linux-kernel - Re: [PATCH v2] PCI: use local_pci_probe when best selected cpu is offline

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Date: Wed, 12 Jun 2024 12:51:56 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Hongchen Zhang <zhanghongchen@...ngson.cn>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org, 
	linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev, 
	stable@...r.kernel.org, Huacai Chen <chenhuacai@...ngson.cn>
Subject: Re: [PATCH v2] PCI: use local_pci_probe when best selected cpu is offline

Hi, Hongchen,

It seems you forgot to update the title which I have pointed out. :)

And Bjorn,

Could you please take some time to review this patch? Thank you.

Huacai

On Wed, Jun 5, 2024 at 3:54 PM Hongchen Zhang <zhanghongchen@...ngson.cn> wrote:
>
> When the best selected CPU is offline, work_on_cpu() will stuck forever.
> This can be happen if a node is online while all its CPUs are offline
> (we can use "maxcpus=1" without "nr_cpus=1" to reproduce it), Therefore,
> in this case, we should call local_pci_probe() instead of work_on_cpu().
>
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> Signed-off-by: Hongchen Zhang <zhanghongchen@...ngson.cn>
> ---
> v1 -> v2 Added the method to reproduce this issue
> ---
>  drivers/pci/pci-driver.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index af2996d0d17f..32a99828e6a3 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -386,7 +386,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
>                 free_cpumask_var(wq_domain_mask);
>         }
>
> -       if (cpu < nr_cpu_ids)
> +       if ((cpu < nr_cpu_ids) && cpu_online(cpu))
>                 error = work_on_cpu(cpu, local_pci_probe, &ddi);
>         else
>                 error = local_pci_probe(&ddi);
> --
> 2.33.0
>
>