linux-kernel - Re: [patch] irqchip/dw-apb-ictl: Fix generic domain chip wreckage

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Date:	Mon, 6 Jul 2015 14:36:40 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jisheng Zhang <jszhang@...vell.com>
cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	Jason Cooper <jason@...edaemon.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] irqchip/dw-apb-ictl: Fix generic domain chip wreckage

On Mon, 6 Jul 2015, Jisheng Zhang wrote:
> > Thomas Gleixner <tglx@...utronix.de> wrote:
> the following patch seems fix the panic, but I dunno whether it's correct or not,
> could you please help to check?
> 
> Thanks,
> Jisheng
> 
> diff --git a/drivers/irqchip/irq-dw-apb-ictl.c b/drivers/irqchip/irq-dw-apb-ictl.c
> index f4a0e11..8d996cb 100644
> --- a/drivers/irqchip/irq-dw-apb-ictl.c
> +++ b/drivers/irqchip/irq-dw-apb-ictl.c
> @@ -30,13 +30,14 @@
>  static void dw_apb_ictl_handler(unsigned int irq, struct irq_desc *desc)
>  {
>  	struct irq_domain *d = irq_desc_get_handler_data(desc);
> -	struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0);
> +	struct irq_chip_generic *gc;
>  	struct irq_chip *chip = irq_desc_get_chip(desc);
>  	int n;
>  
>  	chained_irq_enter(chip, desc);
>  
> -	for (n = 0; n < d->gc->num_chips; n++, gc++) {
> +	for (n = 0; n < d->gc->num_chips; n++) {
> +		gc = irq_get_domain_generic_chip(d, n * 32);
>  		u32 stat = readl_relaxed(gc->reg_base + APB_INT_FINALSTATUS_L);

Yes it's correct. Seems I tried to be overly clever by avoiding the
lookup of the second chip. Will fold back.

Thanks,

	tglx


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