linux-kernel - [PATCH 3/8] PCI hotplug: fix wrong assumption in acpi_get_hp_params_from

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Date:	Wed, 28 Jan 2009 20:51:26 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	linux-pci@...r.kernel.org, "Barnes, Jesse" <jesse.barnes@...el.com>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	shaohua.li@...el.com, Grant Grundler <grundler@...isc-linux.org>
Subject: [PATCH 3/8] PCI hotplug: fix wrong assumption in acpi_get_hp_params_from_firmware

Current acpi_get_hp_params_from_firmware() has a assumption that
pci_bus->self is NULL on the root pci bus. But it might not true on
some platforms. Because of this wrong assumption, current
acpi_get_hp_params_from_firmware() might cause endless loop. We must
check pci_bus->parent instead.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>

---
 drivers/pci/hotplug/acpi_pcihp.c |   17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

Index: linux-2.6.29-rc2/drivers/pci/hotplug/acpi_pcihp.c
===================================================================
--- linux-2.6.29-rc2.orig/drivers/pci/hotplug/acpi_pcihp.c
+++ linux-2.6.29-rc2/drivers/pci/hotplug/acpi_pcihp.c
@@ -333,19 +333,14 @@ acpi_status acpi_get_hp_params_from_firm
 {
 	acpi_status status = AE_NOT_FOUND;
 	acpi_handle handle, phandle;
-	struct pci_bus *pbus = bus;
-	struct pci_dev *pdev;
+	struct pci_bus *pbus;
 
-	do {
-		pdev = pbus->self;
-		if (!pdev) {
-			handle = acpi_get_pci_rootbridge_handle(
-				pci_domain_nr(pbus), pbus->number);
+	handle = NULL;
+	for (pbus = bus; pbus; pbus = pbus->parent) {
+		handle = acpi_pci_get_bridge_handle(pbus);
+		if (handle)
 			break;
-		}
-		handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
-		pbus = pbus->parent;
-	} while (!handle);
+	}
 
 	/*
 	 * _HPP settings apply to all child buses, until another _HPP is


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