Merge tag 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI update from Bjorn Helgaas:
 "Host bridge hotplug:
   - Untangle _PRT from struct pci_bus (Bjorn Helgaas)
   - Request _OSC control before scanning root bus (Taku Izumi)
   - Assign resources when adding host bridge (Yinghai Lu)
   - Remove root bus when removing host bridge (Yinghai Lu)
   - Remove _PRT during hot remove (Yinghai Lu)

  SRIOV
    - Add sysfs knobs to control numVFs (Don Dutile)

  Power management
   - Notify devices when power resource turned on (Huang Ying)

  Bug fixes
   - Work around broken _SEG on HP xw9300 (Bjorn Helgaas)
   - Keep runtime PM enabled for unbound PCI devices (Huang Ying)
   - Fix Optimus dual-GPU runtime D3 suspend issue (Dave Airlie)
   - Fix xen frontend shutdown issue (David Vrabel)
   - Work around PLX PCI 9050 BAR alignment erratum (Ian Abbott)

  Miscellaneous
   - Add GPL license for drivers/pci/ioapic (Andrew Cooks)
   - Add standard PCI-X, PCIe ASPM register #defines (Bjorn Helgaas)
   - NumaChip remote PCI support (Daniel Blueman)
   - Fix PCIe Link Capabilities Supported Link Speed definition (Jingoo
     Han)
   - Convert dev_printk() to dev_info(), etc (Joe Perches)
   - Add support for non PCI BAR ROM data (Matthew Garrett)
   - Add x86 support for host bridge translation offset (Mike Yoknis)
   - Report success only when every driver supports AER (Vijay
     Pandarathil)"

Fix up trivial conflicts.

* tag 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (48 commits)
  PCI: Use phys_addr_t for physical ROM address
  x86/PCI: Add NumaChip remote PCI support
  ath9k: Use standard #defines for PCIe Capability ASPM fields
  iwlwifi: Use standard #defines for PCIe Capability ASPM fields
  iwlwifi: collapse wrapper for pcie_capability_read_word()
  iwlegacy: Use standard #defines for PCIe Capability ASPM fields
  iwlegacy: collapse wrapper for pcie_capability_read_word()
  cxgb3: Use standard #defines for PCIe Capability ASPM fields
  PCI: Add standard PCIe Capability Link ASPM field names
  PCI/portdrv: Use PCI Express Capability accessors
  PCI: Use standard PCIe Capability Link register field names
  x86: Use PCI setup data
  PCI: Add support for non-BAR ROMs
  PCI: Add pcibios_add_device
  EFI: Stash ROMs if they're not in the PCI BAR
  PCI: Add and use standard PCI-X Capability register names
  PCI/PM: Keep runtime PM enabled for unbound PCI devices
  xen-pcifront: Handle backend CLOSED without CLOSING
  PCI: SRIOV control and status via sysfs (documentation)
  PCI/AER: Report success only when every device has AER-aware driver
  ...

19 files changed, 479 insertions, 131 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index a543746fb354..ad6a8b635692 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -170,6 +170,11 @@ int pci_bus_add_device(struct pci_dev *dev)
 	int retval;
 
 	pci_fixup_device(pci_fixup_final, dev);
+
+	retval = pcibios_add_device(dev);
+	if (retval)
+		return retval;
+
 	retval = device_add(&dev->dev);
 	if (retval)
 		return retval;
diff --git a/drivers/pci/ioapic.c b/drivers/pci/ioapic.c
index 2eca902a4283..3c6bbdd059a4 100644
--- a/drivers/pci/ioapic.c
+++ b/drivers/pci/ioapic.c
@@ -125,3 +125,5 @@ static void __exit ioapic_exit(void)
 
 module_init(ioapic_init);
 module_exit(ioapic_exit);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index aeccc911abb8..bafd2bbcaf65 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -106,7 +106,7 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
 		virtfn->resource[i].name = pci_name(virtfn);
 		virtfn->resource[i].flags = res->flags;
 		size = resource_size(res);
-		do_div(size, iov->total);
+		do_div(size, iov->total_VFs);
 		virtfn->resource[i].start = res->start + size * id;
 		virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
 		rc = request_resource(res, &virtfn->resource[i]);
@@ -194,7 +194,7 @@ static int sriov_migration(struct pci_dev *dev)
 	u16 status;
 	struct pci_sriov *iov = dev->sriov;
 
-	if (!iov->nr_virtfn)
+	if (!iov->num_VFs)
 		return 0;
 
 	if (!(iov->cap & PCI_SRIOV_CAP_VFM))
@@ -216,7 +216,7 @@ static void sriov_migration_task(struct work_struct *work)
 	u16 status;
 	struct pci_sriov *iov = container_of(work, struct pci_sriov, mtask);
 
-	for (i = iov->initial; i < iov->nr_virtfn; i++) {
+	for (i = iov->initial_VFs; i < iov->num_VFs; i++) {
 		state = readb(iov->mstate + i);
 		if (state == PCI_SRIOV_VFM_MI) {
 			writeb(PCI_SRIOV_VFM_AV, iov->mstate + i);
@@ -244,7 +244,7 @@ static int sriov_enable_migration(struct pci_dev *dev, int nr_virtfn)
 	resource_size_t pa;
 	struct pci_sriov *iov = dev->sriov;
 
