[PATCH v3 0/4] PCI: Add pci_dev_for_each_resource() helper and

[PATCH v3 0/4] PCI: Add pci_dev_for_each_resource() helper and

[Andy Shevchenko]

Provide two new helper macros to iterate over PCI device resources and
convert users.

Looking at it, refactor existing pci_bus_for_each_resource() and convert
users accordingly.

This applies on top of this patch Mika sent out earlier:
https://lore.kernel.org/r/20221114115953.40236-1-mika.westerberg@linux.intel.com

Changelog v3:
- rebased on top of v2 by Mika, see above
- added tag to pcmcia patch (Dominik)

Changelog v2:
- refactor to have two macros
- refactor existing pci_bus_for_each_resource() in the same way and
  convert users

Andy Shevchenko (3):
  PCI: Split pci_bus_for_each_resource_p() out of
    pci_bus_for_each_resource()
  EISA: Convert to use pci_bus_for_each_resource_p()
  pcmcia: Convert to use pci_bus_for_each_resource_p()

Mika Westerberg (1):
  PCI: Introduce pci_dev_for_each_resource()

 .clang-format                      |  3 +++
 arch/alpha/kernel/pci.c            |  5 ++---
 arch/arm/kernel/bios32.c           | 16 ++++++-------
 arch/mips/pci/pci-legacy.c         |  3 +--
 arch/powerpc/kernel/pci-common.c   |  5 ++---
 arch/sparc/kernel/leon_pci.c       |  5 ++---
 arch/sparc/kernel/pci.c            | 10 ++++-----
 arch/sparc/kernel/pcic.c           |  5 ++---
 drivers/eisa/pci_eisa.c            |  4 ++--
 drivers/pci/bus.c                  |  7 +++---
 drivers/pci/hotplug/shpchp_sysfs.c |  8 +++----
 drivers/pci/pci.c                  |  5 ++---
 drivers/pci/probe.c                |  2 +-
 drivers/pci/remove.c               |  5 ++---
 drivers/pci/setup-bus.c            | 36 ++++++++++++------------------
 drivers/pci/setup-res.c            |  4 +---
 drivers/pci/xen-pcifront.c         |  4 +---
 drivers/pcmcia/rsrc_nonstatic.c    |  9 +++-----
 drivers/pcmcia/yenta_socket.c      |  3 +--
 include/linux/pci.h                | 25 +++++++++++++++++----
 20 files changed, 78 insertions(+), 86 deletions(-)

-- 
2.35.1

[PATCH v3 1/4] PCI: Introduce pci_dev_for_each_resource()

[Andy Shevchenko]

From: Mika Westerberg <mika.westerberg@linux.intel.com>

Instead of open-coding it everywhere introduce a tiny helper that can be
used to iterate over each resource of a PCI device, and convert the most
obvious users into it.

While at it drop doubled empty line before pdev_sort_resources().

No functional changes intended.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 .clang-format                    |  2 ++
 arch/alpha/kernel/pci.c          |  5 ++---
 arch/arm/kernel/bios32.c         | 16 +++++++---------
 arch/mips/pci/pci-legacy.c       |  3 +--
 arch/powerpc/kernel/pci-common.c |  5 ++---
 arch/sparc/kernel/leon_pci.c     |  5 ++---
 arch/sparc/kernel/pci.c          | 10 ++++------
 arch/sparc/kernel/pcic.c         |  5 ++---
 drivers/pci/remove.c             |  5 ++---
 drivers/pci/setup-bus.c          | 26 ++++++++++----------------
 drivers/pci/setup-res.c          |  4 +---
 drivers/pci/xen-pcifront.c       |  4 +---
 include/linux/pci.h              | 11 +++++++++++
 13 files changed, 47 insertions(+), 54 deletions(-)

