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 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -758,6 +758,12 @@ add_dev:
 
        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 (file)
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -54,6 +54,10 @@ void pci_remove_bus(struct pci_bus *bus)
        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 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -578,6 +578,8 @@ static inline int pcibios_err_to_errno(int err)
 /* 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);