ACPI: PCI: remove callback from acpi_pci_irq_lookup & acpi_pci_irq_derive

We currently pass a callback function (either acpi_pci_allocate_irq() or
acpi_pci_free_irq()) to acpi_pci_irq_lookup() and acpi_pci_irq_derive().

I think it's simpler to remove the callback and just have the enable/
disable functions make the calls directly.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 36 insertions, 57 deletions

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 7978c97afb0a..28338227dd5e 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -339,8 +339,6 @@ void acpi_pci_irq_del_prt(int segment, int bus)
 /* --------------------------------------------------------------------------
                           PCI Interrupt Routing Support
    -------------------------------------------------------------------------- */
-typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
-
 static int
 acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
                       int *triggering, int *polarity, char **link)
@@ -368,8 +366,7 @@ acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
 }
 
 static int
-acpi_pci_free_irq(struct acpi_prt_entry *entry,
-                  int *triggering, int *polarity, char **link)
+acpi_pci_free_irq(struct acpi_prt_entry *entry)
 {
         int irq;
 
@@ -381,47 +378,29 @@ acpi_pci_free_irq(struct acpi_prt_entry *entry,
         return irq;
 }
 
-/*
- * acpi_pci_irq_lookup
- * success: return IRQ >= 0
- * failure: return -1
- */
-static int
-acpi_pci_irq_lookup(struct pci_dev *dev, int pin,
-                    int *triggering,
-                    int *polarity, char **link, irq_lookup_func func)
+static struct acpi_prt_entry *
+acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
 {
-        struct acpi_prt_entry *entry = NULL;
-        int ret;
-
+        struct acpi_prt_entry *entry;
 
         entry = acpi_pci_irq_find_prt_entry(dev, pin);
         if (!entry) {
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No %s[%c] _PRT entry\n",
                                   pci_name(dev), pin_name(pin)));
-                return -1;
+                return NULL;
         }
 
         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
                           pci_name(dev), pin_name(pin)));
 
-        ret = func(entry, triggering, polarity, link);
-        return ret;
+        return entry;
 }
 
-/*
- * acpi_pci_irq_derive
- * success: return IRQ >= 0
- * failure: return < 0
- */
-static int
-acpi_pci_irq_derive(struct pci_dev *dev,
-                    int pin,
-                    int *triggering,
-                    int *polarity, char **link, irq_lookup_func func)
+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 = dev;
-        int irq = -1;
         u8 bridge_pin = 0, orig_pin = pin;
 
 
@@ -429,7 +408,7 @@ acpi_pci_irq_derive(struct pci_dev *dev,
          * 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).
          */
-        while (irq < 0 && bridge->bus->self) {
+        while (!entry && bridge->bus->self) {
                 pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
                 bridge = bridge->bus->self;
 
@@ -440,26 +419,24 @@ acpi_pci_irq_derive(struct pci_dev *dev,
                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                                   "No interrupt pin configured for device %s\n",
                                                   pci_name(bridge)));
-                                return -1;
+                                return NULL;
                         }
                         pin = bridge_pin;
                 }
 
-                irq = acpi_pci_irq_lookup(bridge,
-                                          pin, triggering, polarity,
-                                          link, func);
+                entry = acpi_pci_irq_lookup(bridge, pin);
         }
 
-        if (irq < 0) {
+        if (!entry) {
                 dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
                          pin_name(orig_pin));
-                return -1;
+                return NULL;
         }
 
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derived GSI %d for %s INT %c from %s\n",
-                          irq, pci_name(dev), pin_name(orig_pin), pci_name(bridge)));
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derived GSI for %s INT %c from %s\n",
+                          pci_name(dev), pin_name(orig_pin), pci_name(bridge)));
 
-        return irq;
+        return entry;
 }
 
 /*
@@ -470,6 +447,7 @@ acpi_pci_irq_derive(struct pci_dev *dev,
 
 int acpi_pci_irq_enable(struct pci_dev *dev)
 {
+        struct acpi_prt_entry *entry;
         int gsi = 0;
         u8 pin = 0;
         int triggering = ACPI_LEVEL_SENSITIVE;
@@ -491,18 +469,20 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
          * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
          * values override any BIOS-assigned IRQs set during boot.
          */
-        gsi = acpi_pci_irq_lookup(dev, pin,
-                                  &triggering, &polarity, &link,
-                                  acpi_pci_allocate_irq);
+        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 (gsi < 0)
-                gsi = acpi_pci_irq_derive(dev, pin, &triggering,
-                                          &polarity, &link,
-                                          acpi_pci_allocate_irq);
+        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) {
                 /*
@@ -559,10 +539,9 @@ void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
 
 void acpi_pci_irq_disable(struct pci_dev *dev)
 {
+        struct acpi_prt_entry *entry;
         int gsi = 0;
         u8 pin = 0;
-        int triggering = ACPI_LEVEL_SENSITIVE;
-        int polarity = ACPI_ACTIVE_LOW;
 
 
         pin = dev->pin;
@@ -572,20 +551,20 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
         /*
          * First we check the PCI IRQ routing table (PRT) for an IRQ.
          */
-        gsi = acpi_pci_irq_lookup(dev, pin,
-                                  &triggering, &polarity, NULL,
-                                  acpi_pci_free_irq);
+        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 (gsi < 0)
-                gsi = acpi_pci_irq_derive(dev, pin,
-                                          &triggering, &polarity, NULL,
-                                          acpi_pci_free_irq);
-        if (gsi < 0)
+        if (!entry)
+                entry = acpi_pci_irq_derive(dev, pin);
+
+        if (!entry)
                 return;
 
+        gsi = acpi_pci_free_irq(entry);
+
         /*
          * TBD: It might be worth clearing dev->irq by magic constant
          * (e.g. PCI_UNDEFINED_IRQ).