Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932416Ab2EGUed (ORCPT ); Mon, 7 May 2012 16:34:33 -0400 Received: from acsinet15.oracle.com ([141.146.126.227]:18481 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932221Ab2EGUa3 (ORCPT ); Mon, 7 May 2012 16:30:29 -0400 From: Yinghai Lu To: Bjorn Helgaas , Benjamin Herrenschmidt , Tony Luck , David Miller , x86 Cc: Dominik Brodowski , Andrew Morton , Linus Torvalds , Greg Kroah-Hartman , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Yinghai Lu Subject: [PATCH 10/21] PCI: checking busn_res in pci_scan_root_bus() Date: Mon, 7 May 2012 13:29:55 -0700 Message-Id: <1336422606-4244-11-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1336422606-4244-1-git-send-email-yinghai@kernel.org> References: <1336422606-4244-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2094 Lines: 67 Some callers do not supply the bus number aperture, usually because they do not know the end. In this case, we assume the aperture extends from the root bus number to bus 255, scan the bus, and shrink the bus number resource so it ends at the largest bus number we found. This is obviously not correct because the actual end of the aperture may well be larger than the largest bus number we found. But I guess it's all we have for now. Also print out one info about that, so we could find out which path does not have busn_res in resources list. -v4: set found initial value to false. [bhelgaas: changelog, list _safe iterator unnecessary, use %pR format for bus] Signed-off-by: Yinghai Lu --- drivers/pci/probe.c | 22 +++++++++++++++++++++- 1 files changed, 21 insertions(+), 1 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 59011ce..6258f6f 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1788,13 +1788,33 @@ void pci_bus_release_busn_res(struct pci_bus *b) struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata, struct list_head *resources) { + struct pci_host_bridge_window *window; + bool found = false; struct pci_bus *b; + int max; + + list_for_each_entry(window, resources, list) + if (window->res->flags & IORESOURCE_BUS) { + found = true; + break; + } b = pci_create_root_bus(parent, bus, ops, sysdata, resources); if (!b) return NULL; - b->busn_res.end = pci_scan_child_bus(b); + if (!found) { + dev_info(&b->dev, + "No busn resource found for root bus, will use [bus %02x-ff]\n", + bus); + pci_bus_insert_busn_res(b, bus, 255); + } + + max = pci_scan_child_bus(b); + + if (!found) + pci_bus_update_busn_res_end(b, max); + pci_bus_add_devices(b); return b; } -- 1.7.7 -- 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/