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PCI: Call pci_intx() when using legacy interrupts in pci_alloc_irq_vectors() 

ahci currently insists on an explicit call to pci_intx() before falling
back from MSI or MSI-X to legacy IRQs.  As pci_intx() is a no-op if the
command register already contains the right value it seems safe and useful
to add this call to pci_alloc_irq_vectors() so that ahci can just use
pci_alloc_irq_vectors().

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Christoph Hellwig 2016-08-11 07:11:05 -07:00 committed by Bjorn Helgaas
parent 4fe0d15488
commit 5d0bdf2867
1 changed files with 4 additions and 1 deletions
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5
drivers/pci/msi.c
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@ -1200,8 +1200,11 @@ int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
}
/* use legacy irq if allowed */
if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1)
if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1) {
pci_intx(dev, 1);
return 1;
}
return vecs;
}
EXPORT_SYMBOL(pci_alloc_irq_vectors);