Function acpi_pci_irq_enable() may be called twice for each PCI device
present at boot time as below:
1) pci_acpi_init()
--> acpi_pci_irq_enable()
2) pci_enable_device()
--> pcibios_enable_device()
--> acpi_pci_irq_enable()
So protect acpi_pci_irq_enable() from reentrance to correctly manage
IOAPIC pin reference count.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
drivers/acpi/pci_irq.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 6ba463ceccc6..9d2ebd5fd9aa 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -413,6 +413,9 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
return 0;
}
+ if (dev->irq > 0)
+ return 0;
+
entry = acpi_pci_irq_lookup(dev, pin);
if (!entry) {
/*
@@ -498,6 +501,8 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
*/
dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
- if (gsi >= 0 && dev->irq > 0)
+ if (gsi >= 0 && dev->irq > 0) {
acpi_unregister_gsi(gsi);
+ dev->irq = 0;
+ }
}
--
1.7.10.4
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