It seems like there are some devices (e.g. the PCIe root port driver) that
may not always have a INTx interrupt. Check for dev->irq before returning
a legacy interrupt in pci_irq_alloc_vectors to properly handle this case.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/pci/msi.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 16dda43..98525f6 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1217,9 +1217,11 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
}
/* use legacy irq if allowed */
- if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1) {
- pci_intx(dev, 1);
- return 1;
+ if (flags & PCI_IRQ_LEGACY) {
+ if (min_vecs == 1 && dev->irq) {
+ pci_intx(dev, 1);
+ return 1;
+ }
}
return vecs;
--
2.1.4
