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

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Message-ID: <20151102212933.GB4931@pengutronix.de>
Date:	Mon, 2 Nov 2015 22:29:33 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Niklas Cassel <nks@...wful.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] serial: etraxfs-uart: Fix crash

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

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