linux-kernel - [ 70/73] PCI: Delay final fixups until resources are assigned

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Date:	Thu,  9 May 2013 15:26:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, David Bulkow <David.Bulkow@...atus.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [ 70/73] PCI: Delay final fixups until resources are assigned

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yinghai Lu <yinghai@...nel.org>

commit e253aaf0af51c1e4dc7dd3b26ea8e666bf9a2d8d upstream.

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@...atus.com>
Tested-by: David Bulkow <David.Bulkow@...atus.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/bus.c   |    1 +
 drivers/pci/probe.c |    1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -174,6 +174,7 @@ int pci_bus_add_device(struct pci_dev *d
 	 * 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;
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1339,7 +1339,6 @@ void pci_device_add(struct pci_dev *dev,
 	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);
 


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