Subject: Re: [PATCH -next] serial: etraxfs-uart: Fix crash
To: Niklas Cassel <nks@flawful.org>,
        =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <u.kleine-koenig@pengutronix.de>
References: <1446431576-4385-1-git-send-email-linux@roeck-us.net>
 <20151102073755.GN4931@pengutronix.de> <5637D1F5.2090608@flawful.org>
 <20151102212933.GB4931@pengutronix.de> <56491B2F.30300@flawful.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>, linux-serial@vger.kernel.org,
        linux-kernel@vger.kernel.org
From: Guenter Roeck <linux@roeck-us.net>
Message-ID: <56492680.5040208@roeck-us.net>
Date: Sun, 15 Nov 2015 16:42:40 -0800
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On 11/15/2015 03:54 PM, Niklas Cassel wrote:
> I think that Guenter's patch should be merged asap.
> Right now the bug it fixes stops us from boot testing in qemu.
>

I'll send out a build (failure) report after -rc1 is out.
Maybe that will create enough visibility to get the patch accepted
(or officially Nacked).

Guenter

> For the broken mctrl irq handling part, when Uwe
> has converted mxs-auart to use the generic irq init,
> I can do the same for etraxfs + make sure that it gets tested
> properly on real hardware.
>
> On 11/02/2015 10:29 PM, Uwe Kleine-König wrote:
>> Helo Niklas,
>>
>> On Mon, Nov 02, 2015 at 10:13:25PM +0100, Niklas Cassel wrote:
>>> On 11/02/2015 08:37 AM, Uwe Kleine-König wrote:
>>>>> 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.
>>> The only drivers including serial_mctrl_gpio.h is atmel_serial.c,
>>> clps711x.c, mxs-auart.c and etraxfs-uart.c
>>>
>>> etraxfs commit
>>> 7b9c5162c182 ("serial: etraxfs-uart: use mctrl_gpio helpers for handling modem signals")
>>> is heavily influenced by
>>> 62b0a1b3e759 ("serial: clps711x: Use mctrl_gpio helpers for handling modem signals")
>>>
>>> a driver which also appears to lack mctrl irq setup/handling.
>>>
>>>
>>> Uwe, are you going to convert all serial drivers that includes serial_mctrl_gpio.h to
>>> use the new mctrl_gpio_init? (which also sets up irqs)
>> That is the plan. For drivers like mxs-auart (that do irq handling) this
>> is just simplification. When the irq handling is missing converting to
>> the new mctrl_gpio_init might introduce regressions because it does
>> request_irq which might fail.
>>
>>> Since mctrl gpios are optional in the device tree, I guess mctrl_gpio_init handles if
>>> they are missing. So even if etraxfs-uart.c currently lacks mctrl irq setup/handling,
>>> if we migrate it to use the new mctrl_gpio_init, we will get this automatically?
>> Right, if there are no gpios specified (new and old) mctrl_gpio is a
>> nop.
>>
>> Best regards
>> Uwe
>>
>
>

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