linux-kernel - Re: [PATCH 1/2] MIPS: Malta: Fix i8259 irqchip setup

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Message-ID: <20170331124916.GB26330@linux-mips.org>
Date:   Fri, 31 Mar 2017 14:49:16 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Matt Redfearn <matt.redfearn@...tec.com>
Cc:     James Hogan <james.hogan@...tec.com>, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org, Paul Burton <paul.burton@...tec.com>
Subject: Re: [PATCH 1/2] MIPS: Malta: Fix i8259 irqchip setup

On Fri, Mar 31, 2017 at 12:05:31PM +0100, Matt Redfearn wrote:

> diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
> index cb675ec6f283..474b372e0dd9 100644
> --- a/arch/mips/mti-malta/malta-int.c
> +++ b/arch/mips/mti-malta/malta-int.c
> @@ -232,6 +232,19 @@ void __init arch_init_irq(void)
>  {
>  	int corehi_irq;
>  
> +#ifdef CONFIG_I8259
> +	/*
> +	 * Preallocate the i8259's expected virq's here. Since irqchip_init()
> +	 * will probe the irqchips in hierarchial order, i8259 is probed last.
> +	 * If anything allocates a virq before the i8259 is probed, it will
> +	 * be given one of the i8259's expected range and consequently setup
> +	 * of the i8259 will fail.
> +	 */
> +	WARN(irq_alloc_descs(I8259A_IRQ_BASE, I8259A_IRQ_BASE,
> +			    16, numa_node_id()) < 0,
> +		"Cannot reserve i8259 virqs at IRQ%d\n", I8259A_IRQ_BASE);
> +#endif /* CONFIG_I8259 */
> +
>  	i8259_set_poll(mips_pcibios_iack);

CONFIG_I8259 is always defined on Malta so the #ifdef is pointless.

  Ralf