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| author | Christoph Hellwig <hch@lst.de> | 2017-02-01 14:41:42 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-02-10 16:05:06 -0600 |
| commit | 862290f9e23c39051e59bf12ce65707a8ec8b911 (patch) | |
| tree | 992c822cae2bf5a70159fdf044732c4e6baf3b0b /drivers/pci/msi.c | |
| parent | 699c4cec238731a4c466f73fe6e9e45ab6f49a41 (diff) | |
| download | linux-862290f9e23c39051e59bf12ce65707a8ec8b911.tar.gz linux-862290f9e23c39051e59bf12ce65707a8ec8b911.tar.bz2 linux-862290f9e23c39051e59bf12ce65707a8ec8b911.zip | |
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 <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/msi.c')
| -rw-r--r-- | drivers/pci/msi.c | 8 |
1 files 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; |