[PATCH part1 4/4] PCI: Split out stop_bus_device and remove_bus_dev again.

Yinghai Lu
2012-09-02T21:47:38Z

So add back some functions that are needed for pci root bus hotplug support.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/remove.c | 77 +++++++++++++++++++++++++++++++++++++++----------
include/linux/pci.h | 2 +
2 files changed, 63 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 4f9ca91..aaae16e 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 +70,70 @@ 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);
+
+void pci_stop_bus_devices(struct pci_bus *bus)
+{
+ struct pci_dev *child, *tmp;
+
+ list_for_each_entry_safe_reverse(child, tmp,
+ &bus->devices, bus_list)
+ pci_stop_bus_device(child);
+}
+
+static void pci_remove_bus_devices(struct pci_bus *bus)
+{
+ struct pci_dev *child, *tmp;
+
+ list_for_each_entry_safe(child, tmp,
+ &bus->devices, bus_list)
+ pci_remove_bus_device(child);
+}
+
+void pci_stop_and_remove_behind_bridge(struct pci_dev *dev)
+{
+ pci_stop_bus_device(dev);
+
+ if (dev->subordinate)
+ pci_remove_bus_devices(dev->subordinate);
+}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0d87189..1b460e1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -734,6 +734,8 @@ extern struct pci_dev *pci_dev_get(struct pci_dev *dev);
extern void pci_dev_put(struct pci_dev *dev);
extern void pci_remove_bus(struct pci_bus *b);
extern void pci_stop_and_remove_bus_device(struct pci_dev *dev);
+void pci_stop_bus_devices(struct pci_bus *bus);
+void pci_stop_and_remove_behind_bridge(struct pci_dev *dev);
void pci_setup_cardbus(struct pci_bus *bus);
extern void pci_sort_breadthfirst(void);
#define dev_is_pci(d) ((d)->bus == &pci_bus_type)
--
1.7.7