-	if (nr_virtfn <= iov->initial)
+	if (nr_virtfn <= iov->initial_VFs)
 		return 0;
 
 	pci_read_config_dword(dev, iov->pos + PCI_SRIOV_VFM, &table);
@@ -294,15 +294,15 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 	if (!nr_virtfn)
 		return 0;
 
-	if (iov->nr_virtfn)
+	if (iov->num_VFs)
 		return -EINVAL;
 
 	pci_read_config_word(dev, iov->pos + PCI_SRIOV_INITIAL_VF, &initial);
-	if (initial > iov->total ||
-	    (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total)))
+	if (initial > iov->total_VFs ||
+	    (!(iov->cap & PCI_SRIOV_CAP_VFM) && (initial != iov->total_VFs)))
 		return -EIO;
 
-	if (nr_virtfn < 0 || nr_virtfn > iov->total ||
+	if (nr_virtfn < 0 || nr_virtfn > iov->total_VFs ||
 	    (!(iov->cap & PCI_SRIOV_CAP_VFM) && (nr_virtfn > initial)))
 		return -EINVAL;
 
@@ -359,7 +359,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 	msleep(100);
 	pci_cfg_access_unlock(dev);
 
-	iov->initial = initial;
+	iov->initial_VFs = initial;
 	if (nr_virtfn < initial)
 		initial = nr_virtfn;
 
@@ -376,7 +376,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
 	}
 
 	kobject_uevent(&dev->dev.kobj, KOBJ_CHANGE);
-	iov->nr_virtfn = nr_virtfn;
+	iov->num_VFs = nr_virtfn;
 
 	return 0;
 
@@ -401,13 +401,13 @@ static void sriov_disable(struct pci_dev *dev)
 	int i;
 	struct pci_sriov *iov = dev->sriov;
 
-	if (!iov->nr_virtfn)
+	if (!iov->num_VFs)
 		return;
 
 	if (iov->cap & PCI_SRIOV_CAP_VFM)
 		sriov_disable_migration(dev);
 
-	for (i = 0; i < iov->nr_virtfn; i++)
+	for (i = 0; i < iov->num_VFs; i++)
 		virtfn_remove(dev, i, 0);
 
 	iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE);
@@ -419,7 +419,7 @@ static void sriov_disable(struct pci_dev *dev)
 	if (iov->link != dev->devfn)
 		sysfs_remove_link(&dev->dev.kobj, "dep_link");
 
-	iov->nr_virtfn = 0;
+	iov->num_VFs = 0;
 }
 
 static int sriov_init(struct pci_dev *dev, int pos)
@@ -496,7 +496,7 @@ found:
 	iov->pos = pos;
 	iov->nres = nres;
 	iov->ctrl = ctrl;
-	iov->total = total;
+	iov->total_VFs = total;
 	iov->offset = offset;
 	iov->stride = stride;
 	iov->pgsz = pgsz;
@@ -529,7 +529,7 @@ failed:
 
 static void sriov_release(struct pci_dev *dev)
 {
-	BUG_ON(dev->sriov->nr_virtfn);
+	BUG_ON(dev->sriov->num_VFs);
 
 	if (dev != dev->sriov->dev)
 		pci_dev_put(dev->sriov->dev);
@@ -554,7 +554,7 @@ static void sriov_restore_state(struct pci_dev *dev)
 		pci_update_resource(dev, i);
 
 	pci_write_config_dword(dev, iov->pos + PCI_SRIOV_SYS_PGSIZE, iov->pgsz);
-	pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->nr_virtfn);
+	pci_write_config_word(dev, iov->pos + PCI_SRIOV_NUM_VF, iov->num_VFs);
 	pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl);
 	if (iov->ctrl & PCI_SRIOV_CTRL_VFE)
 		msleep(100);
@@ -661,7 +661,7 @@ int pci_iov_bus_range(struct pci_bus *bus)
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		if (!dev->is_physfn)
 			continue;
-		busnr = virtfn_bus(dev, dev->sriov->total - 1);
+		busnr = virtfn_bus(dev, dev->sriov->total_VFs - 1);
 		if (busnr > max)
 			max = busnr;
 	}
@@ -729,9 +729,56 @@ EXPORT_SYMBOL_GPL(pci_sriov_migration);
  */
 int pci_num_vf(struct pci_dev *dev)
 {
-	if (!dev || !dev->is_physfn)
+	if (!dev->is_physfn)
 		return 0;
-	else
-		return dev->sriov->nr_virtfn;
+
+	return dev->sriov->num_VFs;
 }
 EXPORT_SYMBOL_GPL(pci_num_vf);
+
+/**
+ * pci_sriov_set_totalvfs -- reduce the TotalVFs available
+ * @dev: the PCI PF device
+ * numvfs: number that should be used for TotalVFs supported
+ *
+ * Should be called from PF driver's probe routine with
+ * device's mutex held.
+ *
+ * Returns 0 if PF is an SRIOV-capable device and
+ * value of numvfs valid. If not a PF with VFS, return -EINVAL;
+ * if VFs already enabled, return -EBUSY.
+ */
+int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
+{
+	if (!dev->is_physfn || (numvfs > dev->sriov->total_VFs))
+		return -EINVAL;
+
+	/* Shouldn't change if VFs already enabled */
+	if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
+		return -EBUSY;
+	else
+		dev->sriov->driver_max_VFs = numvfs;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
+
+/**
+ * pci_sriov_get_totalvfs -- get total VFs supported on this devic3
+ * @dev: the PCI PF device
+ *
+ * For a PCIe device with SRIOV support, return the PCIe
+ * SRIOV capability value of TotalVFs or the value of driver_max_VFs
+ * if the driver reduced it.  Otherwise, -EINVAL.
+ */
+int pci_sriov_get_totalvfs(struct pci_dev *dev)
+{
+	if (!dev->is_physfn)
+		return -EINVAL;
+
+	if (dev->sriov->driver_max_VFs)
+		return dev->sriov->driver_max_VFs;
+
+	return dev->sriov->total_VFs;
+}
+EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
diff --git a/drivers/pci/irq.c b/drivers/pci/irq.c
index e5f69a43b1b1..b008cf86b9c3 100644
--- a/drivers/pci/irq.c
+++ b/drivers/pci/irq.c
@@ -14,11 +14,11 @@ static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason)
 {
 	struct pci_dev *parent = to_pci_dev(pdev->dev.parent);
 
