linux-kernel - [PATCH 4.4 176/342] drm/amdgpu: fix amdgpu_bo_pin

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Message-Id: <20160301234533.642218600@linuxfoundation.org>
Date:	Tue, 01 Mar 2016 23:54:48 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>,
	Christian König <christian.koenig@....com>,
	Michel Dänzer <michel.daenzer@....com>
Subject: [PATCH 4.4 176/342] drm/amdgpu: fix amdgpu_bo_pin_restricted VRAM placing v2

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

------------------

From: Christian König <christian.koenig@....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@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com> (v1)
Reviewed-by: Rex Zhu <Rex.Zhu@....com> (v1)
Reviewed-by: Michel Dänzer <michel.daenzer@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -399,7 +399,8 @@ int amdgpu_bo_pin_restricted(struct amdg
 		}
 		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;
 	}