PCI: add pci_bus_for_each_resource(), remove direct bus->resource[] refs

No functional change; this converts loops that iterate from 0 to
PCI_BUS_NUM_RESOURCES through pci_bus resource[] table to use the
pci_bus_for_each_resource() iterator instead.

This doesn't change the way resources are stored; it merely removes
dependencies on the fact that they're in a table.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

11 files changed, 32 insertions, 41 deletions

diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 783c83bb2b49..89f957ca3eb2 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -452,13 +452,12 @@ EXPORT_SYMBOL(pcibios_bus_to_resource);
 static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
 {
         unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
-        struct resource *devr = &dev->resource[idx];
+        struct resource *devr = &dev->resource[idx], *busr;
 
         if (!dev->bus)
                 return 0;
-        for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
-                struct resource *busr = dev->bus->resource[i];
 
+        pci_bus_for_each_resource(dev->bus, busr, i) {
                 if (!busr || ((busr->flags ^ devr->flags) & type_mask))
                         continue;
                 if ((devr->start) && (devr->start >= busr->start) &&
diff --git a/arch/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
index 2cb7e75ba1c0..6d8720a0a599 100644
--- a/arch/mn10300/unit-asb2305/pci.c
+++ b/arch/mn10300/unit-asb2305/pci.c
@@ -331,12 +331,10 @@ static int __init pci_check_direct(void)
 static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
 {
         unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
-        struct resource *devr = &dev->resource[idx];
+        struct resource *devr = &dev->resource[idx], *busr;
 
         if (dev->bus) {
-                for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                        struct resource *busr = dev->bus->resource[i];
-
+                pci_bus_for_each_resource(dev->bus, busr, i) {
                         if (!busr || (busr->flags ^ devr->flags) & type_mask)
                                 continue;
 
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index e640810e813f..2597f9545d8a 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1047,10 +1047,8 @@ static void __devinit pcibios_fixup_bridge(struct pci_bus *bus)
 
         struct pci_dev *dev = bus->self;
 
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
-                if ((res = bus->resource[i]) == NULL)
-                        continue;
-                if (!res->flags)
+        pci_bus_for_each_resource(bus, res, i) {
+                if (!res || !res->flags)
                         continue;
                 if (i >= 3 && bus->self->transparent)
                         continue;
@@ -1277,9 +1275,8 @@ void pcibios_allocate_bus_resources(struct pci_bus *bus)
         pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
                  pci_domain_nr(bus), bus->number);
 
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
-                if ((res = bus->resource[i]) == NULL || !res->flags
-                    || res->start > res->end || res->parent)
+        pci_bus_for_each_resource(bus, res, i) {
+                if (!res || !res->flags || res->start > res->end || res->parent)
                         continue;
                 if (bus->parent == NULL)
                         pr = (res->flags & IORESOURCE_IO) ?
diff --git a/arch/powerpc/platforms/fsl_uli1575.c b/arch/powerpc/platforms/fsl_uli1575.c
index fd23a1d4b39d..8b0c2082a783 100644
--- a/arch/powerpc/platforms/fsl_uli1575.c
+++ b/arch/powerpc/platforms/fsl_uli1575.c
@@ -222,6 +222,7 @@ static void __devinit quirk_final_uli5249(struct pci_dev *dev)
         int i;
         u8 *dummy;
         struct pci_bus *bus = dev->bus;
+        struct resource *res;
         resource_size_t end = 0;
 
         for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCES+3; i++) {
@@ -230,13 +231,12 @@ static void __devinit quirk_final_uli5249(struct pci_dev *dev)
                         end = pci_resource_end(dev, i);
         }
 
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                if ((bus->resource[i]) &&
-                        (bus->resource[i]->flags & IORESOURCE_MEM)) {
-                        if (bus->resource[i]->end == end)
-                                dummy = ioremap(bus->resource[i]->start, 0x4);
+        pci_bus_for_each_resource(bus, res, i) {
+                if (res && res->flags & IORESOURCE_MEM) {
+                        if (res->end == end)
+                                dummy = ioremap(res->start, 0x4);
                         else
-                                dummy = ioremap(bus->resource[i]->end - 3, 0x4);
+                                dummy = ioremap(res->end - 3, 0x4);
                         if (dummy) {
                                 in_8(dummy);
                                 iounmap(dummy);
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index a26135bb0ffd..e75d219fd107 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -43,6 +43,7 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
                 void *alignf_data)
 {
         int i, ret = -ENOMEM;
+        struct resource *r;
         resource_size_t max = -1;
 
         type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
@@ -51,8 +52,7 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
         if (!(res->flags & IORESOURCE_MEM_64))
                 max = PCIBIOS_MAX_MEM_32;
 
