iface-modem,sim: make SIM interface initialization cancellable

src/mm-iface-modem.c

@@ -4470,7 +4470,7 @@ interface_initialization_step (InitializationContext *ctx)
              * This will try to load any missing property value that couldn't be
              * retrieved before due to having the SIM locked. */
             mm_sim_initialize (sim,
-                               NULL, /* TODO: cancellable */
+                               ctx->cancellable,
                                (GAsyncReadyCallback)sim_reinit_ready,
                                ctx);
             g_object_unref (sim);

src/mm-sim.c

@@ -1468,6 +1468,16 @@ STR_REPLY_READY_FN (operator_name, "Operator name")
 static void
 interface_initialization_step (InitAsyncContext *ctx)
 {
+    if (g_cancellable_is_cancelled (ctx->cancellable)) {
+        g_simple_async_result_set_error (ctx->result,
+                                         MM_CORE_ERROR,
+                                         MM_CORE_ERROR_CANCELLED,
+                                         "Interface initialization cancelled");
+        g_simple_async_result_complete_in_idle (ctx->result);
+        init_async_context_free (ctx);
+        return;
+    }
+
     switch (ctx->step) {
     case INITIALIZATION_STEP_FIRST:
         /* Fall down to next step */