[PATCH 1/4] drm/radeon: fix lockup when BOs aren't part of the VM on release

[Christian König]

From: Christian König <christian.koenig at amd.com>

If we unmap BOs before releasing them them the intervall tree locks
up because we try to remove an entry not inside the tree.

Signed-off-by: Christian König <christian.koenig at amd.com>
CC: stable at vger.kernel.org
---
 drivers/gpu/drm/radeon/radeon_vm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index 2a5a4a9..16d8e95 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -1107,7 +1107,8 @@ void radeon_vm_bo_rmv(struct radeon_device *rdev,
 	list_del(&bo_va->bo_list);
 
 	mutex_lock(&vm->mutex);
-	interval_tree_remove(&bo_va->it, &vm->va);
+	if (bo_va->it.start || bo_va->it.last)
+		interval_tree_remove(&bo_va->it, &vm->va);
 	spin_lock(&vm->status_lock);
 	list_del(&bo_va->vm_status);
 
-- 
1.9.1