linux-kernel - Re: [PATCH v3 10/15] serial: stm32-usart: Add STM32 USART Driver

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Date:	Thu, 26 Mar 2015 15:46:18 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	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,
	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>,
	Daniel Lezcano <daniel.lezcano@...aro.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>,
	Joe Perches <joe@...ches.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 v3  10/15] serial: stm32-usart: Add STM32 USART Driver

On Tue, Mar 24, 2015 at 02:23:38PM -0400, Peter Hurley wrote:
> Hi Maxime,
> 
> On 03/12/2015 05:55 PM, Maxime Coquelin wrote:
> > +static unsigned int stm32_get_mctrl(struct uart_port *port)
> > +{
> > +	/*
> > +	 * This routine is used for geting signals of: DTR, DCD, DSR, RI,
> > +	 * and CTS/RTS

It's also worth noting that this comment is wrong.  This is used to get
the state of DCD, DSR, RI and CTS.  DTR and RTS are *not* included
because the core tracks their state.

...

> > +	stm32port->clk = devm_clk_get(&pdev->dev, NULL);
> > +
> > +	if (WARN_ON(IS_ERR(stm32port->clk)))
> 
> Do you really need a stack trace here? Could this be dev_err() instead?
> 
> > +		return -EINVAL;

Also, propagate the error code.

> > +
> > +	/* ensure that clk rate is correct by enabling the clk */
> > +	clk_prepare_enable(stm32port->clk);

And remember to check the return value of clk_prepare_enable().

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