Re: [PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller

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

Hi Svyatoslav,

kernel test robot noticed the following build warnings:

[auto build test WARNING on sre-power-supply/for-next]
[also build test WARNING on robh/for-next linus/master v7.0-rc2 next-20260305]
[cannot apply to dtor-input/next dtor-input/for-linus]
[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/Svyatoslav-Ryhel/dt-bindings-embedded-controller-document-ASUS-Transformer-EC/20260305-030907
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next
patch link:    https://lore.kernel.org/r/20260304185751.83494-3-clamor95%40gmail.com
patch subject: [PATCH v5 2/7] mfd: Add driver for ASUS Transformer embedded controller
config: powerpc64-randconfig-r133-20260305 (https://download.01.org/0day-ci/archive/20260307/202603070848.ib570eG8-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9a109fbb6e184ec9bcce10615949f598f4c974a9)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603070848.ib570eG8-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603070848.ib570eG8-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mfd/asus-transformer-ec.c:482:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const * @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     expected void const *
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     got char const [noderef] __user *buf
>> drivers/mfd/asus-transformer-ec.c:482:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const * @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     expected void const *
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     got char const [noderef] __user *buf
   drivers/mfd/asus-transformer-ec.c:482:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const * @@     got char const [noderef] __user *buf @@
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     expected void const *
   drivers/mfd/asus-transformer-ec.c:482:9: sparse:     got char const [noderef] __user *buf
   drivers/mfd/asus-transformer-ec.c:476:16: sparse: sparse: dereference of noderef expression

vim +482 drivers/mfd/asus-transformer-ec.c

   467	
   468	static int dockram_write_one(struct i2c_client *client, int reg,
   469				     const char __user *buf, size_t count)
   470	{
   471		struct dockram_ec_data *priv = i2c_get_clientdata(client);
   472		int ret;
   473	
   474		if (!count || count > DOCKRAM_ENTRY_SIZE)
   475			return -EINVAL;
   476		if (buf[0] != count - 1)
   477			return -EINVAL;
   478	
   479		guard(mutex)(&priv->ctl_lock);
   480	
   481		priv->ctl_data[0] = (u8)count;
 > 482		memcpy(priv->ctl_data + 1, buf, count);
   483		ret = asus_dockram_write(client, reg, priv->ctl_data);
   484	
   485		return ret;
   486	}
   487	

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