Re: [PATCH v2] USB: serial: xr: Add TIOCGRS485 and TIOCSRS485 ioctls

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

Hi Jarkko,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on johan-usb-serial/usb-next]
[also build test WARNING on johan-usb-serial/usb-linus linus/master v6.3-rc2 next-20230314]
[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/Jarkko-Sonninen/USB-serial-xr-Add-TIOCGRS485-and-TIOCSRS485-ioctls/20230313-163032
base:   https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git usb-next
patch link:    https://lore.kernel.org/r/20230313082734.886890-1-kasper%40iki.fi
patch subject: [PATCH v2] USB: serial: xr: Add TIOCGRS485 and TIOCSRS485 ioctls
config: sparc64-randconfig-s031-20230312 (https://download.01.org/0day-ci/archive/20230314/202303141402.sfS74rp6-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/3470fe1d77e0edf25fc417f516491abbd812dc41
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jarkko-Sonninen/USB-serial-xr-Add-TIOCGRS485-and-TIOCSRS485-ioctls/20230313-163032
        git checkout 3470fe1d77e0edf25fc417f516491abbd812dc41
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/usb/serial/ kernel/trace/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303141402.sfS74rp6-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/usb/serial/xr_serial.c:870:37: sparse: sparse: Using plain integer as NULL pointer

vim +870 drivers/usb/serial/xr_serial.c

   853	
   854	static int xr_set_rs485_config(struct tty_struct *tty,
   855				 unsigned long __user *argp)
   856	{
   857		struct usb_serial_port *port = tty->driver_data;
   858		struct xr_data *data = usb_get_serial_port_data(port);
   859		struct serial_rs485 rs485;
   860		unsigned long flags;
   861	
   862		if (copy_from_user(&rs485, argp, sizeof(rs485)))
   863			return -EFAULT;
   864	
   865		dev_dbg(tty->dev, "Flags %02x\n", rs485.flags);
   866		rs485.flags &= SER_RS485_ENABLED;
   867		spin_lock_irqsave(&data->lock, flags);
   868		memcpy(&data->rs485, &rs485, sizeof(rs485));
   869		spin_unlock_irqrestore(&data->lock, flags);
 > 870		xr_set_flow_mode(tty, port, 0);
   871	
   872		if (copy_to_user(argp, &data->rs485, sizeof(data->rs485)))
   873			return -EFAULT;
   874	
   875		return 0;
   876	}
   877	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests