--- planB/rpmsg_wwan_ctrl.c.orig	2026-09-26 15:40:27.272000000 +0600
+++ linux/drivers/net/wwan/rpmsg_wwan_ctrl.c	2026-09-26 15:40:27.300000000 +0600
@@ -37,6 +37,10 @@
 	};
 
 	strscpy(chinfo.name, rpwwan->rpdev->id.name, sizeof(chinfo.name));
+	/* The port can be opened before wwan_create_port() returns to probe,
+	 * so make sure the rx callback never sees a NULL wwan_port.
+	 */
+	rpwwan->wwan_port = port;
 	rpwwan->ept = rpmsg_create_ept(rpwwan->rpdev, rpmsg_wwan_ctrl_callback,
 				       rpwwan, chinfo);
 	if (!rpwwan->ept)