From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754498Ab1LVIlR (ORCPT ); Thu, 22 Dec 2011 03:41:17 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:63828 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753536Ab1LVIlO (ORCPT ); Thu, 22 Dec 2011 03:41:14 -0500 Message-ID: <4EF2EDA7.4010004@cn.fujitsu.com> Date: Thu, 22 Dec 2011 16:43:19 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.9) Gecko/20100921 Fedora/3.1.4-1.fc14 Thunderbird/3.1.4 MIME-Version: 1.0 To: Tejun Heo CC: LKML , Cgroups Subject: [PATCH] cgroup: move a check to parse_cgroupfs_options() X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-12-22 16:40:24, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-12-22 16:40:26, Serialize complete at 2011-12-22 16:40:26 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Always check the validity of mount options in parse_cgroupfs_options(). No functional change. Signed-off-by: Li Zefan --- kernel/cgroup.c | 15 +++++++-------- 1 files changed, 7 insertions(+), 8 deletions(-) diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 4936d88..bdb7994 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1218,7 +1218,6 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts) (opts->subsys_bits & mask)) return -EINVAL; - /* Can't specify "none" and some subsystems */ if (opts->subsys_bits && opts->none) return -EINVAL; @@ -1231,6 +1230,13 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts) return -EINVAL; /* + * This can happen only when none of the subsystems is enabled + * in the system. + */ + if (!opts->subsys_bits && !opts->none) + return -EINVAL; + + /* * Grab references on all the modules we'll need, so the subsystems * don't dance around before rebind_subsystems attaches them. This may * take duplicate reference counts on a subsystem that's already used, @@ -1401,9 +1407,6 @@ static struct cgroupfs_root *cgroup_root_from_opts(struct cgroup_sb_opts *opts) { struct cgroupfs_root *root; - if (!opts->subsys_bits && !opts->none) - return NULL; - root = kzalloc(sizeof(*root), GFP_KERNEL); if (!root) return ERR_PTR(-ENOMEM); @@ -1442,10 +1445,6 @@ static int cgroup_set_super(struct super_block *sb, void *data) int ret; struct cgroup_sb_opts *opts = data; - /* If we don't have a new root, we can't set up a new sb */ - if (!opts->new_root) - return -EINVAL; - BUG_ON(!opts->subsys_bits && !opts->none); ret = set_anon_super(sb, NULL); -- 1.7.3.1