From patchwork Thu Aug 23 07:45:03 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Feng Tang X-Patchwork-Id: 1365121 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 5D6C63FCAE for ; Thu, 23 Aug 2012 07:50:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758046Ab2HWHug (ORCPT ); Thu, 23 Aug 2012 03:50:36 -0400 Received: from mga11.intel.com ([192.55.52.93]:26527 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752031Ab2HWHue convert rfc822-to-8bit (ORCPT ); Thu, 23 Aug 2012 03:50:34 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 23 Aug 2012 00:50:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,299,1344236400"; d="scan'208,223";a="212788215" Received: from feng-i7.sh.intel.com (HELO feng-i7) ([10.239.14.125]) by fmsmga002.fm.intel.com with ESMTP; 23 Aug 2012 00:50:32 -0700 Date: Thu, 23 Aug 2012 15:45:03 +0800 From: Feng Tang To: Bjorn Helgaas Cc: Fengguang Wu , "Paul E. McKenney" , Steven Rostedt , Avi Kivity , Steven Rostedt , LKML , "kvm@vger.kernel.org" , Kenji Kaneshige , Yinghai Lu , Subject: [PATCH 1/2] PCI: Use local parameter pci_device_id for pci_get_subsys/class() Message-ID: <20120823154503.15a45b14@feng-i7> In-Reply-To: References: <5017D19B.5080806@redhat.com> <1343738627.27983.30.camel@gandalf.stny.rr.com> <5017D4AB.3090107@redhat.com> <1343740419.27983.33.camel@gandalf.stny.rr.com> <20120731234336.GA5526@localhost> <1343778699.27983.70.camel@gandalf.stny.rr.com> <20120731235705.GW2422@linux.vnet.ibm.com> <1343779778.27983.73.camel@gandalf.stny.rr.com> <20120801001811.GX2422@linux.vnet.ibm.com> <20120801004319.GA7043@localhost> <20120822025008.GA8066@localhost> <20120822154908.2e6ef3c0@feng-i7> Organization: intel X-Mailer: Claws Mail 3.7.6 (GTK+ 2.22.0; i486-pc-linux-gnu) Mime-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From 57a28ee5e7662ca28ba4c793aa037d64bd082dee Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Wed, 22 Aug 2012 15:41:51 +0800 Subject: [PATCH 1/2] PCI: Use local parameter pci_device_id for pci_get_subsys/class() This fixes a kernel warning https://lkml.org/lkml/2012/7/31/682 pci_get_subsys() may get called in late system reboot stage, using a sleepable kmalloc() sounds fragile and will casue a kernel warning with my recent commmit 55c844a "x86/reboot: Fix a warning message triggered by stop_other_cpus()" which disable local interrupt in late system shutdown/reboot phase. Using a local parameter instead will fix it and make it eligible for calling forom atomic context. Do the same change for the pci_get_class() as suggeted by Bjorn Helgaas Bisected-by: Fengguang Wu Signed-off-by: Feng Tang Reviewed-by: Fengguang Wu --- drivers/pci/search.c | 35 +++++++++++------------------------ 1 files changed, 11 insertions(+), 24 deletions(-) diff --git a/drivers/pci/search.c b/drivers/pci/search.c index 993d4a0..78a08b1 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -245,8 +245,7 @@ struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device, unsigned int ss_vendor, unsigned int ss_device, struct pci_dev *from) { - struct pci_dev *pdev; - struct pci_device_id *id; + struct pci_device_id id; /* * pci_find_subsys() can be called on the ide_setup() path, @@ -257,18 +256,12 @@ struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device, if (unlikely(no_pci_devices())) return NULL; - id = kzalloc(sizeof(*id), GFP_KERNEL); - if (!id) - return NULL; - id->vendor = vendor; - id->device = device; - id->subvendor = ss_vendor; - id->subdevice = ss_device; - - pdev = pci_get_dev_by_id(id, from); - kfree(id); + id.vendor = vendor; + id.device = device; + id.subvendor = ss_vendor; + id.subdevice = ss_device; - return pdev; + return pci_get_dev_by_id(&id, from); } /** @@ -307,19 +300,13 @@ pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from) */ struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from) { - struct pci_dev *dev; - struct pci_device_id *id; + struct pci_device_id id; - id = kzalloc(sizeof(*id), GFP_KERNEL); - if (!id) - return NULL; - id->vendor = id->device = id->subvendor = id->subdevice = PCI_ANY_ID; - id->class_mask = PCI_ANY_ID; - id->class = class; + id.vendor = id.device = id.subvendor = id.subdevice = PCI_ANY_ID; + id.class_mask = PCI_ANY_ID; + id.class = class; - dev = pci_get_dev_by_id(id, from); - kfree(id); - return dev; + return pci_get_dev_by_id(&id, from); } /**