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    SubjectRe: [PATCH] usb: enable pci MSI/MSIX in usb core
    Alex,Shi wrote:
    >> The controller driver will need to know which of the multiple MSI-X
    >> interrupts has been raised:
    >> irqreturn_t (*msix_irq)(struct usb_hcd *hcd, unsigned int nr_or_index);
    > Actually, hcd has 2 object for msix, msix_count and msix_entries.
    > Do you mean msix_count maybe smaller than we decide in hcd_setup_msix()?

    No. But when msic_count > 1, we have multiple interrupts.

    > Which situation will make this?

    Assume that an XHCI controller has two rings, and that each one gets its
    own MSI-X interrupt. How should the driver decide which of the rings
    needs to be handled?

    irqreturn_t xhci_msix_irq(struct usb_hcd *hcd)
    struct xhci_hcd *xhci = hcd_to_xhci(hcd);

    if (...)

    I.e., what should go into the if()?


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