn_del_callback'


vim +303 drivers/mfd/congatec-cgeb.c

   266	
   267	static int cgeb_request(struct cgeb_msg msg, struct cgeb_msg *out,
   268				int (*callback)(struct cgeb_msg*, void*), void *user)
   269	{
   270		static int seq;
   271		struct cn_msg *wrapper;
   272		struct cgeb_request *req;
   273		int err, retries = 0;
   274	
   275		wrapper = (struct cn_msg*) kzalloc(sizeof(*wrapper) + sizeof(msg),
   276						   GFP_KERNEL);
   277		if (!wrapper)
   278			return -ENOMEM;
   279	
   280		memset(wrapper, 0, sizeof(*wrapper));
   281		memcpy(&wrapper->id, &cgeb_cn_id, sizeof(cgeb_cn_id));
   282	
   283		wrapper->len = sizeof(msg);
   284		wrapper->ack = get_random_u32();
   285		memcpy(wrapper + 1, &msg, sizeof(msg));
   286	
   287		mutex_lock(&cgeb_lock);
   288	
   289		req = &cgeb_requests[seq];
   290	
   291		if (req->busy) {
   292			mutex_unlock(&cgeb_lock);
   293			err = -EBUSY;
   294			goto out;
   295		}
   296		wrapper->seq = seq;
   297		req->busy = CGEB_REQ_ACTIVE;
   298		req->ack = wrapper->ack;
   299		req->out = out;
   300		req->callback = callback;
   301		req->user = user;
   302	
 > 303		err = cn_netlink_send(wrapper, 0, 0, GFP_KERNEL);
   304		if (err == -ESRCH) {
   305			err = cgeb_helper_start();
   306			if (err) {
   307				pr_err("failed to execute %s\n", cgeb_helper_path);
   308				pr_err("make sure that the cgeb helper is installed and"
   309				       " executable\n");
   310			} else {
   311				do {
 > 312					err = cn_netlink_send(wrapper, 0, 0,
   313							      GFP_KERNEL);
   314					if (err == -ENOBUFS)
   315						err = 0;
   316					if (err == -ESRCH)
   317						msleep(30);
   318				} while (err == -ESRCH && ++retries < 5);
   319			}
   320		} else if (err == -ENOBUFS)
   321			err = 0;
   322	
   323		kfree(wrapper);
   324	
   325		if (++seq >= CGEB_REQUEST_MAX)
   326			seq = 0;
   327	
   328		mutex_unlock(&cgeb_lock);
   329	
   330		if (err)
   331			goto out;
   332	
   333		/* Wait for a response to the request */
   334		err = wait_for_completion_interruptible_timeout(
   335			&req->done, msecs_to_jiffies(20000));
   336		if (err == 0) {
   337			pr_err("CGEB: Timed out running request of type %d!\n",
   338			       msg.type);
   339			err = -ETIMEDOUT;
   340		} else if (err > 0)
   341			err = 0;
   342	
   343		if (err)
   344			goto out;
   345	
   346		mutex_lock(&cgeb_lock);
   347	
   348		if (req->busy != CGEB_REQ_DONE) {
   349			pr_err("CGEB: BUG: Request is in a bad state?\n");
   350			err = -EINVAL;
   351		}
   352	
   353		req->busy = CGEB_REQ_IDLE;
   354		mutex_unlock(&cgeb_lock);
   355	out:
   356		return err;
   357	}
   358	

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