From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934621AbXHVWVz (ORCPT ); Wed, 22 Aug 2007 18:21:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934433AbXHVWVe (ORCPT ); Wed, 22 Aug 2007 18:21:34 -0400 Received: from cantor2.suse.de ([195.135.220.15]:45131 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934574AbXHVWVc (ORCPT ); Wed, 22 Aug 2007 18:21:32 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Tejun Heo , Greg Kroah-Hartman Subject: [PATCH 1/5] sysfs: fix locking in sysfs_lookup() and sysfs_rename_dir() Date: Wed, 22 Aug 2007 15:10:16 -0700 Message-Id: <1187820620110-git-send-email-gregkh@suse.de> X-Mailer: git-send-email 1.5.3.rc5 In-Reply-To: <20070822220747.GA30603@kroah.com> References: <20070822220747.GA30603@kroah.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Tejun Heo sd children list walking in sysfs_lookup() and sd renaming in sysfs_rename_dir() were left out during i_mutex -> sysfs_mutex conversion. Fix them. Signed-off-by: Tejun Heo Acked-by: Cornelia Huck Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/dir.c | 21 ++++++++++++--------- 1 files changed, 12 insertions(+), 9 deletions(-) diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 048e605..83e76b3 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -762,12 +762,15 @@ static int sysfs_count_nlink(struct sysfs_dirent *sd) static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { + struct dentry *ret = NULL; struct sysfs_dirent * parent_sd = dentry->d_parent->d_fsdata; struct sysfs_dirent * sd; struct bin_attribute *bin_attr; struct inode *inode; int found = 0; + mutex_lock(&sysfs_mutex); + for (sd = parent_sