[PATCH 3.18 013/195] drm/radeon: reset BOs address after clearing it.

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From: Christian König <christian.koenig@xxxxxxx>

[ Upstream commit 48afbd70ac7b6aa62e8d452091023941d8085f8a ]

Otherwise it is possible that we will have page table corruption
if we change a BOs address multiple times.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 drivers/gpu/drm/radeon/radeon_vm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index b0c4958..190eb5be 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -513,6 +513,8 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 			tmp->addr = bo_va->addr;
 			tmp->bo = radeon_bo_ref(bo_va->bo);
 			list_add(&tmp->vm_status, &vm->freed);
+
+			bo_va->addr = 0;
 		}
 
 		interval_tree_remove(&bo_va->it, &vm->va);
-- 
2.1.0

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