drm/amdgpu: fix userptr lockup

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index b3a17a9ab1f4..b1969f2b2038 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -142,6 +142,9 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
 
                 list_for_each_entry(bo, &node->bos, mn_list) {
 
+                        if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
+                                continue;
+
                         r = amdgpu_bo_reserve(bo, true);
                         if (r) {
                                 DRM_ERROR("(%ld) failed to reserve user bo\n", r);