linux-kernel - Re: [PATCH] PCI: Honor firmware's device disabled status

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Date:   Sat, 11 Feb 2023 10:39:19 +0800 (GMT+08:00)
From:   周彬彬 <zhoubinbin@...ngson.cn>
To:     "Rob Herring" <robh@...nel.org>
Cc:     "Bjorn Helgaas" <bhelgaas@...gle.com>,
        "Liu Peibao" <liupeibao@...ngson.cn>,
        "Huacai Chen" <chenhuacai@...ngson.cn>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Honor firmware's device disabled status

> -----原始邮件-----
> 发件人: "Rob Herring" <robh@...nel.org>
> 发送时间:2023-02-11 00:43:51 (星期六)
> 收件人: "Bjorn Helgaas" <bhelgaas@...gle.com>
> 抄送: "Liu Peibao" <liupeibao@...ngson.cn>, "Binbin Zhou" <zhoubinbin@...ngson.cn>, "Huacai Chen" <chenhuacai@...ngson.cn>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
> 主题: [PATCH] PCI: Honor firmware's device disabled status
> 
> If a device has a firmware node (DT/ACPI), and the device is marked
> disabled, that is currently ignored. Add a check for this condition
> and bail out creating the pci_dev.
> 
> This assumes the config space for the device can still be accessed
> because they already have by this point in order to identify the device.
> 
> Cc: Liu Peibao <liupeibao@...ngson.cn>
> Cc: Binbin Zhou <zhoubinbin@...ngson.cn>
> Cc: Huacai Chen <chenhuacai@...ngson.cn>
> Signed-off-by: Rob Herring <robh@...nel.org>

Tested-by: Binbin Zhou <zhoubinbin@...ngson.cn>

> ---
> Please test if this works for Loongson.
> ---
>  drivers/pci/probe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 1779582fb500..b1d80c1d7a69 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1841,6 +1841,8 @@ int pci_setup_device(struct pci_dev *dev)
>  
>  	pci_set_of_node(dev);
>  	pci_set_acpi_fwnode(dev);
> +	if (dev->dev.fwnode && !fwnode_device_is_available(dev->dev.fwnode))
> +		return -ENODEV;
>  
>  	pci_dev_assign_slot(dev);
>  
> -- 
> 2.39.1

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