On 10/02/2013 03:29 AM, Alexander Gordeev wrote:
>
> As result, device drivers will cease to use the overcomplicated
> repeated fallbacks technique and resort to a straightforward
> pattern - determine the number of MSI/MSI-X interrupts required
> before calling pci_enable_msi_block() and pci_enable_msix()
> interfaces:
>
>
> rc = pci_msix_table_size(adapter->pdev);
> if (rc < 0)
> return rc;
>
> nvec = min(nvec, rc);
> if (nvec < FOO_DRIVER_MINIMUM_NVEC) {
> return -ENOSPC;
>
> for (i = 0; i < nvec; i++)
> adapter->msix_entries[i].entry = i;
>
> rc = pci_enable_msix(adapter->pdev,
> adapter->msix_entries, nvec);
> return rc;
>
Why not add a minimum number to pci_enable_msix(), i.e.:
pci_enable_msix(pdev, msix_entries, nvec, minvec)
... which means "nvec" is the number of interrupts *requested*, and
"minvec" is the minimum acceptable number (otherwise fail).
-hpa
