question about pci_enable_msix_range

From: Julia Lawall
Date: Tue Mar 15 2016 - 06:27:09 EST


Hello,

I was looking at the following code in the file
drivers/vfio/pci/vfio_pci_intrs.c:

ret = pci_enable_msix_range(pdev, vdev->msix, 1, nvec);
if (ret < nvec) {
if (ret > 0)
pci_disable_msix(pdev);
kfree(vdev->msix);
kfree(vdev->ctx);
return ret;
}

I was wondering what is the point of using a range of 1 .. nvec if there
is going to be a failure if the number of allocated irqs is less than
nvec?

thanks,
julia