linux-kernel - Re: [PATCHv2 4/4] clocksource: tcb_clksrc: unprepare clock in case of failure

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Message-ID: <20140903121015.2f756e4d@bbrezillon>
Date:	Wed, 3 Sep 2014 12:10:15 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Gaël PORTAY <g.portay@...rkiz.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pwm@...r.kernel.org, Nicolas Ferre <nicolas.ferre@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Subject: Re: [PATCHv2 4/4] clocksource: tcb_clksrc: unprepare clock in case
 of failure

On Fri, 29 Aug 2014 18:16:43 +0200
Gaël PORTAY <g.portay@...rkiz.com> wrote:

> The clock is not unprepared in case of the request IRQ fails.
> 
> Also update to request_irq.

As you're doing 2 different things in this commit (first move to
request_irq and then disable the TC clk if the request fails) I would
have chosen another commit title, like
"clocksource: tcb_clksrc: sanitize IRQ request"

Otherwise, you have my

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> 
> Signed-off-by: Gaël PORTAY <g.portay@...rkiz.com>
> ---
>  drivers/clocksource/tcb_clksrc.c | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
> index f922e81..8bdbc45 100644
> --- a/drivers/clocksource/tcb_clksrc.c
> +++ b/drivers/clocksource/tcb_clksrc.c
> @@ -178,12 +178,6 @@ static irqreturn_t ch2_irq(int irq, void *handle)
>  	return IRQ_NONE;
>  }
>  
> -static struct irqaction tc_irqaction = {
> -	.name		= "tc_clkevt",
> -	.flags		= IRQF_TIMER,
> -	.handler	= ch2_irq,
> -};
> -
>  static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
>  {
>  	int ret;
> @@ -198,15 +192,16 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
>  
>  	clkevt.regs = tc->regs;
>  	clkevt.clk = t2_clk;
> -	tc_irqaction.dev_id = &clkevt;
>  
>  	timer_clock = clk32k_divisor_idx;
>  
>  	clkevt.clkevt.cpumask = cpumask_of(0);
>  
> -	ret = setup_irq(irq, &tc_irqaction);
> -	if (ret)
> +	ret = request_irq(irq, ch2_irq, IRQF_TIMER, "tc_clkevt", &clkevt);
> +	if (ret) {
> +		clk_disable_unprepare(t2_clk);
>  		return ret;
> +	}
>  
>  	clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
>  



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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