Hi Sujeev,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc2 next-20180426]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Sujeev-Dias/mhi_bus-core-Add-support-for-MHI-host-interface/20180428-065959
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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
        make.cross ARCH=sparc64 

All error/warnings (new ones prefixed by >>):

   drivers/bus/mhi/core/mhi_dtr.c: In function 'mhi_ioctl':
>> drivers/bus/mhi/core/mhi_dtr.c:108:9: error: implicit declaration of function 'get_user'; did you mean 'get_super'? [-Werror=implicit-function-declaration]
      ret = get_user(tiocm, (u32 *)arg);
            ^~~~~~~~
            get_super
>> drivers/bus/mhi/core/mhi_dtr.c:108:7: warning: 'tiocm' may be used uninitialized in this function [-Wmaybe-uninitialized]
      ret = get_user(tiocm, (u32 *)arg);
      ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +108 drivers/bus/mhi/core/mhi_dtr.c

    90	
    91	long mhi_ioctl(struct mhi_device *mhi_dev, unsigned int cmd, unsigned long arg)
    92	{
    93		struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
    94		struct mhi_chan *mhi_chan = mhi_dev->ul_chan;
    95		int ret;
    96	
    97		/* ioctl not supported by this controller */
    98		if (!mhi_cntrl->dtr_dev)
    99			return -EIO;
   100	
   101		switch (cmd) {
   102		case TIOCMGET:
   103			return mhi_chan->tiocm;
   104		case TIOCMSET:
   105		{
   106			u32 tiocm;
   107	
 > 108			ret = get_user(tiocm, (u32 *)arg);
   109			if (ret)
   110				return ret;
   111	
   112			return mhi_dtr_tiocmset(mhi_cntrl, mhi_chan, tiocm);
   113		}
   114		default:
   115			break;
   116		}
   117	
   118		return -EINVAL;
   119	}
   120	EXPORT_SYMBOL(mhi_ioctl);
   121	

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