linux-kernel - Re: [PATCH v3] ARM: ep93xx: Replace setup_irq() by request

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Date:   Sun, 1 Mar 2020 17:21:51 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     afzal mohammed <afzal.mohd.ma@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v3] ARM: ep93xx: Replace setup_irq() by request_irq()

Hi Afzal, Arnd,

as there is no dedicated tree for EP93xx, could you please
consider the below patch for your arm-soc tree?

On 01/03/2020 13:21, afzal mohammed wrote:
> request_irq() is preferred over setup_irq(). Invocations of setup_irq()
> occur after memory allocators are ready.
> 
> Per tglx[1], setup_irq() existed in olden days when allocators were not
> ready by the time early interrupts were initialized.
> 
> Hence replace setup_irq() by request_irq().
> 
> [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos
> 
> Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>

Acked-by: Alexander Sverdlin <alexander.sverdlin@...il.com>

> ---
> Hi sub-arch maintainers,
> 
> If the patch is okay, please take it thr' your tree.
> 
> Regards
> afzal
> 
> v3:
>  * Split out from series, also create subarch level patch as Thomas
> 	suggested to take it thr' respective maintainers
>  * Modify string displayed in case of error as suggested by Thomas
>  * Re-arrange code as required to improve readability
>  * Remove irrelevant parts from commit message & improve
>  
> v2:
>  * Replace pr_err("request_irq() on %s failed" by
>            pr_err("%s: request_irq() failed"
>  * Commit message massage
> 
>  arch/arm/mach-ep93xx/timer-ep93xx.c | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm/mach-ep93xx/timer-ep93xx.c b/arch/arm/mach-ep93xx/timer-ep93xx.c
> index de998830f534..dd4b164d1831 100644
> --- a/arch/arm/mach-ep93xx/timer-ep93xx.c
> +++ b/arch/arm/mach-ep93xx/timer-ep93xx.c
> @@ -117,15 +117,11 @@ static irqreturn_t ep93xx_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction ep93xx_timer_irq = {
> -	.name		= "ep93xx timer",
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.handler	= ep93xx_timer_interrupt,
> -	.dev_id		= &ep93xx_clockevent,
> -};
> -
>  void __init ep93xx_timer_init(void)
>  {
> +	int irq = IRQ_EP93XX_TIMER3;
> +	unsigned long flags = IRQF_TIMER | IRQF_IRQPOLL;
> +
>  	/* Enable and register clocksource and sched_clock on timer 4 */
>  	writel(EP93XX_TIMER4_VALUE_HIGH_ENABLE,
>  	       EP93XX_TIMER4_VALUE_HIGH);
> @@ -136,7 +132,9 @@ void __init ep93xx_timer_init(void)
>  			     EP93XX_TIMER4_RATE);
>  
>  	/* Set up clockevent on timer 3 */
> -	setup_irq(IRQ_EP93XX_TIMER3, &ep93xx_timer_irq);
> +	if (request_irq(irq, ep93xx_timer_interrupt, flags, "ep93xx timer",
> +			&ep93xx_clockevent))
> +		pr_err("Failed to request irq %d (ep93xx timer)\n", irq);
>  	clockevents_config_and_register(&ep93xx_clockevent,
>  					EP93XX_TIMER123_RATE,
>  					1,
>