diff --git a/.clang-format b/.clang-format
index f98481a53ea8..08d579fea6cf 100644
--- a/.clang-format
+++ b/.clang-format
@@ -520,6 +520,8 @@ ForEachMacros:
   - 'of_property_for_each_string'
   - 'of_property_for_each_u32'
   - 'pci_bus_for_each_resource'
+  - 'pci_dev_for_each_resource'
+  - 'pci_dev_for_each_resource_p'
   - 'pci_doe_for_each_off'
   - 'pcl_for_each_chunk'
   - 'pcl_for_each_segment'
diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
index 64fbfb0763b2..4458eb7f44f0 100644
--- a/arch/alpha/kernel/pci.c
+++ b/arch/alpha/kernel/pci.c
@@ -288,11 +288,10 @@ pcibios_claim_one_bus(struct pci_bus *b)
 	struct pci_bus *child_bus;
 
 	list_for_each_entry(dev, &b->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
-
+		pci_dev_for_each_resource(dev, r, i) {
 			if (r->parent || !r->start || !r->flags)
 				continue;
 			if (pci_has_flag(PCI_PROBE_ONLY) ||
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index e7ef2b5bea9c..5254734b23e6 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -142,15 +142,15 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F,
  */
 static void pci_fixup_dec21285(struct pci_dev *dev)
 {
-	int i;
-
 	if (dev->devfn == 0) {
+		struct resource *r;
+
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			dev->resource[i].start = 0;
-			dev->resource[i].end   = 0;
-			dev->resource[i].flags = 0;
+		pci_dev_for_each_resource_p(dev, r) {
+			r->start = 0;
+			r->end = 0;
+			r->flags = 0;
 		}
 	}
 }
@@ -162,13 +162,11 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285, pci_fixup_d
 static void pci_fixup_ide_bases(struct pci_dev *dev)
 {
 	struct resource *r;
-	int i;
 
 	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
 		return;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		r = dev->resource + i;
+	pci_dev_for_each_resource_p(dev, r) {
 		if ((r->start & ~0x80) == 0x374) {
 			r->start |= 2;
 			r->end = r->start;
diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c
index 468722c8a5c6..ec2567f8efd8 100644
--- a/arch/mips/pci/pci-legacy.c
+++ b/arch/mips/pci/pci-legacy.c
@@ -249,12 +249,11 @@ static int pcibios_enable_resources(struct pci_dev *dev, int mask)
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
-	for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
+	pci_dev_for_each_resource(dev, r, idx) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<idx)))
 			continue;
 
-		r = &dev->resource[idx];
 		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 			continue;
 		if ((idx == PCI_ROM_RESOURCE) &&
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index d67cf79bf5d0..8ddcfa6bcb50 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1452,11 +1452,10 @@ void pcibios_claim_one_bus(struct pci_bus *bus)
 	struct pci_bus *child_bus;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
-
+		pci_dev_for_each_resource(dev, r, i) {
 			if (r->parent || !r->start || !r->flags)
 				continue;
 
diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c
index e5e5ff6b9a5c..b6663a3fbae9 100644
--- a/arch/sparc/kernel/leon_pci.c
+++ b/arch/sparc/kernel/leon_pci.c
@@ -62,15 +62,14 @@ void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	struct resource *res;
 	u16 cmd, oldcmd;
 	int i;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	oldcmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res, i) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<i)))
 			continue;
diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index cb1ef25116e9..a948a49817c7 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -663,11 +663,10 @@ static void pci_claim_bus_resources(struct pci_bus *bus)
 	struct pci_dev *dev;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
-
+		pci_dev_for_each_resource(dev, r, i) {
 			if (r->parent || !r->start || !r->flags)
 				continue;
 
@@ -724,15 +723,14 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	struct resource *res;
 	u16 cmd, oldcmd;
 	int i;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	oldcmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res, i) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<i)))
 			continue;
diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c
index ee4c9a9a171c..25fe0a061732 100644
--- a/arch/sparc/kernel/pcic.c
+++ b/arch/sparc/kernel/pcic.c
@@ -643,15 +643,14 @@ void pcibios_fixup_bus(struct pci_bus *bus)
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	struct resource *res;
 	u16 cmd, oldcmd;
 	int i;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	oldcmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res, i) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<i)))
 			continue;
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 0145aef1b930..1310e01fb540 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -5,10 +5,9 @@
 
 static void pci_free_resources(struct pci_dev *dev)
 {
-	int i;
+	struct resource *res;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = dev->resource + i;
+	pci_dev_for_each_resource_p(dev, res) {
 		if (res->parent)
 			release_resource(res);
 	}
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index dfa490da728d..7ba5f1ca0e38 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -124,20 +124,17 @@ static resource_size_t get_res_add_align(struct list_head *head,
 	return dev_res ? dev_res->min_align : 0;
 }
 
