On Sun, Mar 26, 2017 at 3:54 AM, Julia Lawall <julia.lawall@xxxxxxx> wrote: > Is an unlock needed before line 848? Or does blkg_lookup_check take care > of it? Unlock is not needed. On success, function returns with locks held. It is documented at line 805: "... This function returns with RCU read * lock and queue lock held and must be paired with blkg_conf_finish()."