PCI/portdrv: Remove pcie_port_bus_type link order dependency

The pcie_port_bus_type must be registered before drivers that depend on it
can be registered.  Those drivers include:

  pcied_init()                # PCIe native hotplug driver
  aer_service_init()          # AER driver
  dpc_service_init()          # DPC driver
  pcie_pme_service_init()     # PME driver

Previously we registered pcie_port_bus_type from pcie_portdrv_init(), a
device_initcall.  The callers of pcie_port_service_register() (above) are
also device_initcalls.  This is fragile because the device_initcall
ordering depends on link order, which is not explicit.

Register pcie_port_bus_type from pci_driver_init() along with pci_bus_type.
This removes the link order dependency between portdrv and the pciehp, AER,
DPC, and PCIe PME drivers.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 0 insertions, 55 deletions

diff --git a/drivers/pci/pcie/portdrv_bus.c b/drivers/pci/pcie/portdrv_bus.c
deleted file mode 100644
index 4969ccf..0000000
--- a/drivers/pci/pcie/portdrv_bus.c
+++ /dev/null
@@ -1,55 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * File:	portdrv_bus.c
- * Purpose:	PCI Express Port Bus Driver's Bus Overloading Functions
- *
- * Copyright (C) 2004 Intel
- * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
- */
-
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/pm.h>
-
-#include "portdrv.h"
-
-static int pcie_port_bus_match(struct device *dev, struct device_driver *drv);
-
-struct bus_type pcie_port_bus_type = {
-	.name		= "pci_express",
-	.match		= pcie_port_bus_match,
-};
-EXPORT_SYMBOL_GPL(pcie_port_bus_type);
-
-static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
-{
-	struct pcie_device *pciedev;
-	struct pcie_port_service_driver *driver;
-
-	if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
-		return 0;
-
-	pciedev = to_pcie_device(dev);
-	driver = to_service_driver(drv);
-
-	if (driver->service != pciedev->service)
-		return 0;
-
-	if ((driver->port_type != PCIE_ANY_PORT) &&
-	    (driver->port_type != pci_pcie_type(pciedev->port)))
-		return 0;
-
-	return 1;
-}
-
-int pcie_port_bus_register(void)
-{
-	return bus_register(&pcie_port_bus_type);
-}
-
-void pcie_port_bus_unregister(void)
-{
-	bus_unregister(&pcie_port_bus_type);
-}