Merge branch 'pci/resource'

- Prevent assigning space to unimplemented bridge windows; previously we
  mistakenly assumed prefetchable window existed and assigned space and put
  a BAR there (Ahmed Naseef)

- Avoid shrinking bridge windows to fit in the initial Root Port window;
  this fixes one problem with devices with large BARs connected via
  switches, e.g., Thunderbolt (Ilpo Järvinen)

- Retain information about optional resources to make assignment during
  rescan more likely to succeed (Ilpo Järvinen)

- Add __resource_contains_unbound() for use in finding space for resources
  with no address assigned (Ilpo Järvinen)

- Pass full extent of empty space, not just the aligned space, to
  resource_alignf callback so free space before the requested alignment can
  be used (Ilpo Järvinen)

- Remove unnecessary second alignment from ARM, m68k, MIPS (Ilpo Järvinen)

- Place small resources before larger ones for better utilization of
  address space (Ilpo Järvinen)

- Fix alignment calculation for resource size larger than align, e.g.,
  bridge windows larger than the 1MB required alignment (Ilpo Järvinen)

* pci/resource:
  PCI: Fix alignment calculation for resource size larger than align
  PCI: Align head space better
  PCI: Rename window_alignment() to pci_min_window_alignment()
  parisc/PCI: Clean up align handling
  MIPS: PCI: Remove unnecessary second application of align
  m68k/PCI: Remove unnecessary second application of align
  ARM/PCI: Remove unnecessary second application of align
  resource: Rename 'tmp' variable to 'full_avail'
  resource: Pass full extent of empty space to resource_alignf callback
  resource: Add __resource_contains_unbound() for internal contains checks
  PCI: Fix premature removal from realloc_head list during resource assignment
  PCI: Prevent shrinking bridge window from its required size
  PCI: Prevent assignment to unsupported bridge windows

arch/alpha/kernel/pci.c

@@ -125,6 +125,7 @@ DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
 
 resource_size_t
 pcibios_align_resource(void *data, const struct resource *res,
+		       const struct resource *empty_res,
 		       resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;

arch/arm/kernel/bios32.c

@@ -560,7 +560,9 @@ char * __init pcibios_setup(char *str)
  * which might be mirrored at 0x0100-0x03ff..
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
-				resource_size_t size, resource_size_t align)
+				       const struct resource *empty_res,
+				       resource_size_t size,
+				       resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	resource_size_t start = res->start;
@@ -569,14 +571,15 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 	if (res->flags & IORESOURCE_IO && start & 0x300)
 		start = (start + 0x3ff) & ~0x3ff;
 
-	start = (start + align - 1) & ~(align - 1);
-
 	host_bridge = pci_find_host_bridge(dev->bus);
 
 	if (host_bridge->align_resource)
 		return host_bridge->align_resource(dev, res,
 				start, size, align);
 
+	if (res->flags & IORESOURCE_MEM)
+		return pci_align_resource(dev, res, empty_res, size, align);
+
 	return start;
 }
 

arch/m68k/kernel/pcibios.c

@@ -27,14 +27,18 @@
  * which might be mirrored at 0x0100-0x03ff..
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
-	resource_size_t size, resource_size_t align)
+				       const struct resource *empty_res,
+				       resource_size_t size,
+				       resource_size_t align)
 {
+	struct pci_dev *dev = data;
 	resource_size_t start = res->start;
 
 	if ((res->flags & IORESOURCE_IO) && (start & 0x300))
 		start = (start + 0x3ff) & ~0x3ff;
 
-	start = (start + align - 1) & ~(align - 1);
+	if (res->flags & IORESOURCE_MEM)
+		return pci_align_resource(dev, res, empty_res, size, align);
 
 	return start;
 }

arch/mips/pci/pci-generic.c

@@ -22,7 +22,8 @@
  * which might have be mirrored at 0x0100-0x03ff..
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
-				resource_size_t size, resource_size_t align)
+				       const struct resource *empty_res,
+				       resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	resource_size_t start = res->start;
@@ -31,14 +32,15 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 	if (res->flags & IORESOURCE_IO && start & 0x300)
 		start = (start + 0x3ff) & ~0x3ff;
 
-	start = (start + align - 1) & ~(align - 1);
-
 	host_bridge = pci_find_host_bridge(dev->bus);
 
 	if (host_bridge->align_resource)
 		return host_bridge->align_resource(dev, res,
 				start, size, align);
 
