From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756500Ab3LFDVc (ORCPT ); Thu, 5 Dec 2013 22:21:32 -0500 Received: from mga03.intel.com ([143.182.124.21]:56623 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756179Ab3LFDV2 (ORCPT ); Thu, 5 Dec 2013 22:21:28 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.93,838,1378882800"; d="scan'208";a="325987007" From: Jiang Liu To: Joerg Roedel , David Woodhouse , Dan Williams , Vinod Koul , Ashok Raj , Yijing Wang , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: Jiang Liu , Tony Luck , Yinghai Lu , linux-pci@vger.kernel.org, dmaengine@vger.kernel.org Subject: [Patch Part1 V2 17/20] iommu/vt-d: fix wrong return value of dmar_table_init() Date: Fri, 6 Dec 2013 11:21:20 +0800 Message-Id: <1386300083-6882-18-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1386300083-6882-1-git-send-email-jiang.liu@linux.intel.com> References: <1386300083-6882-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If dmar_table_init() fails to detect DMAR table on the first call, it will return wrong result on following calls because it always sets dmar_table_initialized no matter if succeeds or fails to detect DMAR table. Signed-off-by: Jiang Liu --- drivers/iommu/dmar.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index a9d9d0f..b6b8a7f5 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -472,24 +472,23 @@ int __init dmar_table_init(void) static int dmar_table_initialized; int ret; - if (dmar_table_initialized) - return 0; - - dmar_table_initialized = 1; - - ret = parse_dmar_table(); - if (ret) { - if (ret != -ENODEV) - pr_info("parse DMAR table failure.\n"); - return ret; - } + if (dmar_table_initialized == 0) { + ret = parse_dmar_table(); + if (ret < 0) { + if (ret != -ENODEV) + pr_info("parse DMAR table failure.\n"); + } else if (list_empty(&dmar_drhd_units)) { + pr_info("No DMAR devices found\n"); + ret = -ENODEV; + } - if (list_empty(&dmar_drhd_units)) { - pr_info("No DMAR devices found\n"); - return -ENODEV; + if (ret < 0) + dmar_table_initialized = ret; + else + dmar_table_initialized = 1; } - return 0; + return dmar_table_initialized < 0 ? dmar_table_initialized : 0; } static void warn_invalid_dmar(u64 addr, const char *message) -- 1.7.10.4