Re: [patch V2 28/36] PCI/MSI: Use __msi_get_virq() in pci_get_vector()

Bjorn Helgaas
2021-12-07T21:05:54Z

On Mon, Dec 06, 2021 at 11:39:41PM +0100, Thomas Gleixner wrote:
> Use msi_get_vector() and handle the return value to be compatible.
>
> No functional change intended.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
> V2: Handle the INTx case directly instead of trying to be overly smart - Marc
> ---
> drivers/pci/msi/msi.c | 25 +++++--------------------
> 1 file changed, 5 insertions(+), 20 deletions(-)
>
> --- a/drivers/pci/msi/msi.c
> +++ b/drivers/pci/msi/msi.c
> @@ -1032,28 +1032,13 @@ EXPORT_SYMBOL(pci_free_irq_vectors);
> */
> int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
> {
> - if (dev->msix_enabled) {
> - struct msi_desc *entry;
> + unsigned int irq;
>
> - for_each_pci_msi_entry(entry, dev) {
> - if (entry->msi_index == nr)
> - return entry->irq;
> - }
> - WARN_ON_ONCE(1);
> - return -EINVAL;
> - }
> + if (!dev->msi_enabled && !dev->msix_enabled)
> + return !nr ? dev->irq : -EINVAL;
>
> - if (dev->msi_enabled) {
> - struct msi_desc *entry = first_pci_msi_entry(dev);
> -
> - if (WARN_ON_ONCE(nr >= entry->nvec_used))
> - return -EINVAL;
> - } else {
> - if (WARN_ON_ONCE(nr > 0))
> - return -EINVAL;
> - }
> -
> - return dev->irq + nr;
> + irq = msi_get_virq(&dev->dev, nr);
> + return irq ? irq : -EINVAL;
> }
> EXPORT_SYMBOL(pci_irq_vector);
>
>