linux-kernel - Re: [PATCH 1/3] irqchip: atmel-aic5: fix bug with mask/unmask

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Date:	Tue, 22 Sep 2015 09:45:43 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Ludovic Desroches <ludovic.desroches@...el.com>
Cc:	<tglx@...utronix.de>, <jason@...edaemon.net>,
	<marc.zyngier@....com>, <linux-kernel@...r.kernel.org>,
	<sasha.levin@...cle.com>, <linux-arm-kernel@...ts.infradead.org>,
	<nicolas.ferre@...el.com>, <alexandre.belloni@...e-electrons.com>,
	<Wenyou.Yang@...el.com>
Subject: Re: [PATCH 1/3] irqchip: atmel-aic5: fix bug with mask/unmask

Hi Ludovic,

On Mon, 21 Sep 2015 15:46:04 +0200
Ludovic Desroches <ludovic.desroches@...el.com> wrote:

> When masking/unmasking interrupts, mask_cache is updated and used later
> for suspend/resume. Unfortunately, it always was the mask_cache
> associated with the first irq chip which was updated. So when performing
> resume, only irqs 0-31 could be enabled and maybe not the good ones!
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
> Fixes: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers")
> Cc: stable@...r.kernel.org #3.18

To the whole series

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

Thanks,

Boris

> ---
> 
> Sasha,
> 
> This fix won't apply without conflicts because of irq_reg_writel changes. I
> can provide you a fix for 3.18 if you need.
> 
> Regards
> 
> Ludovic
> 
> 
>  drivers/irqchip/irq-atmel-aic5.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
> index 9da9942..6c5fd25 100644
> --- a/drivers/irqchip/irq-atmel-aic5.c
> +++ b/drivers/irqchip/irq-atmel-aic5.c
> @@ -88,28 +88,30 @@ static void aic5_mask(struct irq_data *d)
>  {
>  	struct irq_domain *domain = d->domain;
>  	struct irq_domain_chip_generic *dgc = domain->gc;
> -	struct irq_chip_generic *gc = dgc->gc[0];
> +	struct irq_chip_generic *bgc = dgc->gc[0];
> +	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>  
>  	/* Disable interrupt on AIC5 */
> -	irq_gc_lock(gc);
> +	irq_gc_lock(bgc);
>  	irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
>  	irq_reg_writel(gc, 1, AT91_AIC5_IDCR);
>  	gc->mask_cache &= ~d->mask;
> -	irq_gc_unlock(gc);
> +	irq_gc_unlock(bgc);
>  }
>  
>  static void aic5_unmask(struct irq_data *d)
>  {
>  	struct irq_domain *domain = d->domain;
>  	struct irq_domain_chip_generic *dgc = domain->gc;
> -	struct irq_chip_generic *gc = dgc->gc[0];
> +	struct irq_chip_generic *bgc = dgc->gc[0];
> +	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>  
>  	/* Enable interrupt on AIC5 */
> -	irq_gc_lock(gc);
> +	irq_gc_lock(bgc);
>  	irq_reg_writel(gc, d->hwirq, AT91_AIC5_SSR);
>  	irq_reg_writel(gc, 1, AT91_AIC5_IECR);
>  	gc->mask_cache |= d->mask;
> -	irq_gc_unlock(gc);
> +	irq_gc_unlock(bgc);
>  }
>  
>  static int aic5_retrigger(struct irq_data *d)



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