interface: detect and handle changes in device config

[project/netifd.git] / wireless.c

diff --git a/wireless.c b/wireless.c
index 8bdfc4b10ec1b5b1b04afef78ca0eb8418c64a49..fbd6191617ab59937ed306f05cf64408c18eb024 100644 (file)
--- a/wireless.c
+++ b/wireless.c
@@ -240,8 +240,14 @@ wireless_device_run_handler(struct wireless_device *wdev, bool up)
        int fds[2] = { -1, -1 };
 
        D(WIRELESS, "Wireless device '%s' run %s handler\n", wdev->name, action);
-       prepare_config(wdev, &b, up);
-       config = blobmsg_format_json(b.head, true);
+       if (!up && wdev->prev_config) {
+               config = blobmsg_format_json(wdev->prev_config, true);
+               free(wdev->prev_config);
+               wdev->prev_config = NULL;
+       } else {
+               prepare_config(wdev, &b, up);
+               config = blobmsg_format_json(b.head, true);
+       }
 
        argv[i++] = wdev->drv->script;
        argv[i++] = wdev->drv->name;
@@ -273,6 +279,8 @@ __wireless_device_set_up(struct wireless_device *wdev)
        if (wdev->state != IFS_DOWN || config_init)
                return;
 
+       free(wdev->prev_config);
+       wdev->prev_config = NULL;
        wdev->state = IFS_SETUP;
        wireless_device_run_handler(wdev, true);
 }
@@ -283,6 +291,7 @@ wireless_device_free(struct wireless_device *wdev)
        vlist_flush_all(&wdev->interfaces);
        avl_delete(&wireless_devices.avl, &wdev->node.avl);
        free(wdev->config);
+       free(wdev->prev_config);
        free(wdev);
 }
 
@@ -421,6 +430,16 @@ wdev_set_config_state(struct wireless_device *wdev, enum interface_config_state
                __wireless_device_set_down(wdev);
 }
 
+static void
+wdev_prepare_prev_config(struct wireless_device *wdev)
+{
+       if (wdev->prev_config)
+               return;
+
+       prepare_config(wdev, &b, false);
+       wdev->prev_config = blob_memdup(b.head);
+}
+
 static void
 wdev_change_config(struct wireless_device *wdev, struct wireless_device *wd_new)
 {
@@ -429,6 +448,7 @@ wdev_change_config(struct wireless_device *wdev, struct wireless_device *wd_new)
 
        free(wd_new);
 
+       wdev_prepare_prev_config(wdev);
        if (blob_attr_equal(wdev->config, new_config) && wdev->disabled == disabled)
                return;