drm/amdgpu: ignore changes of buffer function status because of GPU resets

When we reset the GPU we also disable/enable the SDMA, but we don't want
to change TTM idea of the VRAM size in the middle of that.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Chunming zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1540,7 +1540,7 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
 	struct ttm_mem_type_manager *man = &adev->mman.bdev.man[TTM_PL_VRAM];
 	uint64_t size;
 
-	if (!adev->mman.initialized)
+	if (!adev->mman.initialized || adev->in_gpu_reset)
 		return;
 
 	/* this just adjusts TTM size idea, which sets lpfn to the correct value */