[PATCH v10 19/59] PCI: Separate realloc list checking after allocation

[Yinghai Lu]

We check the realloc list, as list must be empty after allocation.

Separate the realloc list checking to another function.

Add checking that is missed in acpiphp driver.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
---
 drivers/pci/hotplug/acpiphp_glue.c |  1 +
 drivers/pci/pci.h                  |  1 +
 drivers/pci/setup-bus.c            | 12 +++++++++---
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index fa49f91..c35983a 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -507,6 +507,7 @@ static void enable_slot(struct acpiphp_slot *slot)
 		}
 	}
 	__pci_bus_assign_resources(bus, &add_list, NULL);
+	pci_bus_check_realloc(&add_list);
 
 	acpiphp_sanitize_bus(bus);
 	pcie_bus_configure_settings(bus);
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 60d1c87..510378d 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -238,6 +238,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus,
 void __pci_bus_assign_resources(const struct pci_bus *bus,
 				struct list_head *realloc_head,
 				struct list_head *fail_head);
+void pci_bus_check_realloc(struct list_head *realloc_head);
 bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
 
 void pci_reassigndev_resource_alignment(struct pci_dev *dev);
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index f9cd04a..4741cc9 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -280,6 +280,12 @@ out:
 	}
 }
 
+void pci_bus_check_realloc(struct list_head *realloc_head)
+{
+	if (WARN_ON(!list_empty(realloc_head)))
+		free_list(realloc_head);
+}
+
 /**
  * assign_requested_resources_sorted() - satisfy resource requests
  *
@@ -1777,7 +1783,7 @@ again:
 	/* Depth last, allocate resources and update the hardware. */
 	__pci_bus_assign_resources(bus, add_list, &fail_head);
 	if (add_list)
-		BUG_ON(!list_empty(add_list));
+		pci_bus_check_realloc(add_list);
 	tried_times++;
 
 	/* any device complain? */
@@ -1852,7 +1858,7 @@ void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
 again:
 	__pci_bus_size_bridges(parent, &add_list);
 	__pci_bridge_assign_resources(bridge, &add_list, &fail_head);
-	BUG_ON(!list_empty(&add_list));
+	pci_bus_check_realloc(&add_list);
 	tried_times++;
 
 	if (list_empty(&fail_head))
@@ -1911,6 +1917,6 @@ void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
 							 &add_list);
 	up_read(&pci_bus_sem);
 	__pci_bus_assign_resources(bus, &add_list, NULL);
-	BUG_ON(!list_empty(&add_list));
+	pci_bus_check_realloc(&add_list);
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bus_resources);
-- 
1.8.4.5