[PATCH v2 2/4] PCI: Split pci_bus_for_each_resource_p() out of pci_bus_for_each_resource()

Andy Shevchenko
2022-11-03T16:48:00Z

Refactor pci_bus_for_each_resource() in the same way as it's done in
pci_dev_for_each_resource() case. This will allow to hide iterator
inside the loop, where it's not used otherwise.

No functional changes intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
.clang-format | 1 +
drivers/pci/bus.c | 7 +++----
drivers/pci/hotplug/shpchp_sysfs.c | 8 ++++----
drivers/pci/pci.c | 5 ++---
drivers/pci/probe.c | 2 +-
drivers/pci/setup-bus.c | 10 ++++------
include/linux/pci.h | 14 ++++++++++----
7 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/.clang-format b/.clang-format
index 08d579fea6cf..b61fd8791346 100644
--- a/.clang-format
+++ b/.clang-format
@@ -520,6 +520,7 @@ ForEachMacros:
- 'of_property_for_each_string'
- 'of_property_for_each_u32'
- 'pci_bus_for_each_resource'
+ - 'pci_bus_for_each_resource_p'
- 'pci_dev_for_each_resource'
- 'pci_dev_for_each_resource_p'
- 'pci_doe_for_each_off'
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 3cef835b375f..fc8e9c11c5f2 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -161,13 +161,13 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
void *alignf_data,
struct pci_bus_region *region)
{
- int i, ret;
struct resource *r, avail;
resource_size_t max;
+ int ret;

type_mask |= IORESOURCE_TYPE_BITS;

- pci_bus_for_each_resource(bus, r, i) {
+ pci_bus_for_each_resource_p(bus, r) {
resource_size_t min_used = min;

if (!r)
@@ -264,9 +264,8 @@ bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
struct resource *res = &dev->resource[idx];
struct resource orig_res = *res;
struct resource *r;
- int i;

- pci_bus_for_each_resource(bus, r, i) {
+ pci_bus_for_each_resource_p(bus, r) {
resource_size_t start, end;

if (!r)
diff --git a/drivers/pci/hotplug/shpchp_sysfs.c b/drivers/pci/hotplug/shpchp_sysfs.c
index 64beed7a26be..ff04f0c5e7c3 100644
--- a/drivers/pci/hotplug/shpchp_sysfs.c
+++ b/drivers/pci/hotplug/shpchp_sysfs.c
@@ -24,16 +24,16 @@
static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
{
struct pci_dev *pdev;
- int index, busnr;
struct resource *res;
struct pci_bus *bus;
size_t len = 0;
+ int busnr;

pdev = to_pci_dev(dev);
bus = pdev->subordinate;

len += sysfs_emit_at(buf, len, "Free resources: memory\n");
- pci_bus_for_each_resource(bus, res, index) {
+ pci_bus_for_each_resource_p(bus, res) {
if (res && (res->flags & IORESOURCE_MEM) &&
!(res->flags & IORESOURCE_PREFETCH)) {
len += sysfs_emit_at(buf, len,
@@ -43,7 +43,7 @@ static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char
}
}
len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
- pci_bus_for_each_resource(bus, res, index) {
+ pci_bus_for_each_resource_p(bus, res) {
if (res && (res->flags & IORESOURCE_MEM) &&
(res->flags & IORESOURCE_PREFETCH)) {
len += sysfs_emit_at(buf, len,
@@ -53,7 +53,7 @@ static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char
}
}
len += sysfs_emit_at(buf, len, "Free resources: IO\n");
- pci_bus_for_each_resource(bus, res, index) {
+ pci_bus_for_each_resource_p(bus, res) {
if (res && (res->flags & IORESOURCE_IO)) {
len += sysfs_emit_at(buf, len,
"start = %8.8llx, length = %8.8llx\n",
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2127aba3550b..ff5b34337dab 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -782,9 +782,8 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
{
const struct pci_bus *bus = dev->bus;
struct resource *r;
- int i;

- pci_bus_for_each_resource(bus, r, i) {
+ pci_bus_for_each_resource_p(bus, r) {
if (!r)
continue;
if (resource_contains(r, res)) {
@@ -802,7 +801,7 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
* 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
+ * on pci_bus_for_each_resource_p() giving us those
* first.
*/
return r;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b66fa42c4b1f..3662e867a124 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -533,7 +533,7 @@ void pci_read_bridge_bases(struct pci_bus *child)
pci_read_bridge_mmio_pref(child);

if (dev->transparent) {
- pci_bus_for_each_resource(child->parent, res, i) {
+ pci_bus_for_each_resource_p(child->parent, res) {
if (res && res->flags) {
pci_bus_add_resource(child, res,
PCI_SUBTRACTIVE_DECODE);
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 336d6e6ef76a..83b2f308be7e 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -770,9 +770,8 @@ static struct resource *find_bus_resource_of_type(struct pci_bus *bus,
unsigned long type)
{
struct resource *r, *r_assigned = NULL;
- int i;

- pci_bus_for_each_resource(bus, r, i) {
+ pci_bus_for_each_resource_p(bus, r) {
if (r == &ioport_resource || r == &iomem_resource)
continue;
if (r && (r->flags & type_mask) == type && !r->parent)
@@ -1204,7 +1203,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
additional_mmio_pref_size = 0;
struct resource *pref;
struct pci_host_bridge *host;
- int hdr_type, i, ret;
+ int hdr_type, ret;

list_for_each_entry(dev, &bus->devices, bus_list) {
struct pci_bus *b = dev->subordinate;
@@ -1228,7 +1227,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
host = to_pci_host_bridge(bus->bridge);
if (!host->size_windows)
return;
- pci_bus_for_each_resource(bus, pref, i)
+ pci_bus_for_each_resource_p(bus, pref)
if (pref && (pref->flags & IORESOURCE_PREFETCH))
break;
hdr_type = -1; /* Intentionally invalid - not a PCI device. */
@@ -1333,12 +1332,11 @@ EXPORT_SYMBOL(pci_bus_size_bridges);

static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
{
- int i;
struct resource *parent_r;
unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;

- pci_bus_for_each_resource(b, parent_r, i) {
+ pci_bus_for_each_resource_p(b, parent_r) {
if (!parent_r)
continue;

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 3940435fa90a..165e4713360f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1433,10 +1433,16 @@ int devm_request_pci_bus_resources(struct device *dev,
/* Temporary until new and working PCI SBR API in place */
int pci_bridge_secondary_bus_reset(struct pci_dev *dev);

-#define pci_bus_for_each_resource(bus, res, i) \
- for (i = 0; \
- (res = pci_bus_resource_n(bus, i)) || i < PCI_BRIDGE_RESOURCE_NUM; \
- i++)
+#define __pci_bus_for_each_resource(bus, res, __i, vartype) \
+ for (vartype __i = 0; \
+ res = pci_bus_resource_n(bus, __i), __i < PCI_BRIDGE_RESOURCE_NUM; \
+ __i++)
+
+#define pci_bus_for_each_resource(bus, res, i) \
+ __pci_bus_for_each_resource(bus, res, i, )
+
+#define pci_bus_for_each_resource_p(bus, res) \
+ __pci_bus_for_each_resource(bus, res, i, unsigned int)

int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
struct resource *res, resource_size_t size,
--
2.35.1