PCI: Delay final fixups until resources are assigned

Commit 4f535093cf "PCI: Put pci_dev in device tree as early as possible"
moved final fixups from pci_bus_add_device() to pci_device_add().  But
pci_device_add() happens before resource assignment, so BARs may not be
valid yet.

Typical flow for hot-add:

    pciehp_configure_device
      pci_scan_slot
        pci_scan_single_device
          pci_device_add
            pci_fixup_device(pci_fixup_final, dev)  # previous location
      # resource assignment happens here
      pci_bus_add_devices
        pci_bus_add_device
          pci_fixup_device(pci_fixup_final, dev)    # new location

[bhelgaas: changelog, move fixups to pci_bus_add_device()]
Reference: https://lkml.kernel.org/r/20130415182614.GB9224@xanatos
Reported-by: David Bulkow <David.Bulkow@stratus.com>
Tested-by: David Bulkow <David.Bulkow@stratus.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.9+

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 748f8f3..32e66a6 100644 (file)
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -174,6 +174,7 @@ int pci_bus_add_device(struct pci_dev *dev)
         * Can not put in pci_device_add yet because resources
         * are not assigned yet for some devices.
         */
+       pci_fixup_device(pci_fixup_final, dev);
        pci_create_sysfs_dev_files(dev);
 
        dev->match_driver = true;

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 43ece5d..67cd045 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1341,7 +1341,6 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
        list_add_tail(&dev->bus_list, &bus->devices);
        up_write(&pci_bus_sem);
 
-       pci_fixup_device(pci_fixup_final, dev);
        ret = pcibios_add_device(dev);
        WARN_ON(ret < 0);