linux-kernel - Re: [PATCH V1 2/4] irqchip/loongson-pch-pic: Fix potential incorrect hwirq assignment

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Message-ID: <a31415d5-ca4e-49fa-60d7-9cd53ba5a680@xen0n.name>
Date:   Sun, 21 May 2023 18:31:04 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     Jianmin Lv <lvjianmin@...ngson.cn>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn,
        Liu Peibao <liupeibao@...ngson.cn>, stable@...r.kernel.org
Subject: Re: [PATCH V1 2/4] irqchip/loongson-pch-pic: Fix potential incorrect
 hwirq assignment

On 2023/5/20 14:38, Jianmin Lv wrote:
> From: Liu Peibao <liupeibao@...ngson.cn>
> 
> In DeviceTree path, when ht_vec_base is not zero, the hwirq of PCH PIC will
> be assigned incorrectly. Because when pch_pic_domain_translate() adds the
> ht_vec_base to hwirq, the hwirq dose not subtract the ht_vec_base when

"does not have the ht_vec_base subtracted"?

> calling irq_domain_set_info().
> 
> The ht_vec_base is designed for the parent irq chip/domain of the PCH PIC.
> It seems not proper to deal this in callbacks of the PCH PIC domain and
> let's put this back like the initial commit ef8c01eb64ca ("irqchip: Add
> Loongson PCH PIC controller").
> 
> Fixes: bcdd75c596c8 ("irqchip/loongson-pch-pic: Add ACPI init support")
> Cc: stable@...r.kernel.org
> Signed-off-by: Liu Peibao <liupeibao@...ngson.cn>
> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> ---
>   drivers/irqchip/irq-loongson-pch-pic.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
> index 921c5c0190d1..93a71f66efeb 100644
> --- a/drivers/irqchip/irq-loongson-pch-pic.c
> +++ b/drivers/irqchip/irq-loongson-pch-pic.c
> @@ -164,7 +164,7 @@ static int pch_pic_domain_translate(struct irq_domain *d,
>   		if (fwspec->param_count < 2)
>   			return -EINVAL;
>   
> -		*hwirq = fwspec->param[0] + priv->ht_vec_base;
> +		*hwirq = fwspec->param[0];
>   		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
>   	} else {
>   		if (fwspec->param_count < 1)
> @@ -196,7 +196,7 @@ static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq,
>   
>   	parent_fwspec.fwnode = domain->parent->fwnode;
>   	parent_fwspec.param_count = 1;
> -	parent_fwspec.param[0] = hwirq;
> +	parent_fwspec.param[0] = hwirq + priv->ht_vec_base;
>   
>   	err = irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
>   	if (err)

-- 
WANG "xen0n" Xuerui

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