From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Tue, 16 Jan 2007 16:41:16 +0000 (GMT) Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:62848 "EHLO ebiederm.dsl.xmission.com") by ftp.linux-mips.org with ESMTP id S20041436AbXAPQlM (ORCPT ); Tue, 16 Jan 2007 16:41:12 +0000 Received: from ebiederm.dsl.xmission.com (localhost [127.0.0.1]) by ebiederm.dsl.xmission.com (8.13.8/8.13.8/Debian-2) with ESMTP id l0GGecAd000949; Tue, 16 Jan 2007 09:40:38 -0700 Received: (from eric@localhost) by ebiederm.dsl.xmission.com (8.13.8/8.13.8/Submit) id l0GGebp4000948; Tue, 16 Jan 2007 09:40:37 -0700 From: "Eric W. Biederman" To: " Cc: , , , xfs-masters@oss.sgi.com, xfs@oss.sgi.com, linux-scsi@vger.kernel.org, James.Bottomley@SteelEye.com, minyard@acm.org, openipmi-developer@lists.sourceforge.net, , linux-mips@linux-mips.org, ralf@linux-mips.org, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, linux390@de.ibm.com, linux-390@vm.marist.edu, paulus@samba.org, linuxppc-dev@ozlabs.org, lethal@linux-sh.org, linuxsh-shmedia-dev@lists.sourceforge.net, , vojtech@suse.cz, clemens@ladisch.de, a.zummo@towertech.it, rtc-linux@googlegroups.com, linux-parport@lists.infradead.org, andrea@suse.de, tim@cyberelk.net, philb@gnu.org, aharkes@cs.cmu.edu, coda@cs.cmu.edu, codalist@TELEMANN.coda.cs.cmu.edu, aia21@cantab.net, linux-ntfs-dev@lists.sourceforge.net, mark.fasheh@oracle.com, kurt.hackel@oracle.com, "Eric W. Biederman" Subject: [PATCH 20/59] sysctl: cdrom Don't set de->owner Date: Tue, 16 Jan 2007 09:39:25 -0700 Message-Id: <11689656373737-git-send-email-ebiederm@xmission.com> X-Mailer: git-send-email 1.5.0.rc1.gb60d In-Reply-To: References: Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 13614 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ebiederm@xmission.com Precedence: bulk X-list: linux-mips From: Eric W. Biederman - unquoted There is no need for open files in /proc/sys/XXX to hold a reference count on the module that provides the file to prevent module unload races. While there is code active in the module p->used in the sysctl_table_header is incremented, preventing the sysctl from being unregisted. Once the sysctl is unregistered it cannot be found. Open files are also not a problem as they revalidate the sysctl information and bump p->used before accessing module code. So setting de->owner is unnecessary, makes for a bad example and gets in my way of removing ctl_table->de. Signed-off-by: Eric W. Biederman --- drivers/cdrom/cdrom.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c index f0a6801..14f72c4 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -3554,8 +3554,6 @@ static void cdrom_sysctl_register(void) return; cdrom_sysctl_header = register_sysctl_table(cdrom_root_table, 0); - if (cdrom_root_table->ctl_name && cdrom_root_table->child->de) - cdrom_root_table->child->de->owner = THIS_MODULE; /* set the defaults */ cdrom_sysctl_settings.autoclose = autoclose; -- 1.4.4.1.g278f From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:62848 "EHLO ebiederm.dsl.xmission.com") by ftp.linux-mips.org with ESMTP id S20041436AbXAPQlM (ORCPT ); Tue, 16 Jan 2007 16:41:12 +0000 From: "Eric W. Biederman" Subject: [PATCH 20/59] sysctl: cdrom Don't set de->owner Date: Tue, 16 Jan 2007 09:39:25 -0700 Message-ID: <11689656373737-git-send-email-ebiederm@xmission.com> In-Reply-To: References: Return-Path: Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org To: " Cc: linux-kernel@vger.kernel.org, containers@lists.osdl.org, netdev@vger.kernel.org, xfs-masters@oss.sgi.com, xfs@oss.sgi.com, linux-scsi@vger.kernel.org, James.Bottomley@SteelEye.com, minyard@acm.org, openipmi-developer@lists.sourceforge.net, tony.luck@intel.com, linux-mips@linux-mips.org, ralf@linux-mips.org, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, linux390@de.ibm.com, linux-390@vm.marist.edu, paulus@samba.org, linuxppc-dev@ozlabs.org, lethal@linux-sh.org, linuxsh-shmedia-dev@lists.sourceforge.net, ak@suse.de, vojtech@suse.cz, clemens@ladisch.de, a.zummo@towertech.it, rtc-linux@googlegroups.com, linux-parport@lists.infradead.org, andrea@suse.de, tim@cyberelk.net, philb@gnu.org, aharkes@cs.cmu.edu, coda@cs.cmu.edu, codalist@TELEMANN.coda.cs.cmu.edu, aia21@cantab.net, linux-ntfs-dev@lists.sourceforge.net, mark.fasheh@oracle.com, kurt.hackel@oracle.com, "Eric W. Biederman" Message-ID: <20070116163925.EOpT6Kt-DucYUOcVMZ0fe3LerKQ0FMD16hQkkzskLC4@z> From: Eric W. Biederman - unquoted There is no need for open files in /proc/sys/XXX to hold a reference count on the module that provides the file to prevent module unload races. While there is code active in the module p->used in the sysctl_table_header is incremented, preventing the sysctl from being unregisted. Once the sysctl is unregistered it cannot be found. Open files are also not a problem as they revalidate the sysctl information and bump p->used before accessing module code. So setting de->owner is unnecessary, makes for a bad example and gets in my way of removing ctl_table->de. Signed-off-by: Eric W. Biederman --- drivers/cdrom/cdrom.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c index f0a6801..14f72c4 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -3554,8 +3554,6 @@ static void cdrom_sysctl_register(void) return; cdrom_sysctl_header = register_sysctl_table(cdrom_root_table, 0); - if (cdrom_root_table->ctl_name && cdrom_root_table->child->de) - cdrom_root_table->child->de->owner = THIS_MODULE; /* set the defaults */ cdrom_sysctl_settings.autoclose = autoclose; -- 1.4.4.1.g278f