Re: [PATCH v2] Input: elants_i2c - Fix NULL dereference at probing

Hi Takashi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on input/next]
[also build test WARNING on hid/for-next linux/master linus/master v5.13-rc3 next-20210527]
[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]

url:    https://github.com/0day-ci/linux/commits/Takashi-Iwai/Input-elants_i2c-Fix-NULL-dereference-at-probing/20210528-013428
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: x86_64-randconfig-s021-20210527 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/8a6af622a33ab5301cea789e5ff6a9afd9b09828
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Takashi-Iwai/Input-elants_i2c-Fix-NULL-dereference-at-probing/20210528-013428
        git checkout 8a6af622a33ab5301cea789e5ff6a9afd9b09828
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>


sparse warnings: (new ones prefixed by >>)

quoted

drivers/input/touchscreen/elants_i2c.c:1639:50: sparse: sparse: Using plain integer as NULL pointer
drivers/input/touchscreen/elants_i2c.c:1640:50: sparse: sparse: incorrect type in initializer (different base types) @@     expected void const *data @@     got int @@

   drivers/input/touchscreen/elants_i2c.c:1640:50: sparse:     expected void const *data
   drivers/input/touchscreen/elants_i2c.c:1640:50: sparse:     got int

vim +1639 drivers/input/touchscreen/elants_i2c.c

  1636	
  1637	#ifdef CONFIG_OF
  1638	static const struct of_device_id elants_of_match[] = {

1639		{ .compatible = "elan,ekth3500", .data = EKTH3500 },
1640		{ .compatible = "elan,ektf3624", .data = EKTF3624 },

  1641		{ /* sentinel */ }
  1642	};
  1643	MODULE_DEVICE_TABLE(of, elants_of_match);
  1644	#endif
  1645	

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