ms: Get rid of ms->delay field

Simply apply the content of the configured timer when the MS goes idle.
Having that field is convenient to do tricky stuff in unit tests, but
makes the main osmo-pcu app more complex for no good enough reason.

Change-Id: I8d44318b37b6605afd84db8ccec0d75e6db293b9

3 files changed, 8 insertions, 19 deletions

diff --git a/src/bts.cpp b/src/bts.cpp
index 4cbe68e8..d4bb35fa 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -241,11 +241,8 @@ static const struct osmo_stat_item_group_desc bts_statg_desc = {
 static int bts_talloc_destructor(struct gprs_rlcmac_bts* bts)
 {
 	struct GprsMs *ms;
-	while ((ms = llist_first_entry_or_null(&bts->ms_list, struct GprsMs, list))) {
-		ms_set_timeout(ms, 0);
-		bts_stat_item_dec(bts, STAT_MS_PRESENT);
+	while ((ms = llist_first_entry_or_null(&bts->ms_list, struct GprsMs, list)))
 		talloc_free(ms);
-	}
 
 	gprs_bssgp_destroy(bts);
 
diff --git a/src/gprs_ms.c b/src/gprs_ms.c
index 877422ff..1450d190 100644
--- a/src/gprs_ms.c
+++ b/src/gprs_ms.c
@@ -170,8 +170,6 @@ struct GprsMs *ms_alloc(struct gprs_rlcmac_bts *bts, const char *use_ref)
 	if (!ms->ctrs)
 		goto free_ret;
 
-	ms_set_timeout(ms, osmo_tdef_get(bts->pcu->T_defs, -2030, OSMO_TDEF_S, -1));
-
 	if (use_ref)
 		ms_ref(ms, use_ref);
 	return ms;
@@ -219,6 +217,8 @@ static int ms_talloc_destructor(struct GprsMs *ms)
 /* MS has no attached TBFs anymore. */
 static void ms_becomes_idle(struct GprsMs *ms)
 {
+	unsigned long delay_rel_sec = osmo_tdef_get(ms->bts->pcu->T_defs, -2030, OSMO_TDEF_S, -1);
+
 	ms_set_reserved_slots(ms, NULL, 0, 0);
 	ms->first_common_ts = NULL;
 
@@ -226,7 +226,7 @@ static void ms_becomes_idle(struct GprsMs *ms)
 	 * Skip delaying free() through release timer if delay is configured to be 0.
 	 * This is useful for synced freed during unit tests.
 	 */
-	if (ms->delay == 0) {
+	if (delay_rel_sec == 0) {
 		talloc_free(ms);
 		return;
 	}
@@ -240,8 +240,8 @@ static void ms_becomes_idle(struct GprsMs *ms)
 		return;
 	}
 
-	LOGPMS(ms, DMS, LOGL_INFO, "Schedule MS release in %u secs\n", ms->delay);
-	osmo_timer_schedule(&ms->timer, ms->delay, 0);
+	LOGPMS(ms, DMS, LOGL_INFO, "Schedule MS release in %lu secs\n", delay_rel_sec);
+	osmo_timer_schedule(&ms->timer, delay_rel_sec, 0);
 }
 
 static void ms_becomes_active(struct GprsMs *ms)
@@ -398,9 +398,6 @@ void ms_reset(struct GprsMs *ms)
 	struct llist_item *pos;
 	struct gprs_rlcmac_tbf *tbf;
 
-	/* free immediately when it becomes idle: */
-	ms->delay = 0;
-
 	tbf = ul_tbf_as_tbf(ms_ul_tbf(ms));
 	if (tbf && !tbf_timers_pending(tbf, T_MAX))
 		tbf_free(tbf);
@@ -415,7 +412,8 @@ void ms_reset(struct GprsMs *ms)
 	}
 
 	/* Flag it with invalid data so that it cannot be looked up anymore and
-	* shows up specially if listed in VTY: */
+	* shows up specially if listed in VTY. Furthermore, it will also trigger
+	* immediate free() when it becomes idle: */
 	ms->tlli = GSM_RESERVED_TMSI;
 	ms->new_dl_tlli = ms->tlli;
 	ms->new_ul_tlli = ms->tlli;
diff --git a/src/gprs_ms.h b/src/gprs_ms.h
index 03508ffc..4f6456e7 100644
--- a/src/gprs_ms.h
+++ b/src/gprs_ms.h
@@ -80,7 +80,6 @@ struct GprsMs {
 
 	struct osmo_use_count use_count;
 	struct osmo_timer_list timer;
-	unsigned delay;
 
 	int64_t last_cs_not_low;
 
@@ -216,11 +215,6 @@ static inline enum mcs_kind ms_mode(const struct GprsMs *ms)
 	return ms->mode;
 }
 
-static inline void ms_set_timeout(struct GprsMs *ms, unsigned secs)
-{
-	ms->delay = secs;
-}
-
 static inline unsigned ms_nack_rate_dl(const struct GprsMs *ms)
 {
 	return ms->nack_rate_dl;