linux-kernel - Re: [PATCH v3 1/2] irqchip/loongson-eiointc: Fix return value checking of eiointc

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Message-ID: <CAAhV-H5k-FVhrRAQj58dckQAGPT9PNp2ghCCfHOMtsr3gf-wRw@mail.gmail.com>
Date:   Tue, 11 Jul 2023 23:06:36 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Bibo Mao <maobibo@...ngson.cn>
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Marc Zyngier <maz@...nel.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jianmin Lv <lvjianmin@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v3 1/2] irqchip/loongson-eiointc: Fix return value
 checking of eiointc_index

On Tue, Jul 11, 2023 at 8:08 PM Bibo Mao <maobibo@...ngson.cn> wrote:
>
> Return value of function eiointc_index is int, however it is converted
> into uint32_t and then compared smaller than zero. This causes logic
> problem. There is eioint initialization problem on qemu virt-machine
> where there is only one eioint node and more than 4 vcpus. Nodemap of
> eioint is 1, and external device intr can only be routed to vcpu 0-3, the
> other vcpus can not response any external device interrupts and only local
> processor interrupts like ipi/timer can work.
I'm sorry but there are still spelling problems...
"eio", "eio intc", "eioint" should all be "eiointc".

Huacai

>
> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
> ---
>  drivers/irqchip/irq-loongson-eiointc.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
> index 92d8aa28bdf5..1c5a5b59f199 100644
> --- a/drivers/irqchip/irq-loongson-eiointc.c
> +++ b/drivers/irqchip/irq-loongson-eiointc.c
> @@ -144,12 +144,14 @@ static int eiointc_router_init(unsigned int cpu)
>         int i, bit;
>         uint32_t data;
>         uint32_t node = cpu_to_eio_node(cpu);
> -       uint32_t index = eiointc_index(node);
> +       int index = eiointc_index(node);
>
> -       if (index < 0) {
> -               pr_err("Error: invalid nodemap!\n");
> -               return -1;
> -       }
> +       /*
> +        * qemu virt-machine has only one eio intc and more than four cpus
> +        * irq from eio can only be routed to cpu 0-3 on virt machine
> +        */
> +       if (index < 0)
> +               return 0;
>
>         if ((cpu_logical_map(cpu) % CORES_PER_EIO_NODE) == 0) {
>                 eiointc_enable();
> --
> 2.27.0
>