1 files changed, 72 insertions, 46 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index fdbc294821e6..7325d43bf030 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -108,12 +108,12 @@ static bool pcie_ari_disabled;
  */
 unsigned char pci_bus_max_busnr(struct pci_bus* bus)
 {
-	struct list_head *tmp;
+	struct pci_bus *tmp;
 	unsigned char max, n;
 
 	max = bus->busn_res.end;
-	list_for_each(tmp, &bus->children) {
-		n = pci_bus_max_busnr(pci_bus_b(tmp));
+	list_for_each_entry(tmp, &bus->children, node) {
+		n = pci_bus_max_busnr(tmp);
 		if(n > max)
 			max = n;
 	}
@@ -401,33 +401,40 @@ EXPORT_SYMBOL_GPL(pci_find_ht_capability);
  * @res: child resource record for which parent is sought
  *
  *  For given resource region of given device, return the resource
- *  region of parent bus the given region is contained in or where
- *  it should be allocated from.
+ *  region of parent bus the given region is contained in.
  */
 struct resource *
 pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
 {
 	const struct pci_bus *bus = dev->bus;
+	struct resource *r;
 	int i;
-	struct resource *best = NULL, *r;
 
 	pci_bus_for_each_resource(bus, r, i) {
 		if (!r)
 			continue;
-		if (res->start && !(res->start >= r->start && res->end <= r->end))
-			continue;	/* Not contained */
-		if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
-			continue;	/* Wrong type */
-		if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
-			return r;	/* Exact match */
-		/* We can't insert a non-prefetch resource inside a prefetchable parent .. */
-		if (r->flags & IORESOURCE_PREFETCH)
-			continue;
-		/* .. but we can put a prefetchable resource inside a non-prefetchable one */
-		if (!best)
-			best = r;
+		if (res->start && resource_contains(r, res)) {
+
+			/*
+			 * If the window is prefetchable but the BAR is
+			 * not, the allocator made a mistake.
+			 */
+			if (r->flags & IORESOURCE_PREFETCH &&
+			    !(res->flags & IORESOURCE_PREFETCH))
+				return NULL;
+
+			/*
+			 * If we're below a transparent bridge, there may
+			 * be both a positively-decoded aperture and a
+			 * subtractively-decoded region that contain the BAR.
+			 * We want the positively-decoded one, so this depends
+			 * on pci_bus_for_each_resource() giving us those
+			 * first.
+			 */
+			return r;
+		}
 	}
-	return best;
+	return NULL;
 }
 
 /**
@@ -1178,6 +1185,11 @@ int pci_load_and_free_saved_state(struct pci_dev *dev,
 }
 EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state);
 
+int __weak pcibios_enable_device(struct pci_dev *dev, int bars)
+{
+	return pci_enable_resources(dev, bars);
+}
+
 static int do_pci_enable_device(struct pci_dev *dev, int bars)
 {
 	int err;
@@ -1624,29 +1636,27 @@ static void pci_pme_list_scan(struct work_struct *work)
 	struct pci_pme_device *pme_dev, *n;
 
 	mutex_lock(&pci_pme_list_mutex);
-	if (!list_empty(&pci_pme_list)) {
-		list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
-			if (pme_dev->dev->pme_poll) {
-				struct pci_dev *bridge;
-
-				bridge = pme_dev->dev->bus->self;
-				/*
-				 * If bridge is in low power state, the
-				 * configuration space of subordinate devices
-				 * may be not accessible
-				 */
-				if (bridge && bridge->current_state != PCI_D0)
-					continue;
-				pci_pme_wakeup(pme_dev->dev, NULL);
-			} else {
-				list_del(&pme_dev->list);
-				kfree(pme_dev);
-			}
+	list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
+		if (pme_dev->dev->pme_poll) {
+			struct pci_dev *bridge;
+
+			bridge = pme_dev->dev->bus->self;
+			/*
+			 * If bridge is in low power state, the
+			 * configuration space of subordinate devices
+			 * may be not accessible
+			 */
+			if (bridge && bridge->current_state != PCI_D0)
+				continue;
+			pci_pme_wakeup(pme_dev->dev, NULL);
+		} else {
+			list_del(&pme_dev->list);
+			kfree(pme_dev);
 		}
-		if (!list_empty(&pci_pme_list))
-			schedule_delayed_work(&pci_pme_work,
-					      msecs_to_jiffies(PME_TIMEOUT));
 	}
+	if (!list_empty(&pci_pme_list))
+		schedule_delayed_work(&pci_pme_work,
+				      msecs_to_jiffies(PME_TIMEOUT));
 	mutex_unlock(&pci_pme_list_mutex);
 }
 
@@ -2193,21 +2203,18 @@ void pci_request_acs(void)
 }
 
 /**
- * pci_enable_acs - enable ACS if hardware support it
+ * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites
  * @dev: the PCI device
  */
-void pci_enable_acs(struct pci_dev *dev)
+static int pci_std_enable_acs(struct pci_dev *dev)
 {
 	int pos;
 	u16 cap;
 	u16 ctrl;
 
-	if (!pci_acs_enable)
-		return;
-
 	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
 	if (!pos)
-		return;
+		return -ENODEV;
 
 	pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap);
 	pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
@@ -2225,6 +2232,23 @@ void pci_enable_acs(struct pci_dev *dev)
 	ctrl |= (cap & PCI_ACS_UF);
 
 	pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
+
+	return 0;
+}
+
+/**
+ * pci_enable_acs - enable ACS if hardware support it
+ * @dev: the PCI device
+ */
+void pci_enable_acs(struct pci_dev *dev)
+{
+	if (!pci_acs_enable)
+		return;
+
+	if (!pci_std_enable_acs(dev))
+		return;
+
+	pci_dev_specific_enable_acs(dev);
 }
 
 static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags)
@@ -4250,6 +4274,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 				"Rounding up size of resource #%d to %#llx.\n",
 				i, (unsigned long long)size);
 		}
+		r->flags |= IORESOURCE_UNSET;
 		r->end = size - 1;
 		r->start = 0;
 	}
@@ -4263,6 +4288,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
 			r = &dev->resource[i];
 			if (!(r->flags & IORESOURCE_MEM))
 				continue;
+			r->flags |= IORESOURCE_UNSET;
 			r->end = resource_size(r) - 1;
 			r->start = 0;
 		}