From 2552002a46cd6a7a262ea1718db33d1a1517008e Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Sat, 13 Jul 2013 23:27:23 +0200
Subject: [PATCH] ACPI / hotplug / PCI: Consolidate acpiphp_enumerate_slots()

The acpiphp_enumerate_slots() function is now split into two parts,
acpiphp_enumerate_slots() proper and init_bridge_misc() which is
only called by the former.  If these functions are combined,
it is possible to make the code easier to follow and to clean up
the error handling (to prevent memory leaks on error from
happening in particular), so do that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/pci/hotplug/acpiphp_glue.c | 92 +++++++++++++++---------------
 1 file changed, 45 insertions(+), 47 deletions(-)

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index a203ba529fef..68c3809ed7ce 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -353,46 +353,6 @@ static int detect_ejectable_slots(acpi_handle handle)
 	return found;
 }
 
-/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
-static void init_bridge_misc(struct acpiphp_bridge *bridge)
-{
-	acpi_status status;
-
-	/* must be added to the list prior to calling register_slot */
-	mutex_lock(&bridge_mutex);
-	list_add(&bridge->list, &bridge_list);
-	mutex_unlock(&bridge_mutex);
-
-	/* register all slot objects under this bridge */
-	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
-				     register_slot, NULL, bridge, NULL);
-	if (ACPI_FAILURE(status)) {
-		mutex_lock(&bridge_mutex);
-		list_del(&bridge->list);
-		mutex_unlock(&bridge_mutex);
-		return;
-	}
-
-	/* install notify handler for P2P bridges */
-	if (!pci_is_root_bus(bridge->pci_bus)) {
-		if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
-			status = acpi_remove_notify_handler(bridge->func->handle,
-						ACPI_SYSTEM_NOTIFY,
-						handle_hotplug_event_func);
-			if (ACPI_FAILURE(status))
-				err("failed to remove notify handler\n");
-		}
-		status = acpi_install_notify_handler(bridge->handle,
-					     ACPI_SYSTEM_NOTIFY,
-					     handle_hotplug_event_bridge,
-					     bridge);
-
-		if (ACPI_FAILURE(status)) {
-			err("failed to register interrupt notify handler\n");
-		}
-	}
-}
-
 
 /* find acpiphp_func from acpiphp_bridge */
 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
@@ -1149,8 +1109,9 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type,
  */
 void acpiphp_enumerate_slots(struct pci_bus *bus)
 {
-	acpi_handle handle;
 	struct acpiphp_bridge *bridge;
+	acpi_handle handle;
+	acpi_status status;
 
 	if (acpiphp_disabled)
 		return;
@@ -1178,14 +1139,51 @@ void acpiphp_enumerate_slots(struct pci_bus *bus)
 	 */
 	get_device(&bus->dev);
 
-	if (!pci_is_root_bus(bridge->pci_bus) &&
-	    acpi_has_method(bridge->handle, "_EJ0")) {
-		dbg("found ejectable p2p bridge\n");
-		bridge->flags |= BRIDGE_HAS_EJ0;
-		bridge->func = acpiphp_bridge_handle_to_function(handle);
+	/* must be added to the list prior to calling register_slot */
+	mutex_lock(&bridge_mutex);
+	list_add(&bridge->list, &bridge_list);
+	mutex_unlock(&bridge_mutex);
+
+	/* register all slot objects under this bridge */
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, 1,
+				     register_slot, NULL, bridge, NULL);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_err(bridge->handle, "failed to register slots\n");
+		goto err;
 	}
 
-	init_bridge_misc(bridge);
+	if (pci_is_root_bus(bridge->pci_bus))
+		return;
+
+	/* install notify handler for P2P bridges */
+	status = acpi_install_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY,
+					     handle_hotplug_event_bridge,
+					     bridge);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_err(bridge->handle,
+				"failed to register notify handler\n");
+		goto err;
+	}
+
+	if (!acpi_has_method(bridge->handle, "_EJ0"))
+		return;
+
+	dbg("found ejectable p2p bridge\n");
+	bridge->flags |= BRIDGE_HAS_EJ0;
+	bridge->func = acpiphp_bridge_handle_to_function(bridge->handle);
+	if (bridge->func) {
+		status = acpi_remove_notify_handler(bridge->func->handle,
+						    ACPI_SYSTEM_NOTIFY,
+						    handle_hotplug_event_func);
+		if (ACPI_FAILURE(status))
+			acpi_handle_err(bridge->func->handle,
+					"failed to remove notify handler\n");
+	}
+	return;
+
+ err:
+	cleanup_bridge(bridge);
+	put_bridge(bridge);
 }
 
 /* Destroy hotplug slots associated with the PCI bus */