Re: [PATCH v2] drm/ast: use managed devres functions

[kernel test robot]

Hi Philipp,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on drm/drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.7-rc1 next-20231116]
[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/Philipp-Stanner/drm-ast-use-managed-devres-functions/20231104-022841
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20231103182542.97589-2-pstanner%40redhat.com
patch subject: [PATCH v2] drm/ast: use managed devres functions
config: x86_64-randconfig-122-20231116 (https://download.01.org/0day-ci/archive/20231116/202311162100.DnPejGd3-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231116/202311162100.DnPejGd3-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311162100.DnPejGd3-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/ast/ast_main.c:447:48: sparse: sparse: Using plain integer as NULL pointer
   drivers/gpu/drm/ast/ast_main.c:466:56: sparse: sparse: Using plain integer as NULL pointer

vim +447 drivers/gpu/drm/ast/ast_main.c

   426	
   427	struct ast_device *ast_device_create(const struct drm_driver *drv,
   428					     struct pci_dev *pdev,
   429					     unsigned long flags)
   430	{
   431		struct drm_device *dev;
   432		struct ast_device *ast;
   433		bool need_post = false;
   434		int ret = 0;
   435	
   436		ast = devm_drm_dev_alloc(&pdev->dev, drv, struct ast_device, base);
   437		if (IS_ERR(ast))
   438			return ast;
   439		dev = &ast->base;
   440	
   441		pci_set_drvdata(pdev, dev);
   442	
   443		ret = drmm_mutex_init(dev, &ast->ioregs_lock);
   444		if (ret)
   445			return ERR_PTR(ret);
   446	
 > 447		ret = pcim_iomap_regions(pdev, BIT(1), 0);

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