From patchwork Sat Sep 15 00:48:40 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 184055 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 A7B922C0089 for ; Sat, 15 Sep 2012 10:50:37 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753229Ab2IOAsz (ORCPT ); Fri, 14 Sep 2012 20:48:55 -0400 Received: from rcsinet15.oracle.com ([148.87.113.117]:40943 "EHLO rcsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752871Ab2IOAsy (ORCPT ); Fri, 14 Sep 2012 20:48:54 -0400 Received: from acsinet21.oracle.com (acsinet21.oracle.com [141.146.126.237]) by rcsinet15.oracle.com (Sentrion-MTA-4.2.2/Sentrion-MTA-4.2.2) with ESMTP id q8F0mnaS015403 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sat, 15 Sep 2012 00:48:50 GMT Received: from acsmt358.oracle.com (acsmt358.oracle.com [141.146.40.158]) by acsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id q8F0mmdJ007166 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 15 Sep 2012 00:48:49 GMT Received: from abhmt120.oracle.com (abhmt120.oracle.com [141.146.116.72]) by acsmt358.oracle.com (8.12.11.20060308/8.12.11) with ESMTP id q8F0mm6T019496; Fri, 14 Sep 2012 19:48:48 -0500 Received: from linux-siqj.site (/10.132.126.191) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 14 Sep 2012 17:48:48 -0700 From: Yinghai Lu To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu , x86@kernel.org Subject: [PATCH] PCI, x86: fix default vga ref_count Date: Fri, 14 Sep 2012 17:48:40 -0700 Message-Id: <1347670122-25824-1-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org when __ARCH_HAS_VGA_DEFAULT_DEVICE is not defined, aka EFIFB is not used, for static path, vga_default setting is through vga_arbiter_add_pci_device. and for x86 pci_fixup_video, will skip that. because subsys_initcall(vga_arb_device_init) come first to call vga_arbiter_add_pci_device. for hotplug path, even vga_arbiter_add_pci_device is called via notifier, but it will check VGA_RSRC_LEGACY_MASK that is not set for hotplug path. So x86 pci_fixup_video will take over to call vga_set_default_device(). We need to hold one dev reference there. otherwise vga_arbiter_del_pci_device that does not check VGA_RSRC_LEGACY_MASK will call put_device and it will cause ref_count to decrease extra. that will have that device get deleted early wrongly. Signed-off-by: Yinghai Lu Cc: x86@kernel.org --- arch/x86/pci/fixup.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-2.6/arch/x86/pci/fixup.c =================================================================== --- linux-2.6.orig/arch/x86/pci/fixup.c +++ linux-2.6/arch/x86/pci/fixup.c @@ -349,8 +349,12 @@ static void __devinit pci_fixup_video(st if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW; dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n"); - if (!vga_default_device()) + if (!vga_default_device()) { +#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE + pdev = pci_dev_get(pdev); +#endif vga_set_default_device(pdev); + } } } DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,