[PATCH] drm/i915: Do not cleanup obj with NULL bo->resource

[Nirmoy Das]

For delayed BO release i915_ttm_delete_mem_notify()
gets called twice, once with proper bo->resource and
another time with NULL. We shouldn't do anything for
the 2nd time as we already cleanedup the obj once.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/6850
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 0544b0a4a43a..e3fc38dd5db0 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -511,7 +511,7 @@ static void i915_ttm_delete_mem_notify(struct ttm_buffer_object *bo)
 	struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
 	intel_wakeref_t wakeref = 0;
 
-	if (likely(obj)) {
+	if (bo->resource && likely(obj)) {
 		/* ttm_bo_release() already has dma_resv_lock */
 		if (i915_ttm_cpu_maps_iomem(bo->resource))
 			wakeref = intel_runtime_pm_get(&to_i915(obj->base.dev)->runtime_pm);
-- 
2.37.3