linux-kernel - drivers/gpu/drm/gud/gud_drv.c:95:28: sparse: sparse: cast to restricted _

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Date:   Sat, 11 Nov 2023 20:55:12 +0800
From:   kernel test robot <lkp@...el.com>
To:     Noralf Trønnes <noralf@...nnes.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Peter Stuge <peter@...ge.se>
Subject: drivers/gpu/drm/gud/gud_drv.c:95:28: sparse: sparse: cast to
 restricted __le32

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3ca112b71f35dd5d99fc4571a56b5fc6f0c15814
commit: 40e1a70b4aedf2859a1829991b48ef0ebe650bf2 drm: Add GUD USB Display driver
date:   2 years, 8 months ago
config: i386-randconfig-062-20230912 (https://download.01.org/0day-ci/archive/20231111/202311112013.3oeb6fZG-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231111/202311112013.3oeb6fZG-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311112013.3oeb6fZG-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/gud/gud_drv.c:95:28: sparse: sparse: cast to restricted __le32
>> drivers/gpu/drm/gud/gud_drv.c:95:17: sparse: sparse: restricted __le32 degrades to integer

vim +95 drivers/gpu/drm/gud/gud_drv.c

    76	
    77	static int gud_get_display_descriptor(struct usb_interface *intf,
    78					      struct gud_display_descriptor_req *desc)
    79	{
    80		void *buf;
    81		int ret;
    82	
    83		buf = kmalloc(sizeof(*desc), GFP_KERNEL);
    84		if (!buf)
    85			return -ENOMEM;
    86	
    87		ret = gud_usb_control_msg(intf, true, GUD_REQ_GET_DESCRIPTOR, 0, buf, sizeof(*desc));
    88		memcpy(desc, buf, sizeof(*desc));
    89		kfree(buf);
    90		if (ret < 0)
    91			return ret;
    92		if (ret != sizeof(*desc))
    93			return -EIO;
    94	
  > 95		if (desc->magic != le32_to_cpu(GUD_DISPLAY_MAGIC))
    96			return -ENODATA;
    97	
    98		DRM_DEV_DEBUG_DRIVER(&intf->dev,
    99				     "version=%u flags=0x%x compression=0x%x max_buffer_size=%u\n",
   100				     desc->version, le32_to_cpu(desc->flags), desc->compression,
   101				     le32_to_cpu(desc->max_buffer_size));
   102	
   103		if (!desc->version || !desc->max_width || !desc->max_height ||
   104		    le32_to_cpu(desc->min_width) > le32_to_cpu(desc->max_width) ||
   105		    le32_to_cpu(desc->min_height) > le32_to_cpu(desc->max_height))
   106			return -EINVAL;
   107	
   108		return 0;
   109	}
   110	

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