-
 /* Sort resources by alignment */
 static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 {
+	struct resource *r;
 	int i;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *r;
+	pci_dev_for_each_resource(dev, r, i) {
 		struct pci_dev_resource *dev_res, *tmp;
 		resource_size_t r_align;
 		struct list_head *n;
 
-		r = &dev->resource[i];
-
 		if (r->flags & IORESOURCE_PCI_FIXED)
 			continue;
 
@@ -895,10 +892,9 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
 
 	min_align = window_alignment(bus, IORESOURCE_IO);
 	list_for_each_entry(dev, &bus->devices, bus_list) {
-		int i;
+		struct resource *r;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
+		pci_dev_for_each_resource_p(dev, r) {
 			unsigned long r_size;
 
 			if (r->parent || !(r->flags & IORESOURCE_IO))
@@ -1014,10 +1010,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 	size = 0;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
+		pci_dev_for_each_resource(dev, r, i) {
 			resource_size_t r_size;
 
 			if (r->parent || (r->flags & IORESOURCE_PCI_FIXED) ||
@@ -1358,11 +1354,10 @@ static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
  */
 static void pdev_assign_fixed_resources(struct pci_dev *dev)
 {
-	int i;
+	struct resource *r;
 
-	for (i = 0; i <  PCI_NUM_RESOURCES; i++) {
+	pci_dev_for_each_resource_p(dev, r) {
 		struct pci_bus *b;
-		struct resource *r = &dev->resource[i];
 
 		if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
 		    !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
@@ -1845,13 +1840,12 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
 		 * peers of the upstream port.
 		 */
 		list_for_each_entry(dev, &bus->devices, bus_list) {
-			int i;
+			struct resource *dev_res;
 
 			if (dev == bridge)
 				continue;
 
-			for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-				const struct resource *dev_res = &dev->resource[i];
+			pci_dev_for_each_resource_p(dev, dev_res) {
 				resource_size_t dev_sz;
 				struct resource *b_res;
 
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index b492e67c3d87..967f9a758923 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -484,12 +484,10 @@ int pci_enable_resources(struct pci_dev *dev, int mask)
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+	pci_dev_for_each_resource(dev, r, i) {
 		if (!(mask & (1 << i)))
 			continue;
 
-		r = &dev->resource[i];
-
 		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 			continue;
 		if ((i == PCI_ROM_RESOURCE) &&
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 7378e2f3e525..ce485ef59656 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -390,9 +390,7 @@ static int pcifront_claim_resource(struct pci_dev *dev, void *data)
 	int i;
 	struct resource *r;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		r = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, r, i) {
 		if (!r->parent && r->start && r->flags) {
 			dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
 				pci_name(dev), i);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 28af4414f789..010996c2801a 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1407,6 +1407,17 @@ int pci_request_selected_regions(struct pci_dev *, int, const char *);
 int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
 void pci_release_selected_regions(struct pci_dev *, int);
 
+#define __pci_dev_for_each_resource(dev, res, __i, vartype)		\
+	for (vartype __i = 0;						\
+	     res = &(dev)->resource[__i], __i < PCI_NUM_RESOURCES;	\
+	     __i++)
+
+#define pci_dev_for_each_resource(dev, res, i)				\
+	__pci_dev_for_each_resource(dev, res, i, )
+
+#define pci_dev_for_each_resource_p(dev, res)				\
+	__pci_dev_for_each_resource(dev, res, i, unsigned int)
+
 /* drivers/pci/bus.c */
 void pci_add_resource(struct list_head *resources, struct resource *res);
 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
-- 
2.35.1

[PATCH v3 2/4] PCI: Split pci_bus_for_each_resource_p() out of pci_bus_for_each_resource()

