drm/ttm: change fence_lock to inner lock

This requires changing the order in ttm_bo_cleanup_refs_or_queue to
take the reservation first, as there is otherwise no race free way to
take lru lock before fence_lock.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 1986d006c264..cd9e4523dc56 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -213,8 +213,8 @@ void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
         driver = bdev->driver;
         glob = bo->glob;
 
-        spin_lock(&bdev->fence_lock);
         spin_lock(&glob->lru_lock);
+        spin_lock(&bdev->fence_lock);
 
         list_for_each_entry(entry, list, head) {
                 bo = entry->bo;
@@ -223,8 +223,8 @@ void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
                 ttm_bo_unreserve_locked(bo);
                 entry->reserved = false;
         }
-        spin_unlock(&glob->lru_lock);
         spin_unlock(&bdev->fence_lock);
+        spin_unlock(&glob->lru_lock);
 
         list_for_each_entry(entry, list, head) {
                 if (entry->old_sync_obj)