-	dev_printk(KERN_ERR, &pdev->dev,
-		   "Potentially misrouted IRQ (Bridge %s %04x:%04x)\n",
-		   dev_name(&parent->dev), parent->vendor, parent->device);
-	dev_printk(KERN_ERR, &pdev->dev, "%s\n", reason);
-	dev_printk(KERN_ERR, &pdev->dev, "Please report to linux-kernel@vger.kernel.org\n");
+	dev_err(&pdev->dev,
+		"Potentially misrouted IRQ (Bridge %s %04x:%04x)\n",
+		dev_name(&parent->dev), parent->vendor, parent->device);
+	dev_err(&pdev->dev, "%s\n", reason);
+	dev_err(&pdev->dev, "Please report to linux-kernel@vger.kernel.org\n");
 	WARN_ON(1);
 }
 
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 1dc78c5cabf8..f79cbcd3944b 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -248,31 +248,26 @@ struct drv_dev_and_id {
 static long local_pci_probe(void *_ddi)
 {
 	struct drv_dev_and_id *ddi = _ddi;
-	struct device *dev = &ddi->dev->dev;
-	struct device *parent = dev->parent;
+	struct pci_dev *pci_dev = ddi->dev;
+	struct pci_driver *pci_drv = ddi->drv;
+	struct device *dev = &pci_dev->dev;
 	int rc;
 
-	/* The parent bridge must be in active state when probing */
-	if (parent)
-		pm_runtime_get_sync(parent);
-	/* Unbound PCI devices are always set to disabled and suspended.
-	 * During probe, the device is set to enabled and active and the
-	 * usage count is incremented.  If the driver supports runtime PM,
-	 * it should call pm_runtime_put_noidle() in its probe routine and
-	 * pm_runtime_get_noresume() in its remove routine.
+	/*
+	 * Unbound PCI devices are always put in D0, regardless of
+	 * runtime PM status.  During probe, the device is set to
+	 * active and the usage count is incremented.  If the driver
+	 * supports runtime PM, it should call pm_runtime_put_noidle()
+	 * in its probe routine and pm_runtime_get_noresume() in its
+	 * remove routine.
 	 */
-	pm_runtime_get_noresume(dev);
-	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
-
-	rc = ddi->drv->probe(ddi->dev, ddi->id);
+	pm_runtime_get_sync(dev);
+	pci_dev->driver = pci_drv;
+	rc = pci_drv->probe(pci_dev, ddi->id);
 	if (rc) {
-		pm_runtime_disable(dev);
-		pm_runtime_set_suspended(dev);
-		pm_runtime_put_noidle(dev);
+		pci_dev->driver = NULL;
+		pm_runtime_put_sync(dev);
 	}
-	if (parent)
-		pm_runtime_put(parent);
 	return rc;
 }
 
@@ -322,10 +317,8 @@ __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
 		id = pci_match_device(drv, pci_dev);
 		if (id)
 			error = pci_call_probe(drv, pci_dev, id);
-		if (error >= 0) {
-			pci_dev->driver = drv;
+		if (error >= 0)
 			error = 0;
-		}
 	}
 	return error;
 }
@@ -361,9 +354,7 @@ static int pci_device_remove(struct device * dev)
 	}
 
 	/* Undo the runtime PM settings in local_pci_probe() */
-	pm_runtime_disable(dev);
-	pm_runtime_set_suspended(dev);
-	pm_runtime_put_noidle(dev);
+	pm_runtime_put_sync(dev);
 
 	/*
 	 * If the device is still on, set the power state as "unknown",
@@ -986,6 +977,13 @@ static int pci_pm_runtime_suspend(struct device *dev)
 	pci_power_t prev = pci_dev->current_state;
 	int error;
 
+	/*
+	 * If pci_dev->driver is not set (unbound), the device should
+	 * always remain in D0 regardless of the runtime PM status
+	 */
+	if (!pci_dev->driver)
+		return 0;
+
 	if (!pm || !pm->runtime_suspend)
 		return -ENOSYS;
 
@@ -1007,10 +1005,10 @@ static int pci_pm_runtime_suspend(struct device *dev)
 		return 0;
 	}
 
-	if (!pci_dev->state_saved)
+	if (!pci_dev->state_saved) {
 		pci_save_state(pci_dev);
-
-	pci_finish_runtime_suspend(pci_dev);
+		pci_finish_runtime_suspend(pci_dev);
+	}
 
 	return 0;
 }
@@ -1021,6 +1019,13 @@ static int pci_pm_runtime_resume(struct device *dev)
 	struct pci_dev *pci_dev = to_pci_dev(dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
+	/*
+	 * If pci_dev->driver is not set (unbound), the device should
+	 * always remain in D0 regardless of the runtime PM status
+	 */
+	if (!pci_dev->driver)
+		return 0;
+
 	if (!pm || !pm->runtime_resume)
 		return -ENOSYS;
 
