linux-kernel - PCI, PPC: use hotplug-safe iterators to walk PCI buses

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Message-Id: <1368631036-7845-1-git-send-email-jiang.liu@huawei.com>
Date:	Wed, 15 May 2013 23:17:16 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>
Cc:	Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Jiang Liu <liuj97@...il.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Bill Pemberton <wfp5p@...ginia.edu>,
	linuxppc-dev@...ts.ozlabs.org
Subject: PCI, PPC: use hotplug-safe iterators to walk PCI buses

Enhance PPC architecture specific code to use hotplug-safe iterators
to walk PCI buses.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Gavin Shan <shangw@...ux.vnet.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Bill Pemberton <wfp5p@...ginia.edu>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
---
Hi Benjamin,
	How about this version? Use pci_bus_to_host() instead
to simplify code.
Regards!
Gerry
---
 arch/powerpc/kernel/pci-common.c |  4 ++--
 arch/powerpc/kernel/pci_64.c     | 22 ++++++++--------------
 2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index fa12ae4..26fca09 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1400,7 +1400,7 @@ void __init pcibios_resource_survey(void)
 	struct pci_bus *b;
 
 	/* Allocate and assign resources */
-	list_for_each_entry(b, &pci_root_buses, node)
+	for_each_pci_root_bus(b)
 		pcibios_allocate_bus_resources(b);
 	pcibios_allocate_resources(0);
 	pcibios_allocate_resources(1);
@@ -1410,7 +1410,7 @@ void __init pcibios_resource_survey(void)
 	 * bus available resources to avoid allocating things on top of them
 	 */
 	if (!pci_has_flag(PCI_PROBE_ONLY)) {
-		list_for_each_entry(b, &pci_root_buses, node)
+		for_each_pci_root_bus(b)
 			pcibios_reserve_legacy_regions(b);
 	}
 
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 51a133a..8bea231 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -207,10 +207,8 @@ void pcibios_setup_phb_io_space(struct pci_controller *hose)
 long sys_pciconfig_iobase(long which, unsigned long in_bus,
 			  unsigned long in_devfn)
 {
-	struct pci_controller* hose;
-	struct list_head *ln;
-	struct pci_bus *bus = NULL;
-	struct device_node *hose_node;
+	struct pci_controller* hose = NULL;
+	struct pci_bus *bus;
 
 	/* Argh ! Please forgive me for that hack, but that's the
 	 * simplest way to get existing XFree to not lockup on some
@@ -229,19 +227,15 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
 	/* That syscall isn't quite compatible with PCI domains, but it's
 	 * used on pre-domains setup. We return the first match
 	 */
-
-	for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
-		bus = pci_bus_b(ln);
-		if (in_bus >= bus->number && in_bus <= bus->busn_res.end)
+	for_each_pci_root_bus(bus)
+		if (in_bus >= bus->number && in_bus <= bus->busn_res.end) {
+			hose = pci_bus_to_host(bus);
+			pci_bus_put(bus);
 			break;
-		bus = NULL;
-	}
-	if (bus == NULL || bus->dev.of_node == NULL)
+		}
+	if (hose == NULL)
 		return -ENODEV;
 
-	hose_node = bus->dev.of_node;
-	hose = PCI_DN(hose_node)->phb;
-
 	switch (which) {
 	case IOBASE_BRIDGE_NUMBER:
 		return (long)hose->first_busno;
-- 
1.8.1.2

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