pci_dev structure: irq and irq_resource

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Hello,

I was looking at the pci_dev structure, and I found two different
references to IRQ:

        unsigned int irq;
        struct resource irq_resource[DEVICE_COUNT_IRQ];

I guess the irq field is an image of the PCI config. register that holds
the IRQ value for the PCI device. Question: what's the purpose of this
irq_resource field??

Thanks in advance.

Regards,
Ivan

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