From cc05301fd54f3e166aedf24e39f6731c4dec0451 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 6 Jan 2014 14:18:24 +0800 Subject: iommu/vt-d: fix wrong return value of dmar_table_init() 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 Signed-off-by: Joerg Roedel --- drivers/iommu/dmar.c | 29 ++++++++++++++--------------- 1 file changed, 14 insertions(+), 15 deletions(-) (limited to 'drivers/iommu') diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 726cfe296d99..753c7ecf66a8 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) -- cgit v1.2.3