linux-kernel - Re: [PATCH] irqchip/jcore-aic: Fix missing allocation of IRQ descriptors

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Message-ID: <479a18513b9d8c6e8ccb96093a0f0dd7@kernel.org>
Date:   Thu, 11 May 2023 07:56:29 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Rich Felker <dalias@...c.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irqchip/jcore-aic: Fix missing allocation of IRQ
 descriptors

On 2023-05-10 17:33, John Paul Adrian Glaubitz wrote:
> The initialization function for the J-Core AIC aic_irq_of_init() is
> currently missing the call to irq_alloc_descs() which allocates and
> initializes all the IRQ descriptors. Add missing function call and
> return the error code from irq_alloc_descs() in case the allocation
> fails.
> 
> Fixes: 981b58f66cfc ("irqchip/jcore-aic: Add J-Core AIC driver")
> Signed-off-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
> ---
>  drivers/irqchip/irq-jcore-aic.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-jcore-aic.c 
> b/drivers/irqchip/irq-jcore-aic.c
> index 5f47d8ee4ae3..b9dcc8e78c75 100644
> --- a/drivers/irqchip/irq-jcore-aic.c
> +++ b/drivers/irqchip/irq-jcore-aic.c
> @@ -68,6 +68,7 @@ static int __init aic_irq_of_init(struct device_node 
> *node,
>  	unsigned min_irq = JCORE_AIC2_MIN_HWIRQ;
>  	unsigned dom_sz = JCORE_AIC_MAX_HWIRQ+1;
>  	struct irq_domain *domain;
> +	int ret;
> 
>  	pr_info("Initializing J-Core AIC\n");
> 
> @@ -100,6 +101,12 @@ static int __init aic_irq_of_init(struct 
> device_node *node,
>  	jcore_aic.irq_unmask = noop;
>  	jcore_aic.name = "AIC";
> 
> +	ret = irq_alloc_descs(-1, min_irq, dom_sz - min_irq,
> +			      of_node_to_nid(node));
> +
> +	if (ret < 0)
> +		return ret;
> +
>  	domain = irq_domain_add_legacy(node, dom_sz - min_irq, min_irq, 
> min_irq,
>  				       &jcore_aic_irqdomain_ops,
>  				       &jcore_aic);

[- Jason]

It really begs the question: how has it ever been working before?

Is there any plan to modernise the port and get it to allocate
irq_descs on demand, as we do on most architectures?

         M.
-- 
Jazz is not dead. It just smells funny...