Merge tag 'pci-v4.11-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...

[karo-tx-linux.git] / drivers / pci / msi.c

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 78e4a1adb6b011389d4c2a17f4d607877e475131..980eaf588281808a8e8e0431b717ec6120d05cf8 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1179,6 +1179,16 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
        if (flags & PCI_IRQ_AFFINITY) {
                if (!affd)
                        affd = &msi_default_affd;
+
+               if (affd->pre_vectors + affd->post_vectors > min_vecs)
+                       return -EINVAL;
+
+               /*
+                * If there aren't any vectors left after applying the pre/post
+                * vectors don't bother with assigning affinity.
+                */
+               if (affd->pre_vectors + affd->post_vectors == min_vecs)
+                       affd = NULL;
        } else {
                if (WARN_ON(affd))
                        affd = NULL;