linux-kernel - Re: [PATCH] ARM: timer-sp: ensure interrupt is cleared at sp804_clockevents

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Date:	Tue, 16 Sep 2014 18:09:23 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Chanho Min <chanho.min@....com>
Cc:	Russell King <linux@....linux.org.uk>,
	Michael Opdenacker <michael@...e-electrons.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: timer-sp: ensure interrupt is cleared at
 sp804_clockevents_init

On 09/17, Chanho Min wrote:
> When sp804 is registerd as clock event device, it may not be added to

s/registerd/registered/

> tick device if the higher rated device is already registerd. In this case,

s/registerd/registered/

> for uncertan reason, inetrrupt is occured without event_handler it cause

s/inetrrupt/interrupt/

> kernel panic. So Interrupt should be cleared before clockevent is registered.
> 
> Signed-off-by: Chanho Min <chanho.min@....com>
> ---
>  arch/arm/common/timer-sp.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
> index fd6bff0..b658873 100644
> --- a/arch/arm/common/timer-sp.c
> +++ b/arch/arm/common/timer-sp.c
> @@ -205,6 +205,8 @@ void __init __sp804_clockevents_init(void __iomem *base, unsigned int irq, struc
>  
>  	writel(0, base + TIMER_CTRL);
>  
> +	/* Ensure interrupt is cleared */
> +	writel(1, clkevt_base + TIMER_INTCLR);
>  	setup_irq(irq, &sp804_timer_irq);
>  	clockevents_config_and_register(evt, rate, 0xf, 0xffffffff);

Or just flip the order of clockevents_config_and_register() and
setup_irq()? We've done this in other clockevents drivers.

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