diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
index edb4e0097b75..076c35cd6cde 100644
--- a/arch/alpha/kernel/pci.c
+++ b/arch/alpha/kernel/pci.c
@@ -254,12 +254,6 @@ void pcibios_fixup_bus(struct pci_bus *bus)
 	}
 }
 
-int
-pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	return pci_enable_resources(dev, mask);
-}
-
 /*
  *  If we set up a device for bus mastering, we need to check the latency
  *  timer as certain firmware forgets to set it properly, as seen
diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
index 66804adcacf0..70996cc66aa2 100644
--- a/arch/microblaze/pci/pci-common.c
+++ b/arch/microblaze/pci/pci-common.c
@@ -1294,11 +1294,6 @@ void pcibios_finish_adding_to_bus(struct pci_bus *bus)
 }
 EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	return pci_enable_resources(dev, mask);
-}
-
 static void pcibios_setup_phb_resources(struct pci_controller *hose,
 					struct list_head *resources)
 {
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 66670ff262a0..1df1d29ac81d 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -686,27 +686,13 @@ int pcibios_add_device(struct pci_dev *pdev)
 int pcibios_enable_device(struct pci_dev *pdev, int mask)
 {
 	struct zpci_dev *zdev = get_zdev(pdev);
-	struct resource *res;
-	u16 cmd;
-	int i;
 
 	zdev->pdev = pdev;
 	zpci_debug_init_device(zdev);
 	zpci_fmb_enable_device(zdev);
 	zpci_map_resources(zdev);
 
-	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
-	for (i = 0; i < PCI_BAR_COUNT; i++) {
-		res = &pdev->resource[i];
-
-		if (res->flags & IORESOURCE_IO)
-			return -EINVAL;
-
-		if (res->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
-	}
-	pci_write_config_word(pdev, PCI_COMMAND, cmd);
-	return 0;
+	return pci_enable_resources(pdev, mask);
 }
 
 void pcibios_disable_device(struct pci_dev *pdev)
diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 60ed3e1c4b75..1bc09ee7948f 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -186,11 +186,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 	return start;
 }
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	return pci_enable_resources(dev, mask);
-}
-
 static void __init
 pcibios_bus_report_status_early(struct pci_channel *hose,
 				int top_bus, int current_bus,
diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c
index 88aaaa57bb64..e16c4157e1ae 100644
--- a/arch/sparc/kernel/leon_pci.c
+++ b/arch/sparc/kernel/leon_pci.c
@@ -99,11 +99,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 	return res->start;
 }
 
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	return pci_enable_resources(dev, mask);
-}
-
 /* in/out routines taken from pcic.c
  *
  * This probably belongs here rather than ioport.c because
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
index a97a6452b812..077b7bc437e5 100644
--- a/arch/tile/kernel/pci_gx.c
+++ b/arch/tile/kernel/pci_gx.c
@@ -1064,18 +1064,6 @@ char *__init pcibios_setup(char *str)
 	return str;
 }
 
-/*
- * Enable memory address decoding, as appropriate, for the
- * device described by the 'dev' struct.
- *
- * This is called from the generic PCI layer, and can be called
- * for bridges or endpoints.
- */
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	return pci_enable_resources(dev, mask);
-}
-
 /*
  * Called for each device after PCI setup is done.
  * We initialize the PCI device capabilities conservatively, assuming that
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index fd972a3e4cbb..9fa8aa051f54 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -18,7 +18,6 @@
 #include <linux/pci_ids.h>
 #include <linux/pci.h>
 #include <linux/bitops.h>
-#include <linux/ioport.h>
 #include <linux/suspend.h>
 #include <asm/e820.h>
 #include <asm/io.h>
@@ -54,18 +53,6 @@ int fallback_aper_force __initdata;
 
 int fix_aperture __initdata = 1;
 
-static struct resource gart_resource = {
-	.name	= "GART",
-	.flags	= IORESOURCE_MEM,
-};
-
-static void __init insert_aperture_resource(u32 aper_base, u32 aper_size)
-{
-	gart_resource.start = aper_base;
-	gart_resource.end = aper_base + aper_size - 1;
-	insert_resource(&iomem_resource, &gart_resource);
-}
-
 /* This code runs before the PCI subsystem is initialized, so just
    access the northbridge directly. */
 
@@ -96,7 +83,6 @@ static u32 __init allocate_aperture(void)
 	memblock_reserve(addr, aper_size);
 	printk(KERN_INFO "Mapping aperture over %d KB of RAM @ %lx\n",
 			aper_size >> 10, addr);
-	insert_aperture_resource((u32)addr, aper_size);
 	register_nosave_region(addr >> PAGE_SHIFT,
 			       (addr+aper_size) >> PAGE_SHIFT);
 
@@ -444,12 +430,8 @@ int __init gart_iommu_hole_init(void)
 
 out:
 	if (!fix && !fallback_aper_force) {
-		if (last_aper_base) {
-			unsigned long n = (32 * 1024 * 1024) << last_aper_order;
-
-			insert_aperture_resource((u32)last_aper_base, n);
+		if (last_aper_base)
 			return 1;
-		}
 		return 0;
 	}
 
diff --git a/drivers/message/i2o/iop.c b/drivers/message/i2o/iop.c
index a8c08f332da0..92752fb5b2d3 100644
--- a/drivers/message/i2o/iop.c
+++ b/drivers/message/i2o/iop.c
@@ -652,6 +652,44 @@ static int i2o_iop_activate(struct i2o_controller *c)
 	return i2o_hrt_get(c);
 };
 
+static void i2o_res_alloc(struct i2o_controller *c, unsigned long flags)
+{
+	i2o_status_block *sb = c->status_block.virt;
+	struct resource *res = &c->mem_resource;
+	resource_size_t size, align;
+	int err;
+
+	res->name = c->pdev->bus->name;
+	res->flags = flags;
+	res->start = 0;
+	res->end = 0;
+	osm_info("%s: requires private memory resources.\n", c->name);
+
+	if (flags & IORESOURCE_MEM) {
+		size = sb->desired_mem_size;
+		align = 1 << 20;	/* unspecified, use 1Mb and play safe */
+	} else {
+		size = sb->desired_io_size;
+		align = 1 << 12;	/* unspecified, use 4Kb and play safe */
+	}
+
+	err = pci_bus_alloc_resource(c->pdev->bus, res, size, align, 0, 0,
+				     NULL, NULL);
+	if (err < 0)
+		return;
+
+	if (flags & IORESOURCE_MEM) {
+		c->mem_alloc = 1;
+		sb->current_mem_size = resource_size(res);
+		sb->current_mem_base = res->start;
+	} else if (flags & IORESOURCE_IO) {
+		c->io_alloc = 1;
+		sb->current_io_size = resource_size(res);
+		sb->current_io_base = res->start;
+	}
+	osm_info("%s: allocated PCI space %pR\n", c->name, res);
+}
+
 /**
  *	i2o_iop_systab_set - Set the I2O System Table of the specified IOP
  *	@c: I2O controller to which the system table should be send
@@ -665,52 +703,13 @@ static int i2o_iop_systab_set(struct i2o_controller *c)
 	struct i2o_message *msg;
 	i2o_status_block *sb = c->status_block.virt;
 	struct device *dev = &c->pdev->dev;
-	struct resource *root;
 	int rc;
 
-	if (sb->current_mem_size < sb->desired_mem_size) {
-		struct resource *res = &c->mem_resource;
-		res->name = c->pdev->bus->name;
-		res->flags = IORESOURCE_MEM;
-		res->start = 0;
-		res->end = 0;
-		osm_info("%s: requires private memory resources.\n", c->name);
-		root = pci_find_parent_resource(c->pdev, res);
-		if (root == NULL)
-			osm_warn("%s: Can't find parent resource!\n", c->name);
-		if (root && allocate_resource(root, res, sb->desired_mem_size, sb->desired_mem_size, sb->desired_mem_size, 1 << 20,	/* Unspecified, so use 1Mb and play safe */
-					      NULL, NULL) >= 0) {
-			c->mem_alloc = 1;
-			sb->current_mem_size = resource_size(res);
-			sb->current_mem_base = res->start;
-			osm_info("%s: allocated %llu bytes of PCI memory at "
-				"0x%016llX.\n", c->name,
-				(unsigned long long)resource_size(res),
-				(unsigned long long)res->start);
-		}
-	}
+	if (sb->current_mem_size < sb->desired_mem_size)
+		i2o_res_alloc(c, IORESOURCE_MEM);
 