+	if (res->flags & IORESOURCE_MEM)
+		return pci_align_resource(dev, res, empty_res, size, align);
+
 	return start;
 }
 

arch/mips/pci/pci-legacy.c

@@ -52,6 +52,7 @@ unsigned long pci_address_to_pio(phys_addr_t address)
  */
 resource_size_t
 pcibios_align_resource(void *data, const struct resource *res,
+		       const struct resource *empty_res,
 		       resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
@@ -69,6 +70,8 @@ pcibios_align_resource(void *data, const struct resource *res,
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
 	} else if (res->flags & IORESOURCE_MEM) {
+		start = pci_align_resource(dev, res, empty_res, size, align);
+
 		/* Make sure we start at our min on all hoses */
 		if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
 			start = PCIBIOS_MIN_MEM + hose->mem_resource->start;

arch/parisc/kernel/pci.c

@@ -8,6 +8,7 @@
  * Copyright (C) 1999-2001 Hewlett-Packard Company
  * Copyright (C) 1999-2001 Grant Grundler
  */
+#include <linux/align.h>
 #include <linux/eisa.h>
 #include <linux/init.h>
 #include <linux/module.h>
@@ -196,9 +197,12 @@ void __ref pcibios_init_bridge(struct pci_dev *dev)
  * than res->start.
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
-				resource_size_t size, resource_size_t alignment)
+				       const struct resource *empty_res,
+				       resource_size_t size,
+				       resource_size_t alignment)
 {
-	resource_size_t mask, align, start = res->start;
+	struct pci_dev *dev = data;
+	resource_size_t align, start = res->start;
 
 	DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
 		pci_name(((struct pci_dev *) data)),
@@ -207,11 +211,10 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 
 	/* If it's not IO, then it's gotta be MEM */
 	align = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
-
-	/* Align to largest of MIN or input size */
-	mask = max(alignment, align) - 1;
-	start += mask;
-	start &= ~mask;
+	if (align > alignment)
+		start = ALIGN(start, align);
+	else
+		start = pci_align_resource(dev, res, empty_res, size, alignment);
 
 	return start;
 }

arch/powerpc/kernel/pci-common.c

@@ -1132,7 +1132,9 @@ static int skip_isa_ioresource_align(struct pci_dev *dev)
  * which might have be mirrored at 0x0100-0x03ff..
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
-				resource_size_t size, resource_size_t align)
+				       const struct resource *empty_res,
+				       resource_size_t size,
+				       resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	resource_size_t start = res->start;
@@ -1142,6 +1144,8 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 			return start;
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
+	} else if (res->flags & IORESOURCE_MEM) {
+		start = pci_align_resource(dev, res, empty_res, size, align);
 	}
 
 	return start;

arch/s390/pci/pci.c

@@ -266,6 +266,7 @@ static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
 }
 
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				       const struct resource *empty_res,
 				       resource_size_t size,
 				       resource_size_t align)
 {

arch/sh/drivers/pci/pci.c

@@ -168,7 +168,9 @@ subsys_initcall(pcibios_init);
  * modulo 0x400.
  */
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
-				resource_size_t size, resource_size_t align)
+				       const struct resource *empty_res,
+				       resource_size_t size,
+				       resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	struct pci_channel *hose = dev->sysdata;
@@ -183,6 +185,8 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 		 */
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
+	} else if (res->flags & IORESOURCE_MEM) {
+		start = pci_align_resource(dev, res, empty_res, size, align);
 	}
 
 	return start;

arch/x86/pci/i386.c

@@ -153,7 +153,8 @@ skip_isa_ioresource_align(struct pci_dev *dev) {
  */
 resource_size_t
 pcibios_align_resource(void *data, const struct resource *res,
-			resource_size_t size, resource_size_t align)
+		       const struct resource *empty_res,
+		       resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
 	resource_size_t start = res->start;
@@ -164,6 +165,8 @@ pcibios_align_resource(void *data, const struct resource *res,
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
 	} else if (res->flags & IORESOURCE_MEM) {
+		start = pci_align_resource(dev, res, empty_res, size, align);
+
 		/* The low 1MB range is reserved for ISA cards */
 		if (start < BIOS_END)
 			start = BIOS_END;

arch/xtensa/kernel/pci.c

@@ -39,6 +39,7 @@
  */
 resource_size_t
 pcibios_align_resource(void *data, const struct resource *res,
+		       const struct resource *empty_res,
 		       resource_size_t size, resource_size_t align)
 {
 	struct pci_dev *dev = data;
@@ -53,6 +54,8 @@ pcibios_align_resource(void *data, const struct resource *res,
 
 		if (start & 0x300)
 			start = (start + 0x3ff) & ~0x3ff;
+	} else if (res->flags & IORESOURCE_MEM) {
+		start = pci_align_resource(dev, res, empty_res, size, align);
 	}
 
 	return start;

drivers/pci/pci.h

@@ -1053,6 +1053,9 @@ static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
 	return resource_alignment(res);
 }
 
+resource_size_t pci_min_window_alignment(struct pci_bus *bus,
+					 unsigned long type);
+
 void pci_acs_init(struct pci_dev *dev);
 void pci_enable_acs(struct pci_dev *dev);
 #ifdef CONFIG_PCI_QUIRKS

drivers/pci/probe.c

@@ -378,6 +378,9 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
 	unsigned long io_mask, io_granularity, base, limit;
 	struct pci_bus_region region;
 
+	if (!dev->io_window)
+		return;
+
 	io_mask = PCI_IO_RANGE_MASK;
 	io_granularity = 0x1000;
 	if (dev->io_window_1k) {
@@ -448,6 +451,9 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
 	pci_bus_addr_t base, limit;
 	struct pci_bus_region region;
 
+	if (!dev->pref_window)
+		return;
+
 	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
 	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
 	base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;

drivers/pci/setup-bus.c

@@ -434,6 +434,10 @@ static void reassign_resources_sorted(struct list_head *realloc_head,
 		dev = add_res->dev;
 		idx = pci_resource_num(dev, res);
 
+		/* Skip this resource if not found in head list */
+		if (!res_to_dev_res(head, res))
+			continue;
+
 		/*
 		 * Skip resource that failed the earlier assignment and is
 		 * not optional as it would just fail again.
@@ -442,10 +446,6 @@ static void reassign_resources_sorted(struct list_head *realloc_head,
 		    !pci_resource_is_optional(dev, idx))
 			goto out;
 
-		/* Skip this resource if not found in head list */
-		if (!res_to_dev_res(head, res))
-			continue;
-
 		res_name = pci_resource_name(dev, idx);
 		add_size = add_res->add_size;
 		align = add_res->min_align;
@@ -1035,7 +1035,7 @@ resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus,
 #define PCI_P2P_DEFAULT_IO_ALIGN	SZ_4K
 #define PCI_P2P_DEFAULT_IO_ALIGN_1K	SZ_1K
 
-static resource_size_t window_alignment(struct pci_bus *bus, unsigned long type)
+resource_size_t pci_min_window_alignment(struct pci_bus *bus, unsigned long type)
 {
 	resource_size_t align = 1, arch_align;
 
@@ -1084,7 +1084,7 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t add_size,
 	if (resource_assigned(b_res))
 		return;
 
-	min_align = window_alignment(bus, IORESOURCE_IO);
+	min_align = pci_min_window_alignment(bus, IORESOURCE_IO);
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct resource *r;
 
@@ -1333,13 +1333,20 @@ static void pbus_size_mem(struct pci_bus *bus, struct resource *b_res,
 			r_size = resource_size(r);
 			size += max(r_size, align);
 
-			aligns[order] += align;
+			/*
+			 * If resource's size is larger than its alignment,
+			 * some configurations result in an unwanted gap in
+			 * the head space that the larger resource cannot
+			 * fill.
+			 */
+			if (r_size <= align)
+				aligns[order] += align;
 			if (order > max_order)
 				max_order = order;
 		}
 	}
 
-	win_align = window_alignment(bus, b_res->flags);
+	win_align = pci_min_window_alignment(bus, b_res->flags);
 	min_align = calculate_head_align(aligns, max_order);
 	min_align = max(min_align, win_align);
 	size0 = calculate_memsize(size, realloc_head ? 0 : add_size,
@@ -1837,6 +1844,7 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
 				 resource_size_t new_size)
 {
 	resource_size_t add_size, size = resource_size(res);
+	struct pci_dev_resource *dev_res;
 
