linux-kernel - Re: [PATCH -next] serial: etraxfs-uart: Fix crash

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Date:	Mon, 2 Nov 2015 08:37:55 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, Niklas Cassel <nks@...wful.org>
Subject: Re: [PATCH -next] serial: etraxfs-uart: Fix crash

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@...gutronix.de>
> Cc: Niklas Cassel <nks@...wful.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thanks
Uwe

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