linux-kernel - Re: [PATCH v6 10/15] serial: stm32-usart: Add STM32 USART Driver

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Date:	Thu, 9 Apr 2015 16:04:39 +0300
From:	Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
To:	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	<u.kleine-koenig@...gutronix.de>, <afaerber@...e.de>,
	<geert@...ux-m68k.org>, Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, <stefan@...er.ch>,
	<pmeerw@...erw.net>, <pebolle@...cali.nl>,
	<peter@...leysoftware.com>, <andy.shevchenko@...il.com>,
	<cw00.choi@...sung.com>, Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>, <joe@...ches.com>
CC:	Jonathan Corbet <corbet@....net>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Antti Palosaari <crope@....fi>, Tejun Heo <tj@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Kees Cook <keescook@...omium.org>,
	Michal Marek <mmarek@...e.cz>, <linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-gpio@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <linux-api@...r.kernel.org>
Subject: Re: [PATCH v6 10/15] serial: stm32-usart: Add STM32 USART Driver

Hi Maxime,

On 07.04.2015 19:30, Maxime Coquelin wrote:
> This drivers adds support to the STM32 USART controller, which is a
> standard serial driver.
> 
> Tested-by: Chanwoo Choi <cw00.choi@...sung.com>
> Reviewed-by: Peter Hurley <peter@...leysoftware.com>
> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.com>
> ---
>  drivers/tty/serial/Kconfig       |  17 +
>  drivers/tty/serial/Makefile      |   1 +
>  drivers/tty/serial/stm32-usart.c | 735 +++++++++++++++++++++++++++++++++++++++
>  include/uapi/linux/serial_core.h |   3 +
>  4 files changed, 756 insertions(+)
>  create mode 100644 drivers/tty/serial/stm32-usart.c

[snip]

> +static void stm32_console_write(struct console *co, const char *s, unsigned cnt)
> +{
> +	struct uart_port *port = &stm32_ports[co->index].port;
> +	unsigned long flags;
> +	u32 old_cr1, new_cr1;
> +	int locked = 1;
> +
> +	if (oops_in_progress) {
> +		locked = spin_trylock_irqsave(&port->lock, flags);
> +	} else {
> +		locked = 1;

locked = 1 is done from the declaration.

Also do you want to add "if (port->sysrq) locked = 0;" check?

> +		spin_lock_irqsave(&port->lock, flags);
> +	}
> +

[snip]

Everything else is fine from point of view.

Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>

--
With best wishes,
Vladimir
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