-	if (sb->current_io_size < sb->desired_io_size) {
-		struct resource *res = &c->io_resource;
-		res->name = c->pdev->bus->name;
-		res->flags = IORESOURCE_IO;
-		res->start = 0;
-		res->end = 0;
-		osm_info("%s: requires private memory resources.\n", c->name);
-		root = pci_find_parent_resource(c->pdev, res);
-		if (root == NULL)
-			osm_warn("%s: Can't find parent resource!\n", c->name);
-		if (root && allocate_resource(root, res, sb->desired_io_size, sb->desired_io_size, sb->desired_io_size, 1 << 20,	/* Unspecified, so use 1Mb and play safe */
-					      NULL, NULL) >= 0) {
-			c->io_alloc = 1;
-			sb->current_io_size = resource_size(res);
-			sb->current_mem_base = res->start;
-			osm_info("%s: allocated %llu bytes of PCI I/O at "
-				"0x%016llX.\n", c->name,
-				(unsigned long long)resource_size(res),
-				(unsigned long long)res->start);
-		}
-	}
+	if (sb->current_io_size < sb->desired_io_size)
+		i2o_res_alloc(c, IORESOURCE_IO);
 
 	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
 	if (IS_ERR(msg))
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 00660cc502c5..fb8aed307c28 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -132,7 +132,7 @@ static void pci_clip_resource_to_region(struct pci_bus *bus,
 
 static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
 		resource_size_t size, resource_size_t align,
-		resource_size_t min, unsigned int type_mask,
+		resource_size_t min, unsigned long type_mask,
 		resource_size_t (*alignf)(void *,
 					  const struct resource *,
 					  resource_size_t,
@@ -144,7 +144,7 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
 	struct resource *r, avail;
 	resource_size_t max;
 
-	type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
+	type_mask |= IORESOURCE_TYPE_BITS;
 
 	pci_bus_for_each_resource(bus, r, i) {
 		if (!r)
@@ -162,8 +162,6 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
 
 		avail = *r;
 		pci_clip_resource_to_region(bus, &avail, region);
-		if (!resource_size(&avail))
-			continue;
 
 		/*
 		 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
@@ -202,7 +200,7 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
  */
 int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
 		resource_size_t size, resource_size_t align,
-		resource_size_t min, unsigned int type_mask,
+		resource_size_t min, unsigned long type_mask,
 		resource_size_t (*alignf)(void *,
 					  const struct resource *,
 					  resource_size_t,
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 06ace6248c61..47aaf22d814e 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c
@@ -32,11 +32,6 @@ void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
 	bridge->release_data = release_data;
 }
 
-static bool resource_contains(struct resource *res1, struct resource *res2)
-{
-	return res1->start <= res2->start && res1->end >= res2->end;
-}
-
 void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
 			     struct resource *res)
 {
@@ -45,9 +40,6 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
 	resource_size_t offset = 0;
 
 	list_for_each_entry(window, &bridge->windows, list) {
-		if (resource_type(res) != resource_type(window->res))
-			continue;
-
 		if (resource_contains(window->res, res)) {
 			offset = window->offset;
 			break;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 505fbb670d6a..7325d43bf030 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -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;
@@ -4262,6 +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;
 	}
@@ -4275,6 +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;
 		}
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 509494381a7a..ef09f5f2fe6c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -252,6 +252,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 			/* Address above 32-bit boundary; disable the BAR */
 			pci_write_config_dword(dev, pos, 0);
 			pci_write_config_dword(dev, pos + 4, 0);
+			res->flags |= IORESOURCE_UNSET;
 			region.start = 0;
 			region.end = sz64;
 			bar_disabled = true;
@@ -1107,10 +1108,10 @@ int pci_setup_device(struct pci_dev *dev)
 		pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
 
