--- fwsync/driver/fwsync_mod.c	2022/07/11 21:18:07	1.4
+++ fwsync/driver/fwsync_mod.c	2022/08/04 00:24:39	1.5
@@ -25,6 +25,7 @@ struct cfg_sync fws_cfg;
 
 struct task fws_sndpkt_task;
 struct taskqueue *fws_tq;
+struct callout fws_co;
 struct mtx fws_mtx_c, fws_mtx_e;
 fwsync_sndpkt_t fwsync_sndpkt; 
 
@@ -60,6 +61,8 @@ fws_fini(void *arg)
 	}
 	mtx_unlock(&fws_mtx_c);
 
+	callout_drain(&fws_co);
+
 	mtx_destroy(&fws_mtx_c);
 	mtx_destroy(&fws_mtx_e);
 
@@ -110,6 +113,10 @@ fws_init(void *arg)
 		return ENOMEM;
 	} else
 		taskqueue_start_threads(&fws_tq, 1, PI_NET, "fwsync tq");
+
+	/* callout */
+
+	callout_init_mtx(&fws_co, &fws_mtx_e, 0);
 
 	/* sysctl context */
 	sysctl_ctx_init(&fwsync_sysctl_ctx);