@@ -1038,8 +1043,16 @@ static int pci_pm_runtime_resume(struct device *dev)
 
 static int pci_pm_runtime_idle(struct device *dev)
 {
+	struct pci_dev *pci_dev = to_pci_dev(dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
+	/*
+	 * If pci_dev->driver is not set (unbound), the device should
+	 * always remain in D0 regardless of the runtime PM status
+	 */
+	if (!pci_dev->driver)
+		goto out;
+
 	if (!pm)
 		return -ENOSYS;
 
@@ -1049,8 +1062,8 @@ static int pci_pm_runtime_idle(struct device *dev)
 			return ret;
 	}
 
+out:
 	pm_runtime_suspend(dev);
-
 	return 0;
 }
 
diff --git a/drivers/pci/pci-stub.c b/drivers/pci/pci-stub.c
index 775e933c2225..6e47c519c510 100644
--- a/drivers/pci/pci-stub.c
+++ b/drivers/pci/pci-stub.c
@@ -28,7 +28,7 @@ MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the stub driver, format is "
 
 static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
-	dev_printk(KERN_INFO, &dev->dev, "claimed by stub\n");
+	dev_info(&dev->dev, "claimed by stub\n");
 	return 0;
 }
 
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 68d56f02e721..05b78b16d20b 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -401,6 +401,106 @@ static ssize_t d3cold_allowed_show(struct device *dev,
 }
 #endif
 
+#ifdef CONFIG_PCI_IOV
+static ssize_t sriov_totalvfs_show(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
+}
+
+
+static ssize_t sriov_numvfs_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
+}
+
+/*
+ * num_vfs > 0; number of vfs to enable
+ * num_vfs = 0; disable all vfs
+ *
+ * Note: SRIOV spec doesn't allow partial VF
+ *       disable, so its all or none.
+ */
+static ssize_t sriov_numvfs_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int num_vfs_enabled = 0;
+	int num_vfs;
+	int ret = 0;
+	u16 total;
+
+	if (kstrtoint(buf, 0, &num_vfs) < 0)
+		return -EINVAL;
+
+	/* is PF driver loaded w/callback */
+	if (!pdev->driver || !pdev->driver->sriov_configure) {
+		dev_info(&pdev->dev,
+			 "Driver doesn't support SRIOV configuration via sysfs\n");
+		return -ENOSYS;
+	}
+
+	/* if enabling vf's ... */
+	total = pci_sriov_get_totalvfs(pdev);
+	/* Requested VFs to enable < totalvfs and none enabled already */
+	if ((num_vfs > 0) && (num_vfs <= total)) {
+		if (pdev->sriov->num_VFs == 0) {
+			num_vfs_enabled =
+				pdev->driver->sriov_configure(pdev, num_vfs);
+			if ((num_vfs_enabled >= 0) &&
+			    (num_vfs_enabled != num_vfs)) {
+				dev_warn(&pdev->dev,
+					 "Only %d VFs enabled\n",
+					 num_vfs_enabled);
+				return count;
+			} else if (num_vfs_enabled < 0)
+				/* error code from driver callback */
+				return num_vfs_enabled;
+		} else if (num_vfs == pdev->sriov->num_VFs) {
+			dev_warn(&pdev->dev,
+				 "%d VFs already enabled; no enable action taken\n",
+				 num_vfs);
+			return count;
+		} else {
+			dev_warn(&pdev->dev,
+				 "%d VFs already enabled. Disable before enabling %d VFs\n",
+				 pdev->sriov->num_VFs, num_vfs);
+			return -EINVAL;
+		}
+	}
+
+	/* disable vfs */
+	if (num_vfs == 0) {
+		if (pdev->sriov->num_VFs != 0) {
+			ret = pdev->driver->sriov_configure(pdev, 0);
+			return ret ? ret : count;
+		} else {
+			dev_warn(&pdev->dev,
+				 "All VFs disabled; no disable action taken\n");
+			return count;
+		}
+	}
+
+	dev_err(&pdev->dev,
+		"Invalid value for number of VFs to enable: %d\n", num_vfs);
+
+	return -EINVAL;
+}
+
+static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
+static struct device_attribute sriov_numvfs_attr =
+		__ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
+		       sriov_numvfs_show, sriov_numvfs_store);
+#endif /* CONFIG_PCI_IOV */
+
 struct device_attribute pci_dev_attrs[] = {
 	__ATTR_RO(resource),
 	__ATTR_RO(vendor),
@@ -1262,29 +1362,20 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 		pdev->rom_attr = attr;
 	}
 
-	if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
-		retval = device_create_file(&pdev->dev, &vga_attr);
-		if (retval)
-			goto err_rom_file;
-	}
-
 	/* add platform-specific attributes */
 	retval = pcibios_add_platform_entries(pdev);
 	if (retval)
-		goto err_vga_file;
+		goto err_rom_file;
 
 	/* add sysfs entries for various capabilities */
 	retval = pci_create_capabilities_sysfs(pdev);
 	if (retval)
-		goto err_vga_file;
+		goto err_rom_file;
 
 	pci_create_firmware_label_files(pdev);
 
 	return 0;
 
