PCI: Stop all children first, before removing all children

This restores the previous behavior of stopping all child devices before
removing any of them.  The current SR-IOV design, where removing the PF
also drops references on all the VFs, depends on having the VFs continue
to exist after having been stopped.

[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 35 insertions, 16 deletions

diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 4f9ca9162895..513972f3ed13 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -56,25 +56,13 @@ void pci_remove_bus(struct pci_bus *bus)
 }
 EXPORT_SYMBOL(pci_remove_bus);
 
-/**
- * pci_stop_and_remove_bus_device - remove a PCI device and any children
- * @dev: the device to remove
- *
- * Remove a PCI device from the device lists, informing the drivers
- * that the device has been removed.  We also remove any subordinate
- * buses and children in a depth-first manner.
- *
- * For each device we remove, delete the device structure from the
- * device lists, remove the /proc entry, and notify userspace
- * (/sbin/hotplug).
- */
-void pci_stop_and_remove_bus_device(struct pci_dev *dev)
+static void pci_stop_bus_device(struct pci_dev *dev)
 {
         struct pci_bus *bus = dev->subordinate;
         struct pci_dev *child, *tmp;
 
         /*
-         * Removing an SR-IOV PF device removes all the associated VFs,
+         * Stopping an SR-IOV PF device removes all the associated VFs,
          * which will update the bus->devices list and confuse the
          * iterator.  Therefore, iterate in reverse so we remove the VFs
          * first, then the PF.
@@ -82,13 +70,44 @@ void pci_stop_and_remove_bus_device(struct pci_dev *dev)
         if (bus) {
                 list_for_each_entry_safe_reverse(child, tmp,
                                                  &bus->devices, bus_list)
-                        pci_stop_and_remove_bus_device(child);
+                        pci_stop_bus_device(child);
+        }
+
+        pci_stop_dev(dev);
+}
+
+static void pci_remove_bus_device(struct pci_dev *dev)
+{
+        struct pci_bus *bus = dev->subordinate;
+        struct pci_dev *child, *tmp;
+
+        if (bus) {
+                list_for_each_entry_safe(child, tmp,
+                                         &bus->devices, bus_list)
+                        pci_remove_bus_device(child);
 
                 pci_remove_bus(bus);
                 dev->subordinate = NULL;
         }
 
-        pci_stop_dev(dev);
         pci_destroy_dev(dev);
 }
+
+/**
+ * pci_stop_and_remove_bus_device - remove a PCI device and any children
+ * @dev: the device to remove
+ *
+ * Remove a PCI device from the device lists, informing the drivers
+ * that the device has been removed.  We also remove any subordinate
+ * buses and children in a depth-first manner.
+ *
+ * For each device we remove, delete the device structure from the
+ * device lists, remove the /proc entry, and notify userspace
+ * (/sbin/hotplug).
+ */
+void pci_stop_and_remove_bus_device(struct pci_dev *dev)
+{
+        pci_stop_bus_device(dev);
+        pci_remove_bus_device(dev);
+}
 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);