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由 Christoph Hellwig 提交于
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: NChristoph Hellwig <hch@lst.de> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
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