 		/*
-		 *	Do the ugly legacy mode stuff here rather than broken chip
-		 *	quirk code. Legacy mode ATA controllers have fixed
-		 *	addresses. These are not always echoed in BAR0-3, and
-		 *	BAR0-3 in a few cases contain junk!
+		 * Do the ugly legacy mode stuff here rather than broken chip
+		 * quirk code. Legacy mode ATA controllers have fixed
+		 * addresses. These are not always echoed in BAR0-3, and
+		 * BAR0-3 in a few cases contain junk!
 		 */
 		if (class == PCI_CLASS_STORAGE_IDE) {
 			u8 progif;
@@ -1121,11 +1122,15 @@ int pci_setup_device(struct pci_dev *dev)
 				res = &dev->resource[0];
 				res->flags = LEGACY_IO_RESOURCE;
 				pcibios_bus_to_resource(dev->bus, res, &region);
+				dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
+					 res);
 				region.start = 0x3F6;
 				region.end = 0x3F6;
 				res = &dev->resource[1];
 				res->flags = LEGACY_IO_RESOURCE;
 				pcibios_bus_to_resource(dev->bus, res, &region);
+				dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
+					 res);
 			}
 			if ((progif & 4) == 0) {
 				region.start = 0x170;
@@ -1133,11 +1138,15 @@ int pci_setup_device(struct pci_dev *dev)
 				res = &dev->resource[2];
 				res->flags = LEGACY_IO_RESOURCE;
 				pcibios_bus_to_resource(dev->bus, res, &region);
+				dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
+					 res);
 				region.start = 0x376;
 				region.end = 0x376;
 				res = &dev->resource[3];
 				res->flags = LEGACY_IO_RESOURCE;
 				pcibios_bus_to_resource(dev->bus, res, &region);
+				dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
+					 res);
 			}
 		}
 		break;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index ed2ed867c34c..e7292065a1b1 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -296,6 +296,7 @@ static void quirk_s3_64M(struct pci_dev *dev)
 	struct resource *r = &dev->resource[0];
 
 	if ((r->start & 0x3ffffff) || r->end != r->start + 0x3ffffff) {
+		r->flags |= IORESOURCE_UNSET;
 		r->start = 0;
 		r->end = 0x3ffffff;
 	}
@@ -937,6 +938,8 @@ DECLARE_PCI_FIXUP_RESUME_EARLY(PCI_VENDOR_ID_AMD,	PCI_DEVICE_ID_AMD_FE_GATE_700C
 static void quirk_dunord(struct pci_dev *dev)
 {
 	struct resource *r = &dev->resource [1];
+
+	r->flags |= IORESOURCE_UNSET;
 	r->start = 0;
 	r->end = 0xffffff;
 }
@@ -1740,6 +1743,7 @@ static void quirk_tc86c001_ide(struct pci_dev *dev)
 	struct resource *r = &dev->resource[0];
 
 	if (r->start & 0x8) {
+		r->flags |= IORESOURCE_UNSET;
 		r->start = 0;
 		r->end = 0xf;
 	}
@@ -1769,6 +1773,7 @@ static void quirk_plx_pci9050(struct pci_dev *dev)
 			dev_info(&dev->dev,
 				 "Re-allocating PLX PCI 9050 BAR %u to length 256 to avoid bit 7 bug\n",
 				 bar);
+			r->flags |= IORESOURCE_UNSET;
 			r->start = 0;
 			r->end = 0xff;
 		}
diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index 5d595724e5f4..c1839450d4d6 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -197,8 +197,10 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
 void pci_cleanup_rom(struct pci_dev *pdev)
 {
 	struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
+
 	if (res->flags & IORESOURCE_ROM_COPY) {
 		kfree((void*)(unsigned long)res->start);
+		res->flags |= IORESOURCE_UNSET;
 		res->flags &= ~IORESOURCE_ROM_COPY;
 		res->start = 0;
 		res->end = 0;
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 5c060b152ce6..7eed671d5586 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -44,6 +44,9 @@ void pci_update_resource(struct pci_dev *dev, int resno)
 	if (!res->flags)
 		return;
 
