From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751229AbcCDKvQ (ORCPT ); Fri, 4 Mar 2016 05:51:16 -0500 Received: from mail-pa0-f49.google.com ([209.85.220.49]:35222 "EHLO mail-pa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750832AbcCDKvN (ORCPT ); Fri, 4 Mar 2016 05:51:13 -0500 From: Sudip Mukherjee To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, Sudip Mukherjee , Subject: [PATCH] parport: register driver later Date: Fri, 4 Mar 2016 16:20:59 +0530 Message-Id: <1457088659-12321-1-git-send-email-sudipm.mukherjee@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If the parport bus is not yet registered and any device using parallel port tries to register with the bus we get a stackdump with a message of Kernel bug. Reported-by: Fengguang Wu Tested-by: Ross Zwisler Cc: # 4.2+ Signed-off-by: Sudip Mukherjee --- We should actually have some deferred probe here. But considering that you will be closing your trees soon so a quick fix to solve the problem for now. We will revisit this when we remove the old api (hopefully v4.7). drivers/parport/share.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/parport/share.c b/drivers/parport/share.c index 3308427..176b2b6 100644 --- a/drivers/parport/share.c +++ b/drivers/parport/share.c @@ -273,6 +273,9 @@ int __parport_register_driver(struct parport_driver *drv, struct module *owner, /* using device model */ int ret; + if (!parport_bus_type.p) + return -EAGAIN; + /* initialize common driver fields */ drv->driver.name = drv->name; drv->driver.bus = &parport_bus_type; -- 1.9.1