[PATCH 3/4] FIXME: drm/xe/xe_drm_client: Add per drm client pagefault info

[kernel test robot]

Hi Jonathan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-xe/drm-xe-next]
[also build test WARNING on drm-exynos/exynos-drm-next linus/master v6.14-rc2 next-20250214]
[cannot apply to drm/drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip]
[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/Jonathan-Cavitt/drm-xe-xe_exec_queue-Add-ID-param-to-exec-queue-struct/20250215-043933
base:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
patch link:    https://lore.kernel.org/r/20250214203757.27895-4-jonathan.cavitt%40intel.com
patch subject: [PATCH 3/4] FIXME: drm/xe/xe_drm_client: Add per drm client pagefault info
config: alpha-randconfig-r051-20250216 (https://download.01.org/0day-ci/archive/20250216/202502161130.qHItt8dh-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 14.2.0

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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502161130.qHItt8dh-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/xe/xe_gt_pagefault.c:342:3-8: WARNING: NULL check before some freeing functions is not needed.

vim +342 drivers/gpu/drm/xe/xe_gt_pagefault.c

   332	
   333	static void save_pagefault_to_engine(struct xe_gt *gt, struct pagefault *pf)
   334	{
   335		struct xe_hw_engine *hwe;
   336	
   337		hwe = xe_gt_hw_engine(gt, pf->engine_class, pf->engine_instance, false);
   338		if (hwe) {
   339			spin_lock(&hwe->pf.lock);
   340			/** The latest pagefault is pf, so remove old pf info from engine */
   341			if (hwe->pf.info)
 > 342				kfree(hwe->pf.info);
   343			hwe->pf.info = kzalloc(sizeof(struct pagefault), GFP_KERNEL);
   344			if (hwe->pf.info)
   345				memcpy(hwe->pf.info, pf, sizeof(struct pagefault));
   346			spin_unlock(&hwe->pf.lock);
   347		}
   348	}
   349	

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