+	if (res->flags & IORESOURCE_UNSET)
+		return;
+
 	/*
 	 * Ignore non-moveable resources.  This might be legacy resources for
 	 * which no functional BAR register exists or another important
@@ -101,11 +104,6 @@ void pci_update_resource(struct pci_dev *dev, int resno)
 
 	if (disable)
 		pci_write_config_word(dev, PCI_COMMAND, cmd);
-
-	res->flags &= ~IORESOURCE_UNSET;
-	dev_dbg(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n",
-		resno, res, (unsigned long long)region.start,
-		(unsigned long long)region.end);
 }
 
 int pci_claim_resource(struct pci_dev *dev, int resource)
@@ -113,18 +111,23 @@ int pci_claim_resource(struct pci_dev *dev, int resource)
 	struct resource *res = &dev->resource[resource];
 	struct resource *root, *conflict;
 
+	if (res->flags & IORESOURCE_UNSET) {
+		dev_info(&dev->dev, "can't claim BAR %d %pR: no address assigned\n",
+			 resource, res);
+		return -EINVAL;
+	}
+
 	root = pci_find_parent_resource(dev, res);
 	if (!root) {
-		dev_info(&dev->dev, "no compatible bridge window for %pR\n",
-			 res);
+		dev_info(&dev->dev, "can't claim BAR %d %pR: no compatible bridge window\n",
+			 resource, res);
 		return -EINVAL;
 	}
 
 	conflict = request_resource_conflict(root, res);
 	if (conflict) {
-		dev_info(&dev->dev,
-			 "address space collision: %pR conflicts with %s %pR\n",
-			 res, conflict->name, conflict);
+		dev_info(&dev->dev, "can't claim BAR %d %pR: address conflict with %s %pR\n",
+			 resource, res, conflict->name, conflict);
 		return -EBUSY;
 	}
 
@@ -263,6 +266,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 	resource_size_t align, size;
 	int ret;
 
+	res->flags |= IORESOURCE_UNSET;
 	align = pci_resource_alignment(dev, res);
 	if (!align) {
 		dev_info(&dev->dev, "BAR %d: can't assign %pR "
@@ -282,6 +286,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 		ret = pci_revert_fw_address(res, dev, resno, size);
 
 	if (!ret) {
+		res->flags &= ~IORESOURCE_UNSET;
 		res->flags &= ~IORESOURCE_STARTALIGN;
 		dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
 		if (resno < PCI_BRIDGE_RESOURCES)
@@ -297,6 +302,7 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz
 	resource_size_t new_size;
 	int ret;
 
+	res->flags |= IORESOURCE_UNSET;
 	if (!res->parent) {
 		dev_info(&dev->dev, "BAR %d: can't reassign an unassigned resource %pR "
 			 "\n", resno, res);
@@ -307,6 +313,7 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz
 	new_size = resource_size(res) + addsize;
 	ret = _pci_assign_resource(dev, resno, new_size, min_align);
 	if (!ret) {
+		res->flags &= ~IORESOURCE_UNSET;
 		res->flags &= ~IORESOURCE_STARTALIGN;
 		dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
 		if (resno < PCI_BRIDGE_RESOURCES)
@@ -336,9 +343,15 @@ int pci_enable_resources(struct pci_dev *dev, int mask)
 				(!(r->flags & IORESOURCE_ROM_ENABLE)))
 			continue;
 
+		if (r->flags & IORESOURCE_UNSET) {
+			dev_err(&dev->dev, "can't enable device: BAR %d %pR not assigned\n",
+				i, r);
+			return -EINVAL;
+		}
+
 		if (!r->parent) {
-			dev_err(&dev->dev, "device not available "
-				"(can't reserve %pR)\n", r);
+			dev_err(&dev->dev, "can't enable device: BAR %d %pR not claimed\n",
+				i, r);
 			return -EINVAL;
 		}
 
