Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754000AbZGWXEY (ORCPT ); Thu, 23 Jul 2009 19:04:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753940AbZGWXEY (ORCPT ); Thu, 23 Jul 2009 19:04:24 -0400 Received: from g1t0028.austin.hp.com ([15.216.28.35]:25662 "EHLO g1t0028.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751866AbZGWXEX (ORCPT ); Thu, 23 Jul 2009 19:04:23 -0400 Subject: [PATCH v3 2/2] PCI Hotplug: acpiphp: get pci_bus from acpi handle correctly To: jbarnes@virtuousgeek.org, lenb@kernel.org From: Alex Chiang Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Date: Thu, 23 Jul 2009 17:03:05 -0600 Message-ID: <20090723230305.4247.81288.stgit@bob.kio> In-Reply-To: <20090723230026.4247.12759.stgit@bob.kio> References: <20090723230026.4247.12759.stgit@bob.kio> User-Agent: StGit/0.14.3.386.gb02d MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2468 Lines: 75 We cannot simply call acpi_get_pci_dev() on any random ACPI handle and hope that it works, because a PCI root bridge may not have an associated struct pci_dev. This is allowed per the PCI specification, and is referred to as a non-materialized bridge. So, depending on the type of PCI bridge that the handle points to, use the appropriate interface to return the struct pci_bus correctly. Signed-off-by: Alex Chiang --- drivers/pci/hotplug/acpiphp_glue.c | 28 +++++++++++++++++----------- 1 files changed, 17 insertions(+), 11 deletions(-) diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 0cb0f83..2e5f259 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -62,6 +62,22 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus); static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus); static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); +static struct pci_bus *pci_bus_from_handle(acpi_handle handle) +{ + struct pci_bus *pbus; + struct acpi_pci_root *root; + + root = acpi_pci_find_root(handle); + if (root) + pbus = root->bus; + else { + struct pci_dev *pdev = acpi_get_pci_dev(handle); + pbus = pdev->subordinate; + pci_dev_put(pdev); + } + return pbus; +} + /* callback routine to check for the existence of a pci dock device */ static acpi_status is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) @@ -1387,16 +1403,7 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus) /* Program resources in newly inserted bridge */ static int acpiphp_configure_bridge (acpi_handle handle) { - struct pci_dev *dev; - struct pci_bus *bus; - - dev = acpi_get_pci_dev(handle); - if (!dev) { - err("cannot get PCI domain and bus number for bridge\n"); - return -EINVAL; - } - - bus = dev->bus; + struct pci_bus *bus = pci_bus_from_handle(handle); pci_bus_size_bridges(bus); pci_bus_assign_resources(bus); @@ -1404,7 +1411,6 @@ static int acpiphp_configure_bridge (acpi_handle handle) acpiphp_set_hpp_values(handle, bus); pci_enable_bridges(bus); acpiphp_configure_ioapics(handle); - pci_dev_put(dev); return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/