From patchwork Thu Aug 1 13:06:24 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yijing Wang X-Patchwork-Id: 2836978 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9D154C0319 for ; Thu, 1 Aug 2013 13:07:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 61C282028D for ; Thu, 1 Aug 2013 13:07:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 359292022A for ; Thu, 1 Aug 2013 13:07:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754394Ab3HANHG (ORCPT ); Thu, 1 Aug 2013 09:07:06 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:35951 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753532Ab3HANHF (ORCPT ); Thu, 1 Aug 2013 09:07:05 -0400 Received: from 172.24.2.119 (EHLO szxeml210-edg.china.huawei.com) ([172.24.2.119]) by szxrg02-dlp.huawei.com (MOS 4.3.4-GA FastPath queued) with ESMTP id BFK33531; Thu, 01 Aug 2013 21:06:57 +0800 (CST) Received: from SZXEML451-HUB.china.huawei.com (10.82.67.194) by szxeml210-edg.china.huawei.com (172.24.2.183) with Microsoft SMTP Server (TLS) id 14.1.323.7; Thu, 1 Aug 2013 21:06:54 +0800 Received: from localhost (10.135.76.69) by szxeml451-hub.china.huawei.com (10.82.67.194) with Microsoft SMTP Server id 14.1.323.7; Thu, 1 Aug 2013 21:06:49 +0800 From: Yijing Wang To: Bjorn Helgaas CC: , Hanjun Guo , , Yijing Wang , Paul Bolle , "Rafael J. Wysocki" , Oliver Neukum , Gu Zheng Subject: [PATCH -v4 1/6] PCI, pciehp: avoid add a device already exist before suspend during resume Date: Thu, 1 Aug 2013 21:06:24 +0800 Message-ID: <1375362389-26096-2-git-send-email-wangyijing@huawei.com> X-Mailer: git-send-email 1.7.11.msysgit.1 In-Reply-To: <1375362389-26096-1-git-send-email-wangyijing@huawei.com> References: <1375362389-26096-1-git-send-email-wangyijing@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.135.76.69] X-CFilter-Loop: Reflected Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-8.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham 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 Currently, pciehp_resume() try to hot add device if the slot adapter status return true. But if there are already some devices exist, namely list_empty(bus->devices) return false. We should not add the device again, because the device add action will fail. Also print some uncomfortable messages like this: pciehp 0000:00:1c.1:pcie04: Device 0000:03:00.0 already exists at 0000:03:00, cannot hot-add pciehp 0000:00:1c.1:pcie04: Cannot add device at 0000:03:00 Tested-by: Paul Bolle Signed-off-by: Yijing Wang Cc: Paul Bolle Cc: "Rafael J. Wysocki" Cc: Oliver Neukum Cc: Gu Zheng Cc: linux-pci@vger.kernel.org --- drivers/pci/hotplug/pciehp_core.c | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index 7d72c5e..7fe9dbd 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -300,6 +300,7 @@ static int pciehp_resume (struct pcie_device *dev) { struct controller *ctrl; struct slot *slot; + struct pci_bus *pbus = dev->port->subordinate; u8 status; ctrl = get_service_data(dev); @@ -311,10 +312,13 @@ static int pciehp_resume (struct pcie_device *dev) /* Check if slot is occupied */ pciehp_get_adapter_status(slot, &status); - if (status) - pciehp_enable_slot(slot); - else + if (status) { + if (list_empty(&pbus->devices)) + pciehp_enable_slot(slot); + } else if (!list_empty(&pbus->devices)) { pciehp_disable_slot(slot); + } + return 0; } #endif /* PM */