Commit e253aaf0 authored May 07, 2013 by Yinghai Lu Committed by Bjorn Helgaas May 07, 2013

PCI: Delay final fixups until resources are assigned

Commit 4f535093 "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+

parent dd72be99

drivers/pci/bus.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;

drivers/pci/probe.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -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);