-err_vga_file:
-	if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
-		device_remove_file(&pdev->dev, &vga_attr);
 err_rom_file:
 	if (rom_size) {
 		sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
@@ -1370,3 +1461,62 @@ static int __init pci_sysfs_init(void)
 }
 
 late_initcall(pci_sysfs_init);
+
+static struct attribute *pci_dev_dev_attrs[] = {
+	&vga_attr.attr,
+	NULL,
+};
+
+static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
+						struct attribute *a, int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	if (a == &vga_attr.attr)
+		if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+			return 0;
+
+	return a->mode;
+}
+
+#ifdef CONFIG_PCI_IOV
+static struct attribute *sriov_dev_attrs[] = {
+	&sriov_totalvfs_attr.attr,
+	&sriov_numvfs_attr.attr,
+	NULL,
+};
+
+static umode_t sriov_attrs_are_visible(struct kobject *kobj,
+					 struct attribute *a, int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+
+	if (!dev_is_pf(dev))
+		return 0;
+
+	return a->mode;
+}
+
+static struct attribute_group sriov_dev_attr_group = {
+	.attrs = sriov_dev_attrs,
+	.is_visible = sriov_attrs_are_visible,
+};
+#endif /* CONFIG_PCI_IOV */
+
+static struct attribute_group pci_dev_attr_group = {
+	.attrs = pci_dev_dev_attrs,
+	.is_visible = pci_dev_attrs_are_visible,
+};
+
+static const struct attribute_group *pci_dev_attr_groups[] = {
+	&pci_dev_attr_group,
+#ifdef CONFIG_PCI_IOV
+	&sriov_dev_attr_group,
+#endif
+	NULL,
+};
+
+struct device_type pci_dev_type = {
+	.groups = pci_dev_attr_groups,
+};
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index bdf66b500f22..5cb5820fae40 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1333,6 +1333,19 @@ void pcim_pin_device(struct pci_dev *pdev)
 		dr->pinned = 1;
 }
 
+/*
+ * pcibios_add_device - provide arch specific hooks when adding device dev
+ * @dev: the PCI device being added
+ *
+ * Permits the platform to provide architecture specific functionality when
+ * devices are added. This is the default implementation. Architecture
+ * implementations can override this.
+ */
+int __weak pcibios_add_device (struct pci_dev *dev)
+{
+	return 0;
+}
+
 /**
  * pcibios_disable_device - disable arch specific PCI resources for device dev
  * @dev: the PCI device to disable
@@ -1578,15 +1591,25 @@ void pci_pme_active(struct pci_dev *dev, bool enable)
 
 	pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
 
-	/* PCI (as opposed to PCIe) PME requires that the device have
-	   its PME# line hooked up correctly. Not all hardware vendors
-	   do this, so the PME never gets delivered and the device
-	   remains asleep. The easiest way around this is to
-	   periodically walk the list of suspended devices and check
-	   whether any have their PME flag set. The assumption is that
-	   we'll wake up often enough anyway that this won't be a huge
-	   hit, and the power savings from the devices will still be a
-	   win. */
+	/*
+	 * PCI (as opposed to PCIe) PME requires that the device have
+	 * its PME# line hooked up correctly. Not all hardware vendors
+	 * do this, so the PME never gets delivered and the device
+	 * remains asleep. The easiest way around this is to
+	 * periodically walk the list of suspended devices and check
+	 * whether any have their PME flag set. The assumption is that
+	 * we'll wake up often enough anyway that this won't be a huge
+	 * hit, and the power savings from the devices will still be a
+	 * win.
+	 *
+	 * Although PCIe uses in-band PME message instead of PME# line
+	 * to report PME, PME does not work for some PCIe devices in
+	 * reality.  For example, there are devices that set their PME
+	 * status bits, but don't really bother to send a PME message;
+	 * there are PCI Express Root Ports that don't bother to
+	 * trigger interrupts when they receive PME messages from the
+	 * devices below.  So PME poll is used for PCIe devices too.
+	 */
 
 	if (dev->pme_poll) {
 		struct pci_pme_device *pme_dev;
@@ -1900,6 +1923,8 @@ void pci_pm_init(struct pci_dev *dev)
 	u16 pmc;
 
 	pm_runtime_forbid(&dev->dev);
+	pm_runtime_set_active(&dev->dev);
+	pm_runtime_enable(&dev->dev);
 	device_enable_async_suspend(&dev->dev);
 	dev->wakeup_prepared = false;
 
@@ -3865,14 +3890,13 @@ static void pci_no_domains(void)
 }
 
 /**
- * pci_ext_cfg_enabled - can we access extended PCI config space?
- * @dev: The PCI device of the root bridge.
+ * pci_ext_cfg_avail - can we access extended PCI config space?
  *
  * Returns 1 if we can access PCI extended config space (offsets
  * greater than 0xff). This is the default implementation. Architecture
  * implementations can override this.
  */
-int __weak pci_ext_cfg_avail(struct pci_dev *dev)
+int __weak pci_ext_cfg_avail(void)
 {
 	return 1;
 }
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index e253881c4275..e8518292826f 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -158,6 +158,7 @@ static inline int pci_no_d1d2(struct pci_dev *dev)
 }
 extern struct device_attribute pci_dev_attrs[];
 extern struct device_attribute pcibus_dev_attrs[];
+extern struct device_type pci_dev_type;
 extern struct bus_attribute pci_bus_attrs[];
 
