From 862290f9e23c39051e59bf12ce65707a8ec8b911 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 1 Feb 2017 14:41:42 +0100 Subject: [PATCH] PCI/MSI: Check that we have a legacy interrupt line before using it 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 Signed-off-by: Bjorn Helgaas --- 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 b44ad7c21b29..52ac675f0bd7 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1198,9 +1198,11 @@ 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;