Hi Arun,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on linux/master v5.7-rc5 next-20200512]
[cannot apply to rpmsg/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Arun-Kumar-Neelakantam/Add-TIOCM-Signals-support-for-RPMSG-char-devices/20200513-134544
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 24085f70a6e1b0cb647ec92623284641d8270637
config: alpha-randconfig-r012-20200513 (attached as .config)
compiler: alpha-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=alpha 

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

All warnings (new ones prefixed by >>):

drivers/rpmsg/rpmsg_char.c: In function 'rpmsg_eptdev_ioctl':
>> drivers/rpmsg/rpmsg_char.c:322:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
322 |   ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL);
|         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/rpmsg/rpmsg_char.c:323:2: note: here
323 |  default:
|  ^~~~~~~

vim +322 drivers/rpmsg/rpmsg_char.c

   303	
   304	static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
   305				       unsigned long arg)
   306	{
   307		struct rpmsg_eptdev *eptdev = fp->private_data;
   308		int ret;
   309	
   310		switch (cmd) {
   311		case TIOCMGET:
   312			ret = rpmsg_get_signals(eptdev->ept);
   313			if (ret >= 0)
   314				ret = put_user(ret, (int __user *)arg);
   315			break;
   316		case TIOCMSET:
   317		case TIOCMBIS:
   318		case TIOCMBIC:
   319			ret = rpmsg_eptdev_tiocmset(fp, cmd, (int __user *)arg);
   320			break;
   321		case RPMSG_DESTROY_EPT_IOCTL:
 > 322			ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL);
   323		default:
   324			ret = -EINVAL;
   325		}
   326	
   327		return ret;
   328	}
   329	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org