 	if (resource_assigned(res))
 		return;
@@ -1849,9 +1857,46 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
 		pci_dbg(bridge, "bridge window %pR extended by %pa\n", res,
 			&add_size);
 	} else if (new_size < size) {
+		int idx = pci_resource_num(bridge, res);
+
+		/*
+		 * hpio/mmio/mmioprefsize hasn't been included at all? See the
+		 * add_size param at the callsites of calculate_memsize().
+		 */
+		if (!add_list)
+			return;
+
+		/* Only shrink if the hotplug extra relates to window size. */
+		switch (idx) {
+			case PCI_BRIDGE_IO_WINDOW:
+				if (size > pci_hotplug_io_size)
+					return;
+				break;
+			case PCI_BRIDGE_MEM_WINDOW:
+				if (size > pci_hotplug_mmio_size)
+					return;
+				break;
+			case PCI_BRIDGE_PREF_MEM_WINDOW:
+				if (size > pci_hotplug_mmio_pref_size)
+					return;
+				break;
+			default:
+				break;
+		}
+
+		dev_res = res_to_dev_res(add_list, res);
 		add_size = size - new_size;
-		pci_dbg(bridge, "bridge window %pR shrunken by %pa\n", res,
-			&add_size);
+		if (add_size < dev_res->add_size) {
+			dev_res->add_size -= add_size;
+			pci_dbg(bridge, "bridge window %pR optional size shrunken by %pa\n",
+				res, &add_size);
+		} else {
+			pci_dbg(bridge, "bridge window %pR optional size removed\n",
+				res);
+			pci_dev_res_remove_from_list(add_list, res);
+		}
+		return;
+
 	} else {
 		return;
 	}

drivers/pci/setup-res.c

@@ -244,6 +244,41 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
 	return 0;
 }
 
+/*
+ * For mem bridge windows, try to relocate tail remainder space to space
+ * before res->start if there's enough free space there. This enables
+ * tighter packing for resources.
+ */
+resource_size_t pci_align_resource(struct pci_dev *dev,
+				   const struct resource *res,
+				   const struct resource *empty_res,
+				   resource_size_t size,
+				   resource_size_t align)
+{
+	resource_size_t remainder, start_addr;
+
+	if (!(res->flags & IORESOURCE_MEM))
+		return res->start;
+
+	if (IS_ALIGNED(size, align))
+		return res->start;
+
+	remainder = size - ALIGN_DOWN(size, align);
+	/* Don't mess with size that doesn't align with window size granularity */
+	if (!IS_ALIGNED(remainder, pci_min_window_alignment(dev->bus, res->flags)))
+		return res->start;
+	/* Try to place remainder that doesn't fill align before */
+	if (res->start < remainder)
+		return res->start;
+	start_addr = res->start - remainder;
+	if (empty_res->start > start_addr)
+		return res->start;
+
+	pci_dbg(dev, "%pR: moving candidate start address below align to %llx\n",
+		res, (unsigned long long)start_addr);
+	return start_addr;
+}
+
 /*
  * We don't have to worry about legacy ISA devices, so nothing to do here.
  * This is marked as __weak because multiple architectures define it; it should
@@ -251,10 +286,13 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
  */
 resource_size_t __weak pcibios_align_resource(void *data,
 					      const struct resource *res,
+					      const struct resource *empty_res,
 					      resource_size_t size,
 					      resource_size_t align)
 {
-       return res->start;
+	struct pci_dev *dev = data;
+
+	return pci_align_resource(dev, res, empty_res, size, align);
 }
 
 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,

drivers/pcmcia/rsrc_nonstatic.c

@@ -602,7 +602,8 @@ static resource_size_t pcmcia_common_align(struct pcmcia_align_data *align_data,
 
 static resource_size_t
 pcmcia_align(void *align_data, const struct resource *res,
-	resource_size_t size, resource_size_t align)
+	     const struct resource *empty_res,
+	     resource_size_t size, resource_size_t align)
 {
 	struct pcmcia_align_data *data = align_data;
 	struct resource_map *m;

include/linux/ioport.h

@@ -202,6 +202,7 @@ enum {
  * typedef resource_alignf - Resource alignment callback
  * @data:	Private data used by the callback
  * @res:	Resource candidate range (an empty resource space)
+ * @empty_res:	Empty resource range without alignment applied
  * @size:	The minimum size of the empty space
  * @align:	Alignment from the constraints
  *
@@ -212,6 +213,7 @@ enum {
  */
 typedef resource_size_t (*resource_alignf)(void *data,
 					   const struct resource *res,
+					   const struct resource *empty_res,
 					   resource_size_t size,
 					   resource_size_t align);
 
