From patchwork Tue Jun 25 16:22:06 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 2778011 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C97D19F245 for ; Tue, 25 Jun 2013 16:21:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2772D20117 for ; Tue, 25 Jun 2013 16:21:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E42C3201DA for ; Tue, 25 Jun 2013 16:21:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752468Ab3FYQVR (ORCPT ); Tue, 25 Jun 2013 12:21:17 -0400 Received: from mga11.intel.com ([192.55.52.93]:16532 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752037Ab3FYQTX (ORCPT ); Tue, 25 Jun 2013 12:19:23 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 25 Jun 2013 09:20:31 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,938,1363158000"; d="scan'208";a="360258458" Received: from blue.fi.intel.com ([10.237.72.156]) by fmsmga002.fm.intel.com with ESMTP; 25 Jun 2013 09:19:18 -0700 Received: by blue.fi.intel.com (Postfix, from userid 1004) id D28C5E0092; Tue, 25 Jun 2013 19:22:10 +0300 (EEST) From: Mika Westerberg To: Greg Kroah-Hartman , Bjorn Helgaas , "Rafael J. Wysocki" Cc: Jesse Barnes , Yinghai Lu , john.ronciak@intel.com, miles.j.penner@intel.com, bruce.w.allan@intel.com, "Kirill A. Shutemov" , Heikki Krogerus , Mika Westerberg , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org Subject: [PATCH 2/6] PCI: acpiphp: enable_device(): rescan even if no new devices on slot Date: Tue, 25 Jun 2013 19:22:06 +0300 Message-Id: <1372177330-28013-3-git-send-email-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1372177330-28013-1-git-send-email-mika.westerberg@linux.intel.com> References: <1372177330-28013-1-git-send-email-mika.westerberg@linux.intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-8.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Kirill A. Shutemov" pci_scan_slot() returns number of new devices connected *directly* connected to the slot. Current enable_device() checks the return value and stops if it doesn't see a new device. In Thunderbolt chaining case the new device can be deeper in hierarchy, so do the rescan anyway. Because of that we must make sure that pcibios_resource_survey_bus() and check_hotplug_bridge() get called only for a just found bus and not the ones already added to the system. Failure to do so will lead to resource conflicts. Signed-off-by: Kirill A. Shutemov Signed-off-by: Mika Westerberg --- drivers/pci/hotplug/acpiphp_glue.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index b983e29..80a6ea1 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -685,18 +685,13 @@ static int __ref enable_device(struct acpiphp_slot *slot) struct pci_dev *dev; struct pci_bus *bus = slot->bridge->pci_bus; struct acpiphp_func *func; - int num, max, pass; + int max, pass; LIST_HEAD(add_list); list_for_each_entry(func, &slot->funcs, sibling) acpiphp_bus_add(func); - num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); - if (num == 0) { - /* Maybe only part of funcs are added. */ - dbg("No new device found\n"); - goto err_exit; - } + pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); max = acpiphp_max_busnr(bus); for (pass = 0; pass < 2; pass++) { @@ -707,8 +702,11 @@ static int __ref enable_device(struct acpiphp_slot *slot) dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { max = pci_scan_bridge(bus, dev, max, pass); if (pass && dev->subordinate) { - check_hotplug_bridge(slot, dev); - pcibios_resource_survey_bus(dev->subordinate); + if (!dev->subordinate->is_added) { + check_hotplug_bridge(slot, dev); + pcibios_resource_survey_bus( + dev->subordinate); + } __pci_bus_size_bridges(dev->subordinate, &add_list); } @@ -742,8 +740,6 @@ static int __ref enable_device(struct acpiphp_slot *slot) } } - - err_exit: return 0; }