[Intel-gfx] [PATCH] drm/i915: Do not dereference NULL bo->resource

[Nirmoy Das]

bo->resource could be NULL hence add a NULL check for
bo->resource before dereferencing it.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/6850
Fixes: ad74457a6b5a96 ("drm/i915/dgfx: Release mmap on rpm suspend")
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..8608801cd9ab 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -513,7 +513,7 @@ static void i915_ttm_delete_mem_notify(struct ttm_buffer_object *bo)
 
 	if (likely(obj)) {
 		/* ttm_bo_release() already has dma_resv_lock */
-		if (i915_ttm_cpu_maps_iomem(bo->resource))
+		if (bo->resource && i915_ttm_cpu_maps_iomem(bo->resource))
 			wakeref = intel_runtime_pm_get(&to_i915(obj->base.dev)->runtime_pm);
 
 		__i915_gem_object_pages_fini(obj);
-- 
2.37.3