ACPI / hotplug / PCI: Drop sun field from struct acpiphp_slot

If the slot unique number is passed as an additional argument to
acpiphp_register_hotplug_slot(), the 'sun' field in struct
acpiphp_slot is only used by ibm_[s|g]et_attention_status(),
but then it's more efficient to store it in struct slot.

Thus move the 'sun' field from struct acpiphp_slot to struct slot
changing its data type to unsigned int in the process, and redefine
acpiphp_register_hotplug_slot() to take the slot number as separate
argument.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/pci/hotplug/acpiphp.h

@@ -60,6 +60,7 @@ struct slot {
 	struct hotplug_slot	*hotplug_slot;
 	struct acpiphp_slot	*acpi_slot;
 	struct hotplug_slot_info info;
+	unsigned int sun;	/* ACPI _SUN (Slot User Number) value */
 };
 
 static inline const char *slot_name(struct slot *slot)
@@ -106,8 +107,6 @@ struct acpiphp_slot {
 	struct mutex crit_sect;
 
 	u8		device;		/* pci device# */
-
-	unsigned long long sun;		/* ACPI _SUN (slot unique number) */
 	u32		flags;		/* see below */
 };
 
@@ -179,7 +178,7 @@ struct acpiphp_attention_info
 /* acpiphp_core.c */
 int acpiphp_register_attention(struct acpiphp_attention_info*info);
 int acpiphp_unregister_attention(struct acpiphp_attention_info *info);
-int acpiphp_register_hotplug_slot(struct acpiphp_slot *slot);
+int acpiphp_register_hotplug_slot(struct acpiphp_slot *slot, unsigned int sun);
 void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot);
 
 /* acpiphp_glue.c */

drivers/pci/hotplug/acpiphp_core.c

@@ -290,7 +290,8 @@ static void release_slot(struct hotplug_slot *hotplug_slot)
 }
 
 /* callback routine to initialize 'struct slot' for each slot */
-int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
+int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot,
+				  unsigned int sun)
 {
 	struct slot *slot;
 	int retval = -ENOMEM;
@@ -317,7 +318,8 @@ int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
 	slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
 
 	acpiphp_slot->slot = slot;
-	snprintf(name, SLOT_NAME_SIZE, "%llu", slot->acpi_slot->sun);
+	slot->sun = sun;
+	snprintf(name, SLOT_NAME_SIZE, "%u", sun);
 
 	retval = pci_hp_register(slot->hotplug_slot,
 					acpiphp_slot->bridge->pci_bus,

drivers/pci/hotplug/acpiphp_glue.c

@@ -352,16 +352,15 @@ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
 		if (ACPI_FAILURE(status))
 			sun = bridge->nr_slots;
 
-		slot->sun = sun;
 		dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
-		    slot->sun, pci_domain_nr(pbus), pbus->number, device);
+		    sun, pci_domain_nr(pbus), pbus->number, device);
 
-		retval = acpiphp_register_hotplug_slot(slot);
+		retval = acpiphp_register_hotplug_slot(slot, sun);
 		if (retval) {
 			bridge->nr_slots--;
 			if (retval == -EBUSY)
 				warn("Slot %llu already registered by another "
-					"hotplug driver\n", slot->sun);
+					"hotplug driver\n", sun);
 			else
 				warn("acpiphp_register_hotplug_slot failed "
 					"(err code = 0x%x)\n", retval);

drivers/pci/hotplug/acpiphp_ibm.c

@@ -66,7 +66,7 @@ do {							\
 #define IBM_HARDWARE_ID1 "IBM37D0"
 #define IBM_HARDWARE_ID2 "IBM37D4"
 
-#define hpslot_to_sun(A) (((struct slot *)((A)->private))->acpi_slot->sun)
+#define hpslot_to_sun(A) (((struct slot *)((A)->private))->sun)
 
 /* union apci_descriptor - allows access to the
  * various device descriptors that are embedded in the