[Andy Shevchenko]

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 9f3cc829dfee..9cb9939f0e79 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 1e234189aff1..8ec59b895c60 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 7ba5f1ca0e38..1e9896eaf89c 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 010996c2801a..7b2dcadfc457 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

[PATCH v3 3/4] EISA: Convert to use pci_bus_for_each_resource_p()

[Andy Shevchenko]

The pci_bus_for_each_resource_p() hides the iterator loop since
it may be not used otherwise. With this, we may drop that iterator
variable definition.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/eisa/pci_eisa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/eisa/pci_eisa.c b/drivers/eisa/pci_eisa.c
index 930c2332c3c4..907b86384396 100644
--- a/drivers/eisa/pci_eisa.c
+++ b/drivers/eisa/pci_eisa.c
@@ -20,8 +20,8 @@ static struct eisa_root_device pci_eisa_root;
 
 static int __init pci_eisa_init(struct pci_dev *pdev)
 {
-	int rc, i;
 	struct resource *res, *bus_res = NULL;
+	int rc;
 
 	if ((rc = pci_enable_device (pdev))) {
 		dev_err(&pdev->dev, "Could not enable device\n");
@@ -38,7 +38,7 @@ static int __init pci_eisa_init(struct pci_dev *pdev)
 	 * eisa_root_register() can only deal with a single io port resource,
 	*  so we use the first valid io port resource.
 	 */
-	pci_bus_for_each_resource(pdev->bus, res, i)
+	pci_bus_for_each_resource_p(pdev->bus, res)
 		if (res && (res->flags & IORESOURCE_IO)) {
 			bus_res = res;
 			break;
-- 
2.35.1

[PATCH v3 4/4] pcmcia: Convert to use pci_bus_for_each_resource_p()

[Andy Shevchenko]

The pci_bus_for_each_resource_p() hides the iterator loop since
it may be not used otherwise. With this, we may drop that iterator
variable definition.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
 drivers/pcmcia/rsrc_nonstatic.c | 9 +++------
 drivers/pcmcia/yenta_socket.c   | 3 +--
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index ad1141fddb4c..9d92d4bb6239 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -934,7 +934,7 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
 static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
 {
 	struct resource *res;
-	int i, done = 0;
+	int done = 0;
 
 	if (!s->cb_dev || !s->cb_dev->bus)
 		return -ENODEV;
@@ -960,12 +960,9 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
 	 */
 	if (s->cb_dev->bus->number == 0)
 		return -EINVAL;
-
-	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
-		res = s->cb_dev->bus->resource[i];
-#else
-	pci_bus_for_each_resource(s->cb_dev->bus, res, i) {
 #endif
+
+	pci_bus_for_each_resource_p(s->cb_dev->bus, res) {
 		if (!res)
 			continue;
 
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 3966a6ceb1ac..b200f2b99a7a 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -673,9 +673,8 @@ static int yenta_search_res(struct yenta_socket *socket, struct resource *res,
 			    u32 min)
 {
 	struct resource *root;
-	int i;
 
-	pci_bus_for_each_resource(socket->dev->bus, root, i) {
+	pci_bus_for_each_resource_p(socket->dev->bus, root) {
 		if (!root)
 			continue;
 
-- 
2.35.1

Re: [PATCH v3 0/4] PCI: Add pci_dev_for_each_resource() helper and

[Krzysztof Wilczyński]

Hello,

> Provide two new helper macros to iterate over PCI device resources and
> convert users.
> 
> Looking at it, refactor existing pci_bus_for_each_resource() and convert
> users accordingly.
> 
> This applies on top of this patch Mika sent out earlier:
> https://lore.kernel.org/r/20221114115953.40236-1-mika.westerberg@linux.intel.com
> 
> Changelog v3:
> - rebased on top of v2 by Mika, see above
> - added tag to pcmcia patch (Dominik)
[...]

Thank you Andy for all the improvements and Mika for the idea!

For the whole series:
  Reviewed-by: Krzysztof Wilczyński <kw@linux.com>

Looks very nice!

	Krzysztof