 
@@ -229,13 +230,14 @@ struct pci_sriov {
 	int nres;		/* number of resources */
 	u32 cap;		/* SR-IOV Capabilities */
 	u16 ctrl;		/* SR-IOV Control */
-	u16 total;		/* total VFs associated with the PF */
-	u16 initial;		/* initial VFs associated with the PF */
-	u16 nr_virtfn;		/* number of VFs available */
+	u16 total_VFs;		/* total VFs associated with the PF */
+	u16 initial_VFs;	/* initial VFs associated with the PF */
+	u16 num_VFs;		/* number of VFs available */
 	u16 offset;		/* first VF Routing ID offset */
 	u16 stride;		/* following VF stride */
 	u32 pgsz;		/* page size for BAR alignment */
 	u8 link;		/* Function Dependency Link */
+	u16 driver_max_VFs;	/* max num VFs driver supports */
 	struct pci_dev *dev;	/* lowest numbered PF */
 	struct pci_dev *self;	/* this PF */
 	struct mutex lock;	/* lock for VF bus */
diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h
index 94a7598eb262..22f840f4dda1 100644
--- a/drivers/pci/pcie/aer/aerdrv.h
+++ b/drivers/pci/pcie/aer/aerdrv.h
@@ -87,6 +87,9 @@ struct aer_broadcast_data {
 static inline pci_ers_result_t merge_result(enum pci_ers_result orig,
 		enum pci_ers_result new)
 {
+	if (new == PCI_ERS_RESULT_NO_AER_DRIVER)
+		return PCI_ERS_RESULT_NO_AER_DRIVER;
+
 	if (new == PCI_ERS_RESULT_NONE)
 		return orig;
 
@@ -97,7 +100,7 @@ static inline pci_ers_result_t merge_result(enum pci_ers_result orig,
 		break;
 	case PCI_ERS_RESULT_DISCONNECT:
 		if (new == PCI_ERS_RESULT_NEED_RESET)
-			orig = new;
+			orig = PCI_ERS_RESULT_NEED_RESET;
 		break;
 	default:
 		break;
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index af4e31cd3a3b..421bbc5fee32 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -232,13 +232,27 @@ static int report_error_detected(struct pci_dev *dev, void *data)
 				   dev->driver ?
 				   "no AER-aware driver" : "no driver");
 		}
-		goto out;
+
+		/*
+		 * If there's any device in the subtree that does not
+		 * have an error_detected callback, returning
+		 * PCI_ERS_RESULT_NO_AER_DRIVER prevents calling of
+		 * the subsequent mmio_enabled/slot_reset/resume
+		 * callbacks of "any" device in the subtree. All the
+		 * devices in the subtree are left in the error state
+		 * without recovery.
+		 */
+
+		if (!(dev->hdr_type & PCI_HEADER_TYPE_BRIDGE))
+			vote = PCI_ERS_RESULT_NO_AER_DRIVER;
+		else
+			vote = PCI_ERS_RESULT_NONE;
+	} else {
+		err_handler = dev->driver->err_handler;
+		vote = err_handler->error_detected(dev, result_data->state);
 	}
 
-	err_handler = dev->driver->err_handler;
-	vote = err_handler->error_detected(dev, result_data->state);
 	result_data->result = merge_result(result_data->result, vote);
-out:
 	device_unlock(&dev->dev);
 	return 0;
 }
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 213753b283a6..b52630b8eada 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -242,8 +242,7 @@ static void pcie_aspm_configure_common_clock(struct pcie_link_state *link)
 		return;
 
 	/* Training failed. Restore common clock configurations */
-	dev_printk(KERN_ERR, &parent->dev,
-		   "ASPM: Could not configure common clock\n");
+	dev_err(&parent->dev, "ASPM: Could not configure common clock\n");
 	list_for_each_entry(child, &linkbus->devices, bus_list)
 		pcie_capability_write_word(child, PCI_EXP_LNKCTL,
 					   child_reg[PCI_FUNC(child->devfn)]);
@@ -427,7 +426,8 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
 
 static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)
 {
-	pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, 0x3, val);
+	pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL,
+					   PCI_EXP_LNKCTL_ASPMC, val);
 }
 
 static void pcie_config_aspm_link(struct pcie_link_state *link, u32 state)
@@ -442,12 +442,12 @@ static void pcie_config_aspm_link(struct pcie_link_state *link, u32 state)
 		return;
 	/* Convert ASPM state to upstream/downstream ASPM register state */
 	if (state & ASPM_STATE_L0S_UP)
-		dwstream |= PCIE_LINK_STATE_L0S;
+		dwstream |= PCI_EXP_LNKCTL_ASPM_L0S;
 	if (state & ASPM_STATE_L0S_DW)
-		upstream |= PCIE_LINK_STATE_L0S;
+		upstream |= PCI_EXP_LNKCTL_ASPM_L0S;
 	if (state & ASPM_STATE_L1) {
-		upstream |= PCIE_LINK_STATE_L1;
-		dwstream |= PCIE_LINK_STATE_L1;
+		upstream |= PCI_EXP_LNKCTL_ASPM_L1;
+		dwstream |= PCI_EXP_LNKCTL_ASPM_L1;
 	}
 	/*
 	 * Spec 2.0 suggests all functions should be configured the
@@ -507,9 +507,7 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
 		 */
 		pcie_capability_read_dword(child, PCI_EXP_DEVCAP, &reg32);
 		if (!(reg32 & PCI_EXP_DEVCAP_RBER) && !aspm_force) {
-			dev_printk(KERN_INFO, &child->dev, "disabling ASPM"
-				" on pre-1.1 PCIe device.  You can enable it"
-				" with 'pcie_aspm=force'\n");
+			dev_info(&child->dev, "disabling ASPM on pre-1.1 PCIe device.  You can enable it with 'pcie_aspm=force'\n");
 			return -EINVAL;
 		}
 	}
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index ed129b414624..b42133afca98 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -120,8 +120,7 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
 		 * the value in this field indicates which MSI-X Table entry is
 		 * used to generate the interrupt message."
 		 */
-		pos = pci_pcie_cap(dev);
-		pci_read_config_word(dev, pos + PCI_EXP_FLAGS, &reg16);
+		pcie_capability_read_word(dev, PCI_EXP_FLAGS, &reg16);
 		entry = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9;
 		if (entry >= nr_entries)
 			goto Error;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3683f6094e3f..6186f03d84f3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -521,7 +521,7 @@ static unsigned char pcie_link_speed[] = {
 
