On Sun, Jul 10, 2016 at 08:57:45PM +0900, Christoph Hellwig wrote:
> +/**
> + * pci_irq_vector - return Linux IRQ number of a device vector
> + * @dev: PCI device to operate on
> + * @nr: device-relative interrupt vector index (0-based).
> + */
> +int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
> +{
> + if (dev->msix_enabled) {
> + struct msi_desc *entry;
> + int i = 0;
> +
> + for_each_pci_msi_entry(entry, dev) {
> + if (i == nr)
> + return entry->irq;
> + i++;
> + }
> + WARN_ON_ONCE(1);
> + return -EINVAL;
> + }
> +
> + if (WARN_ON_ONCE(!dev->msi_enabled && nr > 0))
> + return -EINVAL;
Something like this is also needed here:
if (WARN_ON_ONCE(nr >= msi_desc::nvec_used))
return -EINVAL;
> + return dev->irq + nr;
> +}
> +EXPORT_SYMBOL(pci_irq_vector);
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