[PATCH 4.2.y-ckt 19/64] drm/amdgpu: fix amdgpu_bo_pin_restricted VRAM placing v2

[Kamal Mostafa]

4.2.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig at amd.com>

commit 78d0e182b6c1f5336f6e8cbb197f403276dabc7f upstream.

We could pin BOs into invisible VRAM otherwise.

v2: make logic more readable as suggested by Michel

Signed-off-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com> (v1)
Reviewed-by: Rex Zhu <Rex.Zhu at amd.com> (v1)
Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 8da6424..9ada34f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -407,7 +407,8 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
 		}
 		if (fpfn > bo->placements[i].fpfn)
 			bo->placements[i].fpfn = fpfn;
-		if (lpfn && lpfn < bo->placements[i].lpfn)
+		if (!bo->placements[i].lpfn ||
+		    (lpfn && lpfn < bo->placements[i].lpfn))
 			bo->placements[i].lpfn = lpfn;
 		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
 	}
-- 
1.9.1