 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
 {
-	bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
+	bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
 }
 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
 
@@ -579,14 +579,16 @@ static void pci_set_bus_speed(struct pci_bus *bus)
 	if (pos) {
 		u16 status;
 		enum pci_bus_speed max;
-		pci_read_config_word(bridge, pos + 2, &status);
 
-		if (status & 0x8000) {
+		pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
+				     &status);
+
+		if (status & PCI_X_SSTATUS_533MHZ) {
 			max = PCI_SPEED_133MHz_PCIX_533;
-		} else if (status & 0x4000) {
+		} else if (status & PCI_X_SSTATUS_266MHZ) {
 			max = PCI_SPEED_133MHz_PCIX_266;
-		} else if (status & 0x0002) {
-			if (((status >> 12) & 0x3) == 2) {
+		} else if (status & PCI_X_SSTATUS_133MHZ) {
+			if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) {
 				max = PCI_SPEED_133MHz_PCIX_ECC;
 			} else {
 				max = PCI_SPEED_133MHz_PCIX;
@@ -596,7 +598,8 @@ static void pci_set_bus_speed(struct pci_bus *bus)
 		}
 
 		bus->max_bus_speed = max;
-		bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
+		bus->cur_bus_speed = pcix_bus_speed[
+			(status & PCI_X_SSTATUS_FREQ) >> 6];
 
 		return;
 	}
@@ -607,7 +610,7 @@ static void pci_set_bus_speed(struct pci_bus *bus)
 		u16 linksta;
 
 		pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
-		bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
+		bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
 
 		pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
 		pcie_update_link_speed(bus, linksta);
@@ -975,6 +978,7 @@ int pci_setup_device(struct pci_dev *dev)
 	dev->sysdata = dev->bus->sysdata;
 	dev->dev.parent = dev->bus->bridge;
 	dev->dev.bus = &pci_bus_type;
+	dev->dev.type = &pci_dev_type;
 	dev->hdr_type = hdr_type & 0x7f;
 	dev->multifunction = !!(hdr_type & 0x80);
 	dev->error_state = pci_channel_io_normal;
@@ -1889,6 +1893,28 @@ unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
 	return max;
 }
 
+/**
+ * pci_rescan_bus - scan a PCI bus for devices.
+ * @bus: PCI bus to scan
+ *
+ * Scan a PCI bus and child buses for new devices, adds them,
+ * and enables them.
+ *
+ * Returns the max number of subordinate bus discovered.
+ */
+unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
+{
+	unsigned int max;
+
+	max = pci_scan_child_bus(bus);
+	pci_assign_unassigned_bus_resources(bus);
+	pci_enable_bridges(bus);
+	pci_bus_add_devices(bus);
+
+	return max;
+}
+EXPORT_SYMBOL_GPL(pci_rescan_bus);
+
 EXPORT_SYMBOL(pci_add_new_bus);
 EXPORT_SYMBOL(pci_scan_slot);
 EXPORT_SYMBOL(pci_scan_bridge);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 22ad3ee0cf0b..8f7a6344e79e 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1790,6 +1790,45 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TOSHIBA_2,
 			 PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE,
 			 quirk_tc86c001_ide);
 
