Re: [RESEND PATCH V4 3/4] rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support

[kbuild test robot]

Hi Arun,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.4-rc8 next-20191122]
[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/rpmsg-core-Add-signal-API-support/20191124-174653
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6b8a794678763130b7e7d049985008641dc494e8
config: riscv-defconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 7.4.0
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
        GCC_VERSION=7.4.0 make.cross ARCH=riscv 

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

All warnings (new ones prefixed by >>):

   drivers/rpmsg/rpmsg_char.c: In function 'rpmsg_eptdev_ioctl':
>> drivers/rpmsg/rpmsg_char.c:324:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
      ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL);
      ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/rpmsg/rpmsg_char.c:325:2: note: here
     default:
     ^~~~~~~

vim +324 drivers/rpmsg/rpmsg_char.c

   305	
   306	static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
   307				       unsigned long arg)
   308	{
   309		struct rpmsg_eptdev *eptdev = fp->private_data;
   310		int ret;
   311	
   312		switch (cmd) {
   313		case TIOCMGET:
   314			ret = rpmsg_get_signals(eptdev->ept);
   315			if (ret >= 0)
   316				ret = put_user(ret, (int __user *)arg);
   317			break;
   318		case TIOCMSET:
   319		case TIOCMBIS:
   320		case TIOCMBIC:
   321			ret = rpmsg_eptdev_tiocmset(fp, cmd, (int __user *)arg);
   322			break;
   323		case RPMSG_DESTROY_EPT_IOCTL:
 > 324			ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL);
   325		default:
   326			ret = -EINVAL;
   327		}
   328	
   329		return ret;
   330	}
   331	

---
0-DAY kernel test infrastructure                 Open Source Technology Center
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