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ACPI: PCI: combine lookup and derive 

This folds acpi_pci_irq_derive() into acpi_pci_irq_lookup() so it
can be easily used by both acpi_pci_irq_enable() and acpi_pci_irq_disable().

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2008-12-08 21:31:16 -07:00 committed by Len Brown
parent ee40136313
commit 5697b7ca40
1 changed files with 11 additions and 44 deletions
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55
drivers/acpi/pci_irq.c
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@ -382,6 +382,8 @@ static struct acpi_prt_entry *
acpi_pci_irq_lookup(struct pci_dev *dev, int pin) acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
{ {
struct acpi_prt_entry *entry; struct acpi_prt_entry *entry;
struct pci_dev *bridge;
u8 bridge_pin, orig_pin = pin;
entry = acpi_pci_irq_find_prt_entry(dev, pin); entry = acpi_pci_irq_find_prt_entry(dev, pin);
if (entry) { if (entry) {
@ -390,19 +392,6 @@ acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
return entry; return entry;
} }
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No %s[%c] _PRT entry\n",
pci_name(dev), pin_name(pin)));
return NULL;
}
static struct acpi_prt_entry *
acpi_pci_irq_derive(struct pci_dev *dev, int pin)
{
struct acpi_prt_entry *entry = NULL;
struct pci_dev *bridge;
u8 bridge_pin = 0, orig_pin = pin;
/* /*
* Attempt to derive an IRQ for this device from a parent bridge's * Attempt to derive an IRQ for this device from a parent bridge's
* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
@ -423,7 +412,7 @@ acpi_pci_irq_derive(struct pci_dev *dev, int pin)
pin = bridge_pin; pin = bridge_pin;
} }
entry = acpi_pci_irq_lookup(bridge, pin); entry = acpi_pci_irq_find_prt_entry(bridge, pin);
if (entry) { if (entry) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Derived GSI for %s INT %c from %s\n", "Derived GSI for %s INT %c from %s\n",
@ -467,26 +456,8 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
return 0; return 0;
} }
/*
* First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
* values override any BIOS-assigned IRQs set during boot.
*/
entry = acpi_pci_irq_lookup(dev, pin); entry = acpi_pci_irq_lookup(dev, pin);
if (!entry) {
/*
* If no PRT entry was found, we'll try to derive an IRQ from the
* device's parent bridge.
*/
if (!entry)
entry = acpi_pci_irq_derive(dev, pin);
if (entry)
gsi = acpi_pci_allocate_irq(entry, &triggering, &polarity,
&link);
else
gsi = -1;
if (gsi < 0) {
/* /*
* IDE legacy mode controller IRQs are magic. Why do compat * IDE legacy mode controller IRQs are magic. Why do compat
* extensions always make such a nasty mess. * extensions always make such a nasty mess.
@ -495,6 +466,13 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
(dev->class & 0x05) == 0) (dev->class & 0x05) == 0)
return 0; return 0;
} }
if (entry)
gsi = acpi_pci_allocate_irq(entry, &triggering, &polarity,
&link);
else
gsi = -1;
/* /*
* No IRQ known to the ACPI subsystem - maybe the BIOS / * No IRQ known to the ACPI subsystem - maybe the BIOS /
* driver reported one, then use it. Exit in any case. * driver reported one, then use it. Exit in any case.
@ -550,18 +528,7 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
if (!pin) if (!pin)
return; return;
/*
* First we check the PCI IRQ routing table (PRT) for an IRQ.
*/
entry = acpi_pci_irq_lookup(dev, pin); entry = acpi_pci_irq_lookup(dev, pin);
/*
* If no PRT entry was found, we'll try to derive an IRQ from the
* device's parent bridge.
*/
if (!entry)
entry = acpi_pci_irq_derive(dev, pin);
if (!entry) if (!entry)
return; return;