+/*
+ * PLX PCI 9050 PCI Target bridge controller has an errata that prevents the
+ * local configuration registers accessible via BAR0 (memory) or BAR1 (i/o)
+ * being read correctly if bit 7 of the base address is set.
+ * The BAR0 or BAR1 region may be disabled (size 0) or enabled (size 128).
+ * Re-allocate the regions to a 256-byte boundary if necessary.
+ */
+static void quirk_plx_pci9050(struct pci_dev *dev)
+{
+	unsigned int bar;
+
+	/* Fixed in revision 2 (PCI 9052). */
+	if (dev->revision >= 2)
+		return;
+	for (bar = 0; bar <= 1; bar++)
+		if (pci_resource_len(dev, bar) == 0x80 &&
+		    (pci_resource_start(dev, bar) & 0x80)) {
+			struct resource *r = &dev->resource[bar];
+			dev_info(&dev->dev,
+				 "Re-allocating PLX PCI 9050 BAR %u to length 256 to avoid bit 7 bug\n",
+				 bar);
+			r->start = 0;
+			r->end = 0xff;
+		}
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+			 quirk_plx_pci9050);
+/*
+ * The following Meilhaus (vendor ID 0x1402) device IDs (amongst others)
+ * may be using the PLX PCI 9050: 0x0630, 0x0940, 0x0950, 0x0960, 0x100b,
+ * 0x1400, 0x140a, 0x140b, 0x14e0, 0x14ea, 0x14eb, 0x1604, 0x1608, 0x160c,
+ * 0x168f, 0x2000, 0x2600, 0x3000, 0x810a, 0x810b.
+ *
+ * Currently, device IDs 0x2000 and 0x2600 are used by the Comedi "me_daq"
+ * driver.
+ */
+DECLARE_PCI_FIXUP_HEADER(0x1402, 0x2000, quirk_plx_pci9050);
+DECLARE_PCI_FIXUP_HEADER(0x1402, 0x2600, quirk_plx_pci9050);
+
 static void quirk_netmos(struct pci_dev *dev)
 {
 	unsigned int num_parallel = (dev->subsystem_device & 0xf0) >> 4;
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 513972f3ed13..7c0fd9252e6f 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -111,3 +111,39 @@ void pci_stop_and_remove_bus_device(struct pci_dev *dev)
 	pci_remove_bus_device(dev);
 }
 EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
+
+void pci_stop_root_bus(struct pci_bus *bus)
+{
+	struct pci_dev *child, *tmp;
+	struct pci_host_bridge *host_bridge;
+
+	if (!pci_is_root_bus(bus))
+		return;
+
+	host_bridge = to_pci_host_bridge(bus->bridge);
+	list_for_each_entry_safe_reverse(child, tmp,
+					 &bus->devices, bus_list)
+		pci_stop_bus_device(child);
+
+	/* stop the host bridge */
+	device_del(&host_bridge->dev);
+}
+
+void pci_remove_root_bus(struct pci_bus *bus)
+{
+	struct pci_dev *child, *tmp;
+	struct pci_host_bridge *host_bridge;
+
+	if (!pci_is_root_bus(bus))
+		return;
+
+	host_bridge = to_pci_host_bridge(bus->bridge);
+	list_for_each_entry_safe(child, tmp,
+				 &bus->devices, bus_list)
+		pci_remove_bus_device(child);
+	pci_remove_bus(bus);
+	host_bridge->bus = NULL;
+
+	/* remove the host bridge */
+	put_device(&host_bridge->dev);
+}
diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index 0b3037ab8b93..ab886b7ee327 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -118,11 +118,17 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
 	void __iomem *rom;
 
 	/*
+	 * Some devices may provide ROMs via a source other than the BAR
+	 */
+	if (pdev->rom && pdev->romlen) {
+		*size = pdev->romlen;
+		return phys_to_virt(pdev->rom);
+	/*
 	 * IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy
 	 * memory map if the VGA enable bit of the Bridge Control register is
 	 * set for embedded VGA.
 	 */
-	if (res->flags & IORESOURCE_ROM_SHADOW) {
+	} else if (res->flags & IORESOURCE_ROM_SHADOW) {
 		/* primary video rom always starts here */
 		start = (loff_t)0xC0000;
 		*size = 0x20000; /* cover C000:0 through E000:0 */
@@ -181,7 +187,8 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
 	if (res->flags & (IORESOURCE_ROM_COPY | IORESOURCE_ROM_BIOS_COPY))
 		return;
 
-	iounmap(rom);
+	if (!pdev->rom || !pdev->romlen)
+		iounmap(rom);
 
 	/* Disable again before continuing, leave enabled if pci=rom */
 	if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 1e808ca338f8..6d3591d57ea0 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1550,25 +1550,12 @@ enable_all:
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
 
-#ifdef CONFIG_HOTPLUG
-/**
- * pci_rescan_bus - scan a PCI bus for devices.
- * @bus: PCI bus to scan
- *
- * Scan a PCI bus and child buses for new devices, adds them,
- * and enables them.
- *
- * Returns the max number of subordinate bus discovered.
- */
-unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
+void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
 {
-	unsigned int max;
 	struct pci_dev *dev;
 	LIST_HEAD(add_list); /* list of resources that
 					want additional resources */
 
-	max = pci_scan_child_bus(bus);
-
 	down_read(&pci_bus_sem);
 	list_for_each_entry(dev, &bus->devices, bus_list)
 		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
@@ -1579,11 +1566,4 @@ unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
 	up_read(&pci_bus_sem);
 	__pci_bus_assign_resources(bus, &add_list, NULL);
 	BUG_ON(!list_empty(&add_list));
-
-	pci_enable_bridges(bus);
-	pci_bus_add_devices(bus);
-
-	return max;
 }
-EXPORT_SYMBOL_GPL(pci_rescan_bus);
-#endif
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index db542f4196a4..966abc6054d7 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -1068,13 +1068,16 @@ static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev,
 	case XenbusStateInitialising:
 	case XenbusStateInitWait:
 	case XenbusStateInitialised:
-	case XenbusStateClosed:
 		break;
 
 	case XenbusStateConnected:
 		pcifront_try_connect(pdev);
 		break;
 
+	case XenbusStateClosed:
+		if (xdev->state == XenbusStateClosed)
+			break;
+		/* Missed the backend's CLOSING state -- fallthrough */
 	case XenbusStateClosing:
 		dev_warn(&xdev->dev, "backend going away!\n");
 		pcifront_try_disconnect(pdev);