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

[周彬彬 <zhoubinbin@loongson.cn>]

> -----原始邮件-----
> 发件人: "Rob Herring" <robh@kernel.org>
> 发送时间:2023-02-11 00:43:51 (星期六)
> 收件人: "Bjorn Helgaas" <bhelgaas@google.com>
> 抄送: "Liu Peibao" <liupeibao@loongson.cn>, "Binbin Zhou" <zhoubinbin@loongson.cn>, "Huacai Chen" <chenhuacai@loongson.cn>, linux-pci@vger.kernel.org, linux-kernel@vger.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@loongson.cn>
> Cc: Binbin Zhou <zhoubinbin@loongson.cn>
> Cc: Huacai Chen <chenhuacai@loongson.cn>
> Signed-off-by: Rob Herring <robh@kernel.org>

Tested-by: Binbin Zhou <zhoubinbin@loongson.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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