From patchwork Fri Feb 12 17:00:17 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 78931 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o1CH1g1H009987 for ; Fri, 12 Feb 2010 17:01:43 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757310Ab0BLRAZ (ORCPT ); Fri, 12 Feb 2010 12:00:25 -0500 Received: from g4t0017.houston.hp.com ([15.201.24.20]:22469 "EHLO g4t0017.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757428Ab0BLRAT (ORCPT ); Fri, 12 Feb 2010 12:00:19 -0500 Received: from g4t0009.houston.hp.com (g4t0009.houston.hp.com [16.234.32.26]) by g4t0017.houston.hp.com (Postfix) with ESMTP id 6004938349; Fri, 12 Feb 2010 17:00:19 +0000 (UTC) Received: from ldl (ldl.fc.hp.com [15.11.146.30]) by g4t0009.houston.hp.com (Postfix) with ESMTP id 52D3DC19E; Fri, 12 Feb 2010 17:00:18 +0000 (UTC) Received: from localhost (ldl.fc.hp.com [127.0.0.1]) by ldl (Postfix) with ESMTP id 28356CF000F; Fri, 12 Feb 2010 10:00:18 -0700 (MST) Received: from ldl ([127.0.0.1]) by localhost (ldl.fc.hp.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZZKc6Qv+Es+3; Fri, 12 Feb 2010 10:00:18 -0700 (MST) Received: from eh.fc.hp.com (eh.fc.hp.com [15.11.146.105]) by ldl (Postfix) with ESMTP id 0C6B9CF0009; Fri, 12 Feb 2010 10:00:18 -0700 (MST) Received: from bob.kio (localhost [127.0.0.1]) by eh.fc.hp.com (Postfix) with ESMTP id D7BF426396; Fri, 12 Feb 2010 10:00:17 -0700 (MST) Subject: [PATCH v3 6/7] PCI: break out primary/secondary/subordinate for readability To: Jesse Barnes From: Bjorn Helgaas Cc: Matthew Garrett , Tony Luck , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, Peter Haight , Gary Hade , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, linux-am33-list@redhat.com, Yinghai Lu , linux-alpha@vger.kernel.org, Ingo Molnar , Linus Torvalds , Larry Finger Date: Fri, 12 Feb 2010 10:00:17 -0700 Message-ID: <20100212170017.19522.97245.stgit@bob.kio> In-Reply-To: <20100212165532.19522.47240.stgit@bob.kio> References: <20100212165532.19522.47240.stgit@bob.kio> User-Agent: StGit/0.15 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Fri, 12 Feb 2010 17:01:43 +0000 (UTC) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index dacdeae..04e7e97 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -671,16 +671,20 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS); u32 buses, i, j = 0; u16 bctl; + u8 primary, secondary, subordinate; int broken = 0; pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); + primary = buses & 0xFF; + secondary = (buses >> 8) & 0xFF; + subordinate = (buses >> 16) & 0xFF; - dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n", - buses & 0xffffff, pass); + dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n", + secondary, subordinate, pass); /* Check if setup is sensible at all */ if (!pass && - ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) { + (primary != bus->number || secondary <= bus->number)) { dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n"); broken = 1; } @@ -691,15 +695,15 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); - if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) { - unsigned int cmax, busnr; + if ((secondary || subordinate) && !pcibios_assign_all_busses() && + !is_cardbus && !broken) { + unsigned int cmax; /* * Bus already configured by firmware, process it in the first * pass and just note the configuration. */ if (pass) goto out; - busnr = (buses >> 8) & 0xFF; /* * If we already got to this bus through a different bridge, @@ -708,13 +712,13 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, * However, we continue to descend down the hierarchy and * scan remaining child buses. */ - child = pci_find_bus(pci_domain_nr(bus), busnr); + child = pci_find_bus(pci_domain_nr(bus), secondary); if (!child) { - child = pci_add_new_bus(bus, dev, busnr); + child = pci_add_new_bus(bus, dev, secondary); if (!child) goto out; - child->primary = buses & 0xFF; - child->subordinate = (buses >> 16) & 0xFF; + child->primary = primary; + child->subordinate = subordinate; child->bridge_ctl = bctl; }