@@ -304,14 +306,28 @@ static inline unsigned long resource_ext_type(const struct resource *res)
 {
 	return res->flags & IORESOURCE_EXT_TYPE_BITS;
 }
-/* True iff r1 completely contains r2 */
-static inline bool resource_contains(const struct resource *r1, const struct resource *r2)
+
+/*
+ * For checking if @r1 completely contains @r2 for resources that have real
+ * addresses but are not yet crafted into the resource tree. Normally
+ * resource_contains() should be used instead of this function as it checks
+ * also IORESOURCE_UNSET flag.
+ */
+static inline bool __resource_contains_unbound(const struct resource *r1,
+					       const struct resource *r2)
 {
 	if (resource_type(r1) != resource_type(r2))
 		return false;
+
+	return r1->start <= r2->start && r1->end >= r2->end;
+}
+/* True iff r1 completely contains r2 */
+static inline bool resource_contains(const struct resource *r1, const struct resource *r2)
+{
 	if (r1->flags & IORESOURCE_UNSET || r2->flags & IORESOURCE_UNSET)
 		return false;
-	return r1->start <= r2->start && r1->end >= r2->end;
+
+	return __resource_contains_unbound(r1, r2);
 }
 
 /* True if any part of r1 overlaps r2 */

include/linux/pci.h

@@ -1212,9 +1212,15 @@ int __must_check pcibios_enable_device(struct pci_dev *, int mask);
 char *pcibios_setup(char *str);
 
 /* Used only when drivers/pci/setup.c is used */
-resource_size_t pcibios_align_resource(void *, const struct resource *,
-				resource_size_t,
-				resource_size_t);
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				       const struct resource *empty_res,
+				       resource_size_t size,
+				       resource_size_t align);
+resource_size_t pci_align_resource(struct pci_dev *dev,
+				   const struct resource *res,
+				   const struct resource *empty_res,
+				   resource_size_t size,
+				   resource_size_t align);
 
 /* Generic PCI functions used internally */
 

kernel/resource.c

@@ -727,45 +727,46 @@ static int __find_resource_space(struct resource *root, struct resource *old,
 				 struct resource_constraint *constraint)
 {
 	struct resource *this = root->child;
-	struct resource tmp = *new, avail, alloc;
+	struct resource full_avail = *new, avail, alloc;
 	resource_alignf alignf = constraint->alignf;
 
-	tmp.start = root->start;
+	full_avail.start = root->start;
 	/*
 	 * Skip past an allocated resource that starts at 0, since the assignment
-	 * of this->start - 1 to tmp->end below would cause an underflow.
+	 * of this->start - 1 to full_avail->end below would cause an underflow.
 	 */
 	if (this && this->start == root->start) {
-		tmp.start = (this == old) ? old->start : this->end + 1;
+		full_avail.start = (this == old) ? old->start : this->end + 1;
 		this = this->sibling;
 	}
 	for(;;) {
 		if (this)
-			tmp.end = (this == old) ?  this->end : this->start - 1;
+			full_avail.end = (this == old) ?  this->end : this->start - 1;
 		else
-			tmp.end = root->end;
+			full_avail.end = root->end;
 
-		if (tmp.end < tmp.start)
+		if (full_avail.end < full_avail.start)
 			goto next;
 
-		resource_clip(&tmp, constraint->min, constraint->max);
-		arch_remove_reservations(&tmp);
+		resource_clip(&full_avail, constraint->min, constraint->max);
+		arch_remove_reservations(&full_avail);
 
 		/* Check for overflow after ALIGN() */
-		avail.start = ALIGN(tmp.start, constraint->align);
-		avail.end = tmp.end;
-		avail.flags = new->flags & ~IORESOURCE_UNSET;
-		if (avail.start >= tmp.start) {
+		avail.start = ALIGN(full_avail.start, constraint->align);
+		avail.end = full_avail.end;
+		avail.flags = new->flags;
+		if (avail.start >= full_avail.start) {
 			alloc.flags = avail.flags;
 			if (alignf) {
 				alloc.start = alignf(constraint->alignf_data,
-						     &avail, size, constraint->align);
+						     &avail, &full_avail,
+						     size, constraint->align);
 			} else {
 				alloc.start = avail.start;
 			}
 			alloc.end = alloc.start + size - 1;
 			if (alloc.start <= alloc.end &&
-			    resource_contains(&avail, &alloc)) {
+			    __resource_contains_unbound(&full_avail, &alloc)) {
 				new->start = alloc.start;
 				new->end = alloc.end;
 				return 0;
@@ -776,7 +777,7 @@ next:		if (!this || this->end == root->end)
 			break;
 
 		if (this != old)
-			tmp.start = this->end + 1;
+			full_avail.start = this->end + 1;
 		this = this->sibling;
 	}
 	return -EBUSY;