From: wentalou Date: Tue, 16 Apr 2019 07:09:16 +0000 (+0800) Subject: drm/amdgpu: amdgpu_device_recover_vram got NULL of shadow->parent X-Git-Tag: v5.4-rc1~971^2~9^2~38 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=36e499b2490a470a9a1e8d40096b4e397efac056;p=platform%2Fkernel%2Flinux-rpi.git drm/amdgpu: amdgpu_device_recover_vram got NULL of shadow->parent amdgpu_bo_destroy had a bug by calling amdgpu_bo_unref outside mutex_lock. If amdgpu_device_recover_vram executed between amdgpu_bo_unref and list_del_init, it would get NULL of shadow->parent, then caused Call Trace and GPU reset failed. Signed-off-by: Wentao Lou Reviewed-by: Christian König Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index ec9e45004bff..93b2c5a48a71 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -88,12 +88,14 @@ static void amdgpu_bo_destroy(struct ttm_buffer_object *tbo) if (bo->gem_base.import_attach) drm_prime_gem_destroy(&bo->gem_base, bo->tbo.sg); drm_gem_object_release(&bo->gem_base); - amdgpu_bo_unref(&bo->parent); + /* in case amdgpu_device_recover_vram got NULL of bo->parent */ if (!list_empty(&bo->shadow_list)) { mutex_lock(&adev->shadow_list_lock); list_del_init(&bo->shadow_list); mutex_unlock(&adev->shadow_list_lock); } + amdgpu_bo_unref(&bo->parent); + kfree(bo->metadata); kfree(bo); }