iface-modem,bearer-list: sync all bearers one after the other

Do not launch N checks for N bearers and ignore their result. Instead,
go one by one, and report errors one by one.

src/mm-bearer-list.c

@@ -261,6 +261,92 @@ mm_bearer_list_disconnect_all_bearers (MMBearerList *self,
 
 /*****************************************************************************/
 
+#if defined WITH_SYSTEMD_SUSPEND_RESUME
+
+typedef struct {
+    GList        *pending;
+    MMBaseBearer *current;
+} SyncAllContext;
+
+static void
+sync_all_context_free (SyncAllContext *ctx)
+{
+    if (ctx->current)
+        g_object_unref (ctx->current);
+    g_list_free_full (ctx->pending, g_object_unref);
+    g_free (ctx);
+}
+
+gboolean
+mm_bearer_list_sync_all_bearers_finish (MMBearerList  *self,
+                                        GAsyncResult  *res,
+                                        GError       **error)
+{
+    return g_task_propagate_boolean (G_TASK (res), error);
+}
+
+static void sync_next_bearer (GTask *task);
+
+static void
+sync_ready (MMBaseBearer *bearer,
+            GAsyncResult *res,
+            GTask        *task)
+{
+    g_autoptr(GError) error = NULL;
+
+    if (!mm_base_bearer_sync_finish (bearer, res, &error))
+        mm_obj_warn (bearer, "failed synchronizing state: %s", error->message);
+
+    sync_next_bearer (task);
+}
+
+static void
+sync_next_bearer (GTask *task)
+{
+    SyncAllContext *ctx;
+
+    ctx = g_task_get_task_data (task);
+    if (ctx->current)
+        g_clear_object (&ctx->current);
+
+    /* No more bearers? all done! */
+    if (!ctx->pending) {
+        g_task_return_boolean (task, TRUE);
+        g_object_unref (task);
+        return;
+    }
+
+    ctx->current = MM_BASE_BEARER (ctx->pending->data);
+    ctx->pending = g_list_delete_link (ctx->pending, ctx->pending);
+
+    mm_base_bearer_sync (ctx->current, (GAsyncReadyCallback)sync_ready, task);
+}
+
+void
+mm_bearer_list_sync_all_bearers (MMBearerList        *self,
+                                 GAsyncReadyCallback  callback,
+                                 gpointer             user_data)
+{
+    SyncAllContext *ctx;
+    GTask          *task;
+
+    ctx = g_new0 (SyncAllContext, 1);
+
+    /* Get a copy of the list */
+    ctx->pending = g_list_copy_deep (self->priv->bearers,
+                                     (GCopyFunc)g_object_ref,
+                                     NULL);
+
+    task = g_task_new (self, NULL, callback, user_data);
+    g_task_set_task_data (task, ctx, (GDestroyNotify)sync_all_context_free);
+
+    sync_next_bearer (task);
+}
+
+#endif
+
+/*****************************************************************************/
+
 MMBearerList *
 mm_bearer_list_new (guint max_active_bearers,
                     guint max_active_multiplexed_bearers)

src/mm-bearer-list.h

@@ -84,4 +84,15 @@ gboolean mm_bearer_list_disconnect_all_bearers_finish (MMBearerList *self,
                                                        GAsyncResult *res,
                                                        GError **error);
 
+#if defined WITH_SYSTEMD_SUSPEND_RESUME
+
+void     mm_bearer_list_sync_all_bearers        (MMBearerList *self,
+                                                 GAsyncReadyCallback callback,
+                                                 gpointer user_data);
+gboolean mm_bearer_list_sync_all_bearers_finish (MMBearerList *self,
+                                                 GAsyncResult *res,
+                                                 GError **error);
+
+#endif
+
 #endif /* MM_BEARER_LIST_H */

src/mm-iface-modem.c

@@ -4272,19 +4272,49 @@ sync_detect_sim_swap_ready (MMIfaceModem *self,
 }
 
 static void
-reload_bearers (MMIfaceModem *self)
+sync_all_bearers_ready (MMBearerList *bearer_list,
+                        GAsyncResult *res,
+                        GTask        *task)
 {
-    g_autoptr(MMBearerList) list = NULL;
+    MMIfaceModem       *self;
+    SyncingContext     *ctx;
+    g_autoptr (GError)  error = NULL;
+
+    self = g_task_get_source_object (task);
+    ctx  = g_task_get_task_data (task);
+
+    if (!mm_bearer_list_sync_all_bearers_finish (bearer_list, res, &error))
+        mm_obj_warn (self, "synchronizing all bearer status failed: %s", error->message);
+
+    /* Go on to next step */
+    ctx->step++;
+    interface_syncing_step (task);
+}
+
+static void
+reload_bearers (GTask *task)
+{
+    MMIfaceModem            *self;
+    SyncingContext          *ctx;
+    g_autoptr(MMBearerList)  bearer_list = NULL;
+
+    self = g_task_get_source_object (task);
+    ctx  = g_task_get_task_data (task);
 
     g_object_get (self,
-                  MM_IFACE_MODEM_BEARER_LIST, &list,
+                  MM_IFACE_MODEM_BEARER_LIST, &bearer_list,
                   NULL);
 
-    if (list) {
-        mm_bearer_list_foreach (list,
-                               (MMBearerListForeachFunc)mm_base_bearer_sync,
-                                NULL);
+    if (!bearer_list) {
+        /* Go on to next step */
+        ctx->step++;
+        interface_syncing_step (task);
+        return;
     }
+
+    mm_bearer_list_sync_all_bearers (bearer_list,
+                                     (GAsyncReadyCallback)sync_all_bearers_ready,
+                                     task);
 }
 
 static void
@@ -4337,9 +4367,8 @@ interface_syncing_step (GTask *task)
         /*
          * Refresh bearers.
          */
-        reload_bearers (self);
-        ctx->step++;
-        /* fall through */
+        reload_bearers (task);
+        return;
 
     case SYNCING_STEP_LAST:
         /* We are done without errors! */