WPS: Convert struct advertisement_state_machine to use struct dl_list

src/wps/wps_upnp.c

@@ -907,6 +907,15 @@ fail:
 }
 
 
+static void upnp_wps_free_msearchreply(struct dl_list *head)
+{
+	struct advertisement_state_machine *a, *tmp;
+	dl_list_for_each_safe(a, tmp, head, struct advertisement_state_machine,
+			      list)
+		msearchreply_state_machine_stop(a);
+}
+
+
 static void upnp_wps_free_subscriptions(struct dl_list *head)
 {
 	struct subscription *s, *tmp;
@@ -928,8 +937,7 @@ void upnp_wps_device_stop(struct upnp_wps_device_sm *sm)
 
 	wpa_printf(MSG_DEBUG, "WPS UPnP: Stop device");
 	web_listener_stop(sm);
-	while (sm->msearch_replies)
-		msearchreply_state_machine_stop(sm->msearch_replies);
+	upnp_wps_free_msearchreply(&sm->msearch_replies);
 	upnp_wps_free_subscriptions(&sm->subscriptions);
 
 	advertisement_state_machine_stop(sm, 1);
@@ -1058,6 +1066,7 @@ upnp_wps_device_init(struct upnp_wps_device_ctx *ctx, struct wps_context *wps,
 	sm->ctx = ctx;
 	sm->wps = wps;
 	sm->priv = priv;
+	dl_list_init(&sm->msearch_replies);
 	dl_list_init(&sm->subscriptions);
 
 	return sm;

src/wps/wps_upnp_i.h

@@ -31,7 +31,6 @@
 #define MULTICAST_MAX_READ 1600 /* max bytes we'll read for UPD request */
 
 
-struct subscription;
 struct upnp_wps_device_sm;
 struct wps_registrar;
 
@@ -50,9 +49,7 @@ enum advertisement_type_enum {
  * separate packets and spread out in time to avoid congestion.
  */
 struct advertisement_state_machine {
-	/* double-linked list */
-	struct advertisement_state_machine *next;
-	struct advertisement_state_machine *prev;
+	struct dl_list list;
 	struct upnp_wps_device_sm *sm; /* parent */
 	enum advertisement_type_enum type;
 	int state;
@@ -127,8 +124,7 @@ struct upnp_wps_device_sm {
 	int ssdp_sd_registered; /* nonzero if we must unregister */
 	unsigned advertise_count; /* how many advertisements done */
 	struct advertisement_state_machine advertisement;
-	struct advertisement_state_machine *msearch_replies;
-	int n_msearch_replies; /* no. of pending M-SEARCH replies */
+	struct dl_list msearch_replies;
 	int web_port; /* our port that others get xml files from */
 	struct http_server *web_srv;
 	/* Note: subscriptions are kept in expiry order */

src/wps/wps_upnp_ssdp.c

@@ -385,18 +385,9 @@ static void msearchreply_state_machine_handler(void *eloop_data,
  */
 void msearchreply_state_machine_stop(struct advertisement_state_machine *a)
 {
-	struct upnp_wps_device_sm *sm = a->sm;
 	wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH stop");
-	if (a->next == a) {
-		sm->msearch_replies = NULL;
-	} else {
-		if (sm->msearch_replies == a)
-			sm->msearch_replies = a->next;
-		a->next->prev = a->prev;
-		a->prev->next = a->next;
-	}
+	dl_list_del(&a->list);
 	os_free(a);
-	sm->n_msearch_replies--;
 }
 
 
@@ -476,10 +467,12 @@ static void msearchreply_state_machine_start(struct upnp_wps_device_sm *sm,
 	struct advertisement_state_machine *a;
 	int next_timeout_sec;
 	int next_timeout_msec;
+	int replies;
 
+	replies = dl_list_len(&sm->msearch_replies);
 	wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply start (%d "
-		   "outstanding)", sm->n_msearch_replies);
-	if (sm->n_msearch_replies >= MAX_MSEARCH) {
+		   "outstanding)", replies);
+	if (replies >= MAX_MSEARCH) {
 		wpa_printf(MSG_INFO, "WPS UPnP: Too many outstanding "
 			   "M-SEARCH replies");
 		return;
@@ -503,15 +496,7 @@ static void msearchreply_state_machine_start(struct upnp_wps_device_sm *sm,
 		goto fail;
 	}
 	/* Remember for future cleanup */
-	if (sm->msearch_replies) {
-		a->next = sm->msearch_replies;
-		a->prev = a->next->prev;
-		a->prev->next = a;
-		a->next->prev = a;
-	} else {
-		sm->msearch_replies = a->next = a->prev = a;
-	}
-	sm->n_msearch_replies++;
+	dl_list_add(&sm->msearch_replies, &a->list);
 	return;
 
 fail: