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-rw-r--r--drivers/gpu/drm/ttm/ttm_bo.c54
1 files changed, 23 insertions, 31 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index da3702135ada..8036b6e189ee 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -524,52 +524,44 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
{
struct ttm_bo_global *glob = bdev->glob;
- struct ttm_buffer_object *entry, *nentry;
- struct list_head *list, *next;
- int ret;
+ struct ttm_buffer_object *entry = NULL;
+ int ret = 0;
spin_lock(&glob->lru_lock);
- list_for_each_safe(list, next, &bdev->ddestroy) {
- entry = list_entry(list, struct ttm_buffer_object, ddestroy);
- nentry = NULL;
+ if (list_empty(&bdev->ddestroy))
+ goto out_unlock;
- /*
- * Protect the next list entry from destruction while we
- * unlock the lru_lock.
- */
+ entry = list_first_entry(&bdev->ddestroy,
+ struct ttm_buffer_object, ddestroy);
+ kref_get(&entry->list_kref);
+
+ for (;;) {
+ struct ttm_buffer_object *nentry = NULL;
- if (next != &bdev->ddestroy) {
- nentry = list_entry(next, struct ttm_buffer_object,
- ddestroy);
+ if (entry->ddestroy.next != &bdev->ddestroy) {
+ nentry = list_first_entry(&entry->ddestroy,
+ struct ttm_buffer_object, ddestroy);
kref_get(&nentry->list_kref);
}
- kref_get(&entry->list_kref);
spin_unlock(&glob->lru_lock);
ret = ttm_bo_cleanup_refs(entry, remove_all);
kref_put(&entry->list_kref, ttm_bo_release_list);
+ entry = nentry;
+
+ if (ret || !entry)
+ goto out;
spin_lock(&glob->lru_lock);
- if (nentry) {
- bool next_onlist = !list_empty(next);
- spin_unlock(&glob->lru_lock);
- kref_put(&nentry->list_kref, ttm_bo_release_list);
- spin_lock(&glob->lru_lock);
- /*
- * Someone might have raced us and removed the
- * next entry from the list. We don't bother restarting
- * list traversal.
- */
-
- if (!next_onlist)
- break;
- }
- if (ret)
+ if (list_empty(&entry->ddestroy))
break;
}
- ret = !list_empty(&bdev->ddestroy);
- spin_unlock(&glob->lru_lock);
+out_unlock:
+ spin_unlock(&glob->lru_lock);
+out:
+ if (entry)
+ kref_put(&entry->list_kref, ttm_bo_release_list);
return ret;
}