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 89b7c24a36e9..5e3a906cc089 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -51,7 +51,7 @@ struct resource {
 
 #define IORESOURCE_EXCLUSIVE	0x08000000	/* Userland may not map this resource */
 #define IORESOURCE_DISABLED	0x10000000
-#define IORESOURCE_UNSET	0x20000000
+#define IORESOURCE_UNSET	0x20000000	/* No address assigned yet */
 #define IORESOURCE_AUTO		0x40000000
 #define IORESOURCE_BUSY		0x80000000	/* Driver has marked this resource busy */
 
@@ -169,6 +169,16 @@ static inline unsigned long resource_type(const struct resource *res)
 {
 	return res->flags & IORESOURCE_TYPE_BITS;
 }
+/* True iff r1 completely contains r2 */
+static inline bool resource_contains(struct resource *r1, struct resource *r2)
+{
+	if (resource_type(r1) != resource_type(r2))
+		return false;
+	if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
+		return false;
+	return r1->start <= r2->start && r1->end >= r2->end;
+}
+
 
 /* Convenience shorthand with allocation */
 #define request_region(start,n,name)		__request_region(&ioport_resource, (start), (n), (name), 0)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d47b352c2e11..aab57b4abe7f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1066,7 +1066,7 @@ void pci_bus_remove_resources(struct pci_bus *bus);
 int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
 			struct resource *res, resource_size_t size,
 			resource_size_t align, resource_size_t min,
-			unsigned int type_mask,
+			unsigned long type_mask,
 			resource_size_t (*alignf)(void *,
 						  const struct resource *,
 						  resource_size_t,
diff --git a/kernel/resource.c b/kernel/resource.c
index 3f285dce9347..673061c06da1 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -432,11 +432,6 @@ static void resource_clip(struct resource *res, resource_size_t min,
 		res->end = max;
 }
 
-static bool resource_contains(struct resource *res1, struct resource *res2)
-{
-	return res1->start <= res2->start && res1->end >= res2->end;
-}
-
 /*
  * Find empty slot in the resource tree with the given range and
  * alignment constraints
@@ -471,10 +466,11 @@ static int __find_resource(struct resource *root, struct resource *old,
 		arch_remove_reservations(&tmp);
 
 		/* Check for overflow after ALIGN() */
-		avail = *new;
 		avail.start = ALIGN(tmp.start, constraint->align);
 		avail.end = tmp.end;
+		avail.flags = new->flags & ~IORESOURCE_UNSET;
 		if (avail.start >= tmp.start) {
+			alloc.flags = avail.flags;
 			alloc.start = constraint->alignf(constraint->alignf_data, &avail,
 					size, constraint->align);
 			alloc.end = alloc.start + size - 1;
@@ -949,8 +945,8 @@ struct resource * __request_region(struct resource *parent,
 	res->name = name;
 	res->start = start;
 	res->end = start + n - 1;
-	res->flags = IORESOURCE_BUSY;
-	res->flags |= flags;
+	res->flags = resource_type(parent);
+	res->flags |= IORESOURCE_BUSY | flags;
 
 	write_lock(&resource_lock);
 
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 185b6d300ebc..5e2cf6f342f8 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -719,10 +719,15 @@ char *resource_string(char *buf, char *end, struct resource *res,
 		specp = &mem_spec;
 		decode = 0;
 	}
-	p = number(p, pend, res->start, *specp);
-	if (res->start != res->end) {
-		*p++ = '-';
-		p = number(p, pend, res->end, *specp);
+	if (decode && res->flags & IORESOURCE_UNSET) {
+		p = string(p, pend, "size ", str_spec);
+		p = number(p, pend, resource_size(res), *specp);
+	} else {
+		p = number(p, pend, res->start, *specp);
+		if (res->start != res->end) {
+			*p++ = '-';
+			p = number(p, pend, res->end, *specp);
+		}
 	}
 	if (decode) {
 		if (res->flags & IORESOURCE_MEM_64)