Driver core: add bus_sort_breadthfirst() function

The PCI core wants to reorder the devices in the bus list.  So move this
functionality out of the pci core and into the driver core so that
anyone else can also do this if needed.  This also lets us change how
struct device is attached to drivers in the future without messing with
the PCI core.

Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 45 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 36698e57b97f..dd9161a054e1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1237,8 +1237,11 @@ EXPORT_SYMBOL(pci_scan_bridge);
 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
 #endif
 
-static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev *b)
+static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
 {
+	const struct pci_dev *a = to_pci_dev(d_a);
+	const struct pci_dev *b = to_pci_dev(d_b);
+
 	if      (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
 	else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return  1;
 
@@ -1251,50 +1254,7 @@ static int __init pci_sort_bf_cmp(const struct pci_dev *a, const struct pci_dev
 	return 0;
 }
 
-/*
- * Yes, this forcably breaks the klist abstraction temporarily.  It
- * just wants to sort the klist, not change reference counts and
- * take/drop locks rapidly in the process.  It does all this while
- * holding the lock for the list, so objects can't otherwise be
- * added/removed while we're swizzling.
- */
-static void __init pci_insertion_sort_klist(struct pci_dev *a, struct list_head *list)
-{
-	struct list_head *pos;
-	struct klist_node *n;
-	struct device *dev;
-	struct pci_dev *b;
-
-	list_for_each(pos, list) {
-		n = container_of(pos, struct klist_node, n_node);
-		dev = container_of(n, struct device, knode_bus);
-		b = to_pci_dev(dev);
-		if (pci_sort_bf_cmp(a, b) <= 0) {
-			list_move_tail(&a->dev.knode_bus.n_node, &b->dev.knode_bus.n_node);
-			return;
-		}
-	}
-	list_move_tail(&a->dev.knode_bus.n_node, list);
-}
-
 void __init pci_sort_breadthfirst(void)
 {
-	LIST_HEAD(sorted_devices);
-	struct list_head *pos, *tmp;
-	struct klist_node *n;
-	struct device *dev;
-	struct pci_dev *pdev;
-	struct klist *device_klist;
-
-	device_klist = bus_get_device_klist(&pci_bus_type);
-
-	spin_lock(&device_klist->k_lock);
-	list_for_each_safe(pos, tmp, &device_klist->k_list) {
-		n = container_of(pos, struct klist_node, n_node);
-		dev = container_of(n, struct device, knode_bus);
-		pdev = to_pci_dev(dev);
-		pci_insertion_sort_klist(pdev, &sorted_devices);
-	}
-	list_splice(&sorted_devices, &device_klist->k_list);
-	spin_unlock(&device_klist->k_lock);
+	bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);
 }