linux-kernel - [PATCH -v3 04/47] x86, PCI: Fix non acpi path pci_sysdata leaking with release

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Date:	Sun, 18 Mar 2012 22:45:53 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH -v3 04/47] x86, PCI: Fix non acpi path pci_sysdata leaking with release_fn

Non acpi path, or root is not probed from acpi, during root bus removal
will get warning about leaking from pci_scan_bus_on_node.

Fix it with setting pci_host_bridge release function.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/pci/common.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 8e04ec5..35931f6 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -618,17 +618,19 @@ int pci_ext_cfg_avail(struct pci_dev *dev)
 		return 0;
 }
 
+static void release_pci_sysdata(struct pci_host_bridge *bridge)
+{
+	struct pci_sysdata *sd = bridge->release_data;
+
+	kfree(sd);
+}
+
 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 {
 	LIST_HEAD(resources);
 	struct pci_bus *bus = NULL;
 	struct pci_sysdata *sd;
 
-	/*
-	 * Allocate per-root-bus (not per bus) arch-specific data.
-	 * TODO: leak; this memory is never freed.
-	 * It's arguable whether it's worth the trouble to care.
-	 */
 	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 	if (!sd) {
 		printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
@@ -638,7 +640,10 @@ struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops,
 	x86_pci_root_bus_resources(busno, &resources);
 	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busno);
 	bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
-	if (!bus) {
+	if (bus)
+		pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
+					release_pci_sysdata, sd);
+	else {
 		pci_free_resource_list(&resources);
 		kfree(sd);
 	}
-- 
1.7.7

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