Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757995AbZCRWkI (ORCPT ); Wed, 18 Mar 2009 18:40:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756784AbZCRWje (ORCPT ); Wed, 18 Mar 2009 18:39:34 -0400 Received: from g5t0009.atlanta.hp.com ([15.192.0.46]:32535 "EHLO g5t0009.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756113AbZCRWjc (ORCPT ); Wed, 18 Mar 2009 18:39:32 -0400 From: Alex Chiang Subject: [PATCH v4 01/12] PCI: pci_is_root_bus helper To: jbarnes@virtuousgeek.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kenji Kaneshige , Alex Chiang Date: Wed, 18 Mar 2009 16:39:30 -0600 Message-ID: <20090318223930.887.45421.stgit@bob.kio> In-Reply-To: <20090318222426.887.1008.stgit@bob.kio> References: <20090318222426.887.1008.stgit@bob.kio> User-Agent: StGIT/0.14.3.215.gff3d 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: 1277 Lines: 39 From: Kenji Kaneshige Introduce pci_is_root_bus helper function. This will help make code more consistent, as well as prevent incorrect assumptions (such as pci_bus->self == NULL on a root bus, which is not always true). Signed-off-by: Kenji Kaneshige Signed-off-by: Alex Chiang --- include/linux/pci.h | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/include/linux/pci.h b/include/linux/pci.h index 7baf2a5..a31f935 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -341,6 +341,15 @@ struct pci_bus { #define pci_bus_b(n) list_entry(n, struct pci_bus, node) #define to_pci_bus(n) container_of(n, struct pci_bus, dev) +/* + * Returns true if the pci bus is root (behind host-pci bridge), + * false otherwise + */ +static inline bool pci_is_root_bus(struct pci_bus *pbus) +{ + return !(pbus->parent); +} + #ifdef CONFIG_PCI_MSI static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev) { -- 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/