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 is 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@xxxxxx>
---
drivers/pci/msi.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 9233e7f..593698e 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -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);
--
2.1.4
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