PCI: Assign resources before drivers claim devices (pci_scan_root_bus())

Previously, pci_scan_root_bus() created a root PCI bus, enumerated the
devices on it, and called pci_bus_add_devices(), which made the devices
available for drivers to claim them.

Most callers assigned resources to devices after pci_scan_root_bus()
returns, which may be after drivers have claimed the devices.  This is
incorrect; the PCI core should not change device resources while a driver
is managing the device.

Remove pci_bus_add_devices() from pci_scan_root_bus() and do it after any
resource assignment in the callers.

Note that ARM's pci_common_init_dev() already called pci_bus_add_devices()
after pci_scan_root_bus(), so we only need to remove the first call:

  pci_common_init_dev
    pcibios_init_hw
      pci_scan_root_bus
        pci_bus_add_devices        # first call
    pci_bus_assign_resources
    pci_bus_add_devices            # second call

[bhelgaas: changelog, drop "root_bus" var in alpha common_init_pci(),
return failure earlier in mn10300, add "return" in x86 pcibios_scan_root(),
return early if xtensa platform_pcibios_fixup() fails]
Signed-off-by: Yijing Wang <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
CC: Richard Henderson <[email protected]>
CC: Ivan Kokshaysky <[email protected]>
CC: Matt Turner <[email protected]>
CC: David Howells <[email protected]>
CC: Tony Luck <[email protected]>
CC: Michal Simek <[email protected]>
CC: Ralf Baechle <[email protected]>
CC: Koichi Yasutake <[email protected]>
CC: Sebastian Ott <[email protected]>
CC: "David S. Miller" <[email protected]>
CC: Chris Metcalf <[email protected]>
CC: Chris Zankel <[email protected]>
CC: Max Filippov <[email protected]>
CC: Thomas Gleixner <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c
index 899b7203a4e4..297107679fdf 100644
--- a/arch/sparc/kernel/leon_pci.c
+++ b/arch/sparc/kernel/leon_pci.c
@@ -40,6 +40,7 @@ void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
 
 		/* Assign devices with resources */
 		pci_assign_unassigned_resources();
+		pci_bus_add_devices(root_bus);
 	} else {
 		pci_free_resource_list(&resources);
 	}