From patchwork Thu Oct 1 05:52:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 524770 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 10665140787 for ; Thu, 1 Oct 2015 15:59:05 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755355AbbJAF7C (ORCPT ); Thu, 1 Oct 2015 01:59:02 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:20403 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751098AbbJAFyL (ORCPT ); Thu, 1 Oct 2015 01:54:11 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id t915rvti017364 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 1 Oct 2015 05:53:58 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userv0021.oracle.com (8.13.8/8.13.8) with ESMTP id t915rvpK010949 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Thu, 1 Oct 2015 05:53:57 GMT Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by aserv0121.oracle.com (8.13.8/8.13.8) with ESMTP id t915rvTp016740; Thu, 1 Oct 2015 05:53:57 GMT Received: from linux-siqj.site (/10.154.161.115) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 30 Sep 2015 22:53:56 -0700 From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Wei Yang , TJ , Yijing Wang Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v6 11/53] PCI: Don't release sibling bridge resources during hotplug Date: Wed, 30 Sep 2015 22:52:45 -0700 Message-Id: <1443678807-786-12-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1443678807-786-1-git-send-email-yinghai@kernel.org> References: <1443678807-786-1-git-send-email-yinghai@kernel.org> X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On hotplug path, we can not touch sibling bridges that is outside of the slot. That could happen when BIOS does not assign some bridge BARs and later kernel can not assign resource to them in first try. Check if fail dev is the parent bridge, then just use subordinate bus instead use parent bus. Reported-by: Andreas Noever Signed-off-by: Yinghai Lu --- drivers/pci/setup-bus.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 8477cf5..6b6a4ed 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1811,10 +1811,16 @@ again: * Try to release leaf bridge's resources that doesn't fit resource of * child device under that bridge */ - list_for_each_entry(fail_res, &fail_head, list) - pci_bus_release_bridge_resources(fail_res->dev->bus, + list_for_each_entry(fail_res, &fail_head, list) { + struct pci_bus *bus = fail_res->dev->bus; + + if (fail_res->dev == bridge) + bus = bridge->subordinate; + + pci_bus_release_bridge_resources(bus, fail_res->flags & type_mask, whole_subtree); + } /* restore size and flags */ list_for_each_entry(fail_res, &fail_head, list) {