PCI: Add pci_ops.{add,remove}_bus() callbacks
Add pci_ops.{add,remove}_bus() callbacks, which will be called on every
newly created bus and when a bus is being removed, respectively. This can
be used by drivers to implement driver-specific initialization and teardown
of the bus, in addition to the architecture-specifics implemented by the
pcibios_add_bus() and the pcibios_remove_bus() functions.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6d7ab9b..3ea4de1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -758,6 +758,12 @@
pcibios_add_bus(child);
+ if (child->ops->add_bus) {
+ ret = child->ops->add_bus(child);
+ if (WARN_ON(ret < 0))
+ dev_err(&child->dev, "failed to add bus: %d\n", ret);
+ }
+
/* Create legacy_io and legacy_mem files for this bus */
pci_create_legacy_files(child);
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 8a280e9..d35c7fc 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -54,6 +54,10 @@
pci_bus_release_busn_res(bus);
up_write(&pci_bus_sem);
pci_remove_legacy_files(bus);
+
+ if (bus->ops->remove_bus)
+ bus->ops->remove_bus(bus);
+
pcibios_remove_bus(bus);
device_unregister(&bus->dev);
}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 27df4a6..0f7ef14 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -578,6 +578,8 @@
/* Low-level architecture-dependent routines */
struct pci_ops {
+ int (*add_bus)(struct pci_bus *bus);
+ void (*remove_bus)(struct pci_bus *bus);
void __iomem *(*map_bus)(struct pci_bus *bus, unsigned int devfn, int where);
int (*read)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val);
int (*write)(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val);