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                struct resource *r = bus->resource[i];
+        pci_bus_for_each_resource(bus, r, i) {
                 if (!r)
                         continue;
 
diff --git a/drivers/pci/hotplug/shpchp_sysfs.c b/drivers/pci/hotplug/shpchp_sysfs.c
index 29fa9d26adae..071b7dc0094b 100644
--- a/drivers/pci/hotplug/shpchp_sysfs.c
+++ b/drivers/pci/hotplug/shpchp_sysfs.c
@@ -47,8 +47,7 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
         bus = pdev->subordinate;
 
         out += sprintf(buf, "Free resources: memory\n");
-        for (index = 0; index < PCI_BUS_NUM_RESOURCES; index++) {
-                res = bus->resource[index];
+        pci_bus_for_each_resource(bus, res, index) {
                 if (res && (res->flags & IORESOURCE_MEM) &&
                                 !(res->flags & IORESOURCE_PREFETCH)) {
                         out += sprintf(out, "start = %8.8llx, "
@@ -58,8 +57,7 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
                 }
         }
         out += sprintf(out, "Free resources: prefetchable memory\n");
-        for (index = 0; index < PCI_BUS_NUM_RESOURCES; index++) {
-                res = bus->resource[index];
+        pci_bus_for_each_resource(bus, res, index) {
                 if (res && (res->flags & IORESOURCE_MEM) &&
                                (res->flags & IORESOURCE_PREFETCH)) {
                         out += sprintf(out, "start = %8.8llx, "
@@ -69,8 +67,7 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
                 }
         }
         out += sprintf(out, "Free resources: IO\n");
-        for (index = 0; index < PCI_BUS_NUM_RESOURCES; index++) {
-                res = bus->resource[index];
+        pci_bus_for_each_resource(bus, res, index) {
                 if (res && (res->flags & IORESOURCE_IO)) {
                         out += sprintf(out, "start = %8.8llx, "
                                         "length = %8.8llx\n",
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d62a5de81672..f4a2738bf0bf 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -386,10 +386,9 @@ pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
 {
         const struct pci_bus *bus = dev->bus;
         int i;
-        struct resource *best = NULL;
+        struct resource *best = NULL, *r;
 
-        for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                struct resource *r = bus->resource[i];
+        pci_bus_for_each_resource(bus, r, i) {
                 if (!r)
                         continue;
                 if (res->start && !(res->start >= r->start && res->end <= r->end))
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 743ed8c48b9c..bf32f07c4efb 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -387,8 +387,7 @@ static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned lon
         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
                                   IORESOURCE_PREFETCH;
 
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                r = bus->resource[i];
+        pci_bus_for_each_resource(bus, r, i) {
                 if (r == &ioport_resource || r == &iomem_resource)
                         continue;
                 if (r && (r->flags & type_mask) == type && !r->parent)
@@ -803,11 +802,10 @@ static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
 
 static void pci_bus_dump_res(struct pci_bus *bus)
 {
-        int i;
-
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                struct resource *res = bus->resource[i];
+        struct resource *res;
+        int i;
 
+        pci_bus_for_each_resource(bus, res, i) {
                 if (!res || !res->end || !res->flags)
                         continue;
 
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 45d75dc452f0..c67638fe6914 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -803,8 +803,7 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
                 return -EINVAL;
 #endif
 
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                res = s->cb_dev->bus->resource[i];
+        pci_bus_for_each_resource(s->cb_dev->bus, res, i) {
                 if (!res)
                         continue;
 
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index e4d12acdd525..1f2039d5e966 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -649,9 +649,10 @@ static int yenta_search_one_res(struct resource *root, struct resource *res,
 static int yenta_search_res(struct yenta_socket *socket, struct resource *res,
                             u32 min)
 {
+        struct resource *root;
         int i;
-        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-                struct resource *root = socket->dev->bus->resource[i];
+
+        pci_bus_for_each_resource(socket->dev->bus, root, i) {
                 if (!root)
                         continue;
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1a29f9f6b2dc..2ff9d26a078f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -829,6 +829,9 @@ int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
 void pci_release_selected_regions(struct pci_dev *, int);
 
 /* drivers/pci/bus.c */
+#define pci_bus_for_each_resource(bus, res, i)                          \
+        for (i = 0; res = bus->resource[i], i < PCI_BUS_NUM_RESOURCES; i++)
+
 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,