From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751385AbbKBHiG (ORCPT <rfc822;w@1wt.eu>);
	Mon, 2 Nov 2015 02:38:06 -0500
Received: from metis.ext.4.pengutronix.de ([92.198.50.35]:47167 "EHLO
	metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750873AbbKBHiD (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 2 Nov 2015 02:38:03 -0500
Date: Mon, 2 Nov 2015 08:37:55 +0100
From: Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= 
	<u.kleine-koenig@pengutronix.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>, linux-serial@vger.kernel.org,
        linux-kernel@vger.kernel.org, Niklas Cassel <nks@flawful.org>
Subject: Re: [PATCH -next] serial: etraxfs-uart: Fix crash
Message-ID: <20151102073755.GN4931@pengutronix.de>
References: <1446431576-4385-1-git-send-email-linux@roeck-us.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <1446431576-4385-1-git-send-email-linux@roeck-us.net>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c0
X-SA-Exim-Mail-From: ukl@pengutronix.de
X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false
X-PTX-Original-Recipient: linux-kernel@vger.kernel.org
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hello,

On Sun, Nov 01, 2015 at 06:32:56PM -0800, Guenter Roeck wrote:
> Since commit 7d8c70d8048c ("serial: mctrl-gpio: rename init function"),
> crisv32 either do not build or crash as follows.
> 
> Unable to handle kernel NULL pointer dereference
> Linux 4.3.0-rc7-next-20151101 #1 Sun Nov 1 11:41:28 PST 2015
> ...
> Call Trace: [<c0004a0e>] show_stack+0x0/0x9e
> [<c004c0c0>] printk+0x0/0x2c
> [<c00059d4>] show_registers+0x14a/0x1c2
> [<c004c0c0>] printk+0x0/0x2c
> [<c0004b52>] die_if_kernel+0x7c/0x9e
> [<c0005346>] do_page_fault+0x32e/0x3e6
> [<c01dc59c>] of_get_property+0x0/0x2c
> [<c01e0558>] of_irq_parse_raw+0x12a/0x376
> [<c01dc59c>] of_get_property+0x0/0x2c
> [<c0053aca>] get_page_from_freelist+0x73e/0x856
> [<c01dc59c>] of_get_property+0x0/0x2c
> [<c0008912>] d_mmu_refill+0x10a/0x112
> [<c01b488c>] devm_kmalloc+0x40/0x56
> [<c01b47d0>] add_dr+0xc/0x1c
> [<c01b4800>] devm_add_action+0x2/0x4e
> [<c01abdbc>] mctrl_gpio_init_noauto+0x1c/0x76
> [<c01abf9e>] mctrl_gpio_init+0x22/0x110

There should be a warning at compile time about mismatching parameters.

> The function call in the etraxfs-uart driver was not renamed,
> possibly due to interference with commit 7b9c5162c182 ("serial:
> etraxfs-uart: use mctrl_gpio helpers for handling modem signals").

Yes. BTW, 7b9c5162c182 looks broken, too, because the interrupt handling
is missing.

> Fixes: 7d8c70d8048c ("serial: mctrl-gpio: rename init function")
> Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Cc: Niklas Cassel <nks@flawful.org>
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |