[PATCH 11/12] [TEST] use ttm pin for stolen object lifetime

[Robert Beckett]

see if this fixes the free with lock held.
if not, revert to page pinning, but ttm_bo_put before returing error if
page pinning fails.

Signed-off-by: Robert Beckett <bob.beckett at collabora.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index e5c20e5d5e62..84c87b054c17 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -998,6 +998,13 @@ static void i915_ttm_delayed_free(struct drm_i915_gem_object *obj)
 {
 	GEM_BUG_ON(!obj->ttm.created);
 
+	/* stolen objects are pinned for lifetime. Unpin before putting */
+	if (i915_gem_object_is_stolen(obj)) {
+		ttm_bo_reserve(i915_gem_to_ttm(obj), true, false, NULL);
+		ttm_bo_unpin(i915_gem_to_ttm(obj));
+		ttm_bo_unreserve(i915_gem_to_ttm(obj));
+	}
+
 	ttm_bo_put(i915_gem_to_ttm(obj));
 }
 
@@ -1243,11 +1250,8 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	i915_ttm_adjust_domains_after_move(obj);
 	i915_ttm_adjust_gem_after_move(obj);
 	obj->ttm.cache_level_override = false;
-	if (is_stolen) {
-		ret = i915_gem_object_pin_pages(obj);
-		if (ret)
-			return ret;
-	}
+	if (is_stolen)
+		ttm_bo_pin(i915_gem_to_ttm(obj));
 	i915_gem_object_unlock(obj);
 
 	return 0;
-- 
2.25.1