From nobody Sun Feb 8 07:07:25 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E30F8C77B7A for ; Thu, 1 Jun 2023 14:15:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234204AbjFAOPJ (ORCPT ); Thu, 1 Jun 2023 10:15:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234107AbjFAOPB (ORCPT ); Thu, 1 Jun 2023 10:15:01 -0400 Received: from muru.com (muru.com [72.249.23.125]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 90E058E; Thu, 1 Jun 2023 07:15:00 -0700 (PDT) Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 0386F80F1; Thu, 1 Jun 2023 14:14:57 +0000 (UTC) From: Tony Lindgren To: Greg Kroah-Hartman , Jiri Slaby , Andy Shevchenko Cc: Andy Shevchenko , Dhruva Gole , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , John Ogness , Johan Hovold , Sebastian Andrzej Siewior , Vignesh Raghavendra , linux-omap@vger.kernel.org, Marek Szyprowski , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] serial: core: Fix probing serial_base_bus devices Date: Thu, 1 Jun 2023 17:14:44 +0300 Message-Id: <20230601141445.11321-1-tony@atomide.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If a physical serial port device driver uses arch_initcall() we fail to probe the serial_base_bus devices and the serial port tx fails. This is because as serial_base_bus uses module_initcall(). Let's fix the issue by changing serial_base_bus to use arch_initcall(). Let's also return an error if a driver attempts to call uart_add_one_port() too early. Reported-by: Marek Szyprowski Closes: https://lore.kernel.org/linux-serial/20230601132012.GB14287@atomide= .com/T/#m6a40440fc04d551d27b147da8602e065c982a115 Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to en= able runtime PM") Signed-off-by: Tony Lindgren --- drivers/tty/serial/serial_base_bus.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/serial_base_bus.c b/drivers/tty/serial/seri= al_base_bus.c --- a/drivers/tty/serial/serial_base_bus.c +++ b/drivers/tty/serial/serial_base_bus.c @@ -17,6 +17,8 @@ =20 #include "serial_base.h" =20 +static bool serial_base_initialized; + static int serial_base_match(struct device *dev, struct device_driver *drv) { int len =3D strlen(drv->name); @@ -48,6 +50,11 @@ static int serial_base_device_init(struct uart_port *por= t, void (*release)(struct device *dev), int id) { + if (!serial_base_initialized) { + dev_err(port->dev, "uart_add_one_port() called before arch_initcall()?\n= "); + return -EPROBE_DEFER; + } + device_initialize(dev); dev->type =3D type; dev->parent =3D parent_dev; @@ -175,6 +182,8 @@ static int serial_base_init(void) if (ret) goto err_ctrl_exit; =20 + serial_base_initialized =3D true; + return 0; =20 err_ctrl_exit: @@ -185,7 +194,7 @@ static int serial_base_init(void) =20 return ret; } -module_init(serial_base_init); +arch_initcall(serial_base_init); =20 static void serial_base_exit(void) { --=20 2.40.1