Re: [Intel-gfx] [PATCH] drm/i915: Fix race in __i915_vma_remove_closed

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

Hi Karol,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on linus/master v5.18-rc3 next-20220419]
[cannot apply to drm-intel/for-linux-next linux/master]
[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/intel-lab-lkp/linux/commits/Karol-Herbst/drm-i915-Fix-race-in-__i915_vma_remove_closed/20220420-074525
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: x86_64-randconfig-a011 (https://download.01.org/0day-ci/archive/20220420/202204201422.5Bu5aV2Z-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/50a17180127b7d2527ee9a8f5c9e8207e158afb6
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Karol-Herbst/drm-i915-Fix-race-in-__i915_vma_remove_closed/20220420-074525
        git checkout 50a17180127b7d2527ee9a8f5c9e8207e158afb6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/i915/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/i915/i915_vma.c: In function 'release_references':
>> drivers/gpu/drm/i915/i915_vma.c:1654:9: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
    1654 |         struct intel_gt *gt = vma->vm->gt;
         |         ^~~~~~


vim +1654 drivers/gpu/drm/i915/i915_vma.c

  1640	
  1641	static void release_references(struct i915_vma *vma, bool vm_ddestroy)
  1642	{
  1643		struct drm_i915_gem_object *obj = vma->obj;
  1644	
  1645		GEM_BUG_ON(i915_vma_is_active(vma));
  1646	
  1647		spin_lock(&obj->vma.lock);
  1648		list_del(&vma->obj_link);
  1649		if (!RB_EMPTY_NODE(&vma->obj_node))
  1650			rb_erase(&vma->obj_node, &obj->vma.tree);
  1651	
  1652		spin_unlock(&obj->vma.lock);
  1653	
> 1654		struct intel_gt *gt = vma->vm->gt;
  1655	
  1656		spin_lock_irq(&gt->closed_lock);
  1657		__i915_vma_remove_closed(vma);
  1658		spin_unlock_irq(&gt->closed_lock);
  1659	
  1660		if (vm_ddestroy)
  1661			i915_vm_resv_put(vma->vm);
  1662	
  1663		i915_active_fini(&vma->active);
  1664		GEM_WARN_ON(vma->resource);
  1665		i915_vma_free(vma);
  1666	}
  1667	

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