diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index bf2a5f3..8a43bc8 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -818,7 +818,9 @@
 			 * queued (again) by ceph_update_snap_trace()
 			 * below.  Queue it _now_, under the old context.
 			 */
+			spin_lock(&realm->inodes_with_caps_lock);
 			list_del_init(&ci->i_snap_realm_item);
+			spin_unlock(&realm->inodes_with_caps_lock);
 			spin_unlock(&inode->i_lock);
 
 			ceph_queue_cap_snap(ci,