wifi-scripts: don't swap handler config under a running setup script

A reload during an in-flight setup ran wdev_config_init() immediately,
replacing handler_config/handler_data while the script was still running, so
its set_data notifications resolved against the new (renumbered) interface
table and link up/down calls became asymmetric. Defer the re-init in
check() while a handler run is in progress and re-apply from the setup and
teardown callbacks once it completes.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/network/config/wifi-scripts/files/lib/netifd/wireless-device.uc

@@ -173,6 +173,9 @@ function wdev_teardown_cb(wdev)
 		return;
 	}
 
+	if (wdev.config_change)
+		wdev_config_init(wdev);
+
 	wdev.setup();
 }
 
@@ -443,6 +446,14 @@ function check()
 	if (!wdev_update_disabled_vifs(this))
 		return;
 
+	/*
+	 * Defer applying a new config while a handler run is in progress: the
+	 * running script keeps its start-time config, and the setup/teardown
+	 * callback re-applies once it finishes (config_change stays set).
+	 */
+	if (this.state != "up" && this.state != "down")
+		return;
+
 	wdev_config_init(this);
 	this.setup();
 }