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authorYinghai Lu <yinghai@kernel.org>2012-09-19 11:54:20 -0700
committerBjorn Helgaas <bhelgaas@google.com>2012-09-20 17:37:23 -0600
commit3891b6acb4f443cbe2e99367ee5e67c6bc29d446 (patch)
tree31f19d4d3ca748c526e0bb82a670613c6c71ca40
parent94bb346480f8646871e5547491b5746ae0a643c3 (diff)
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>
-rw-r--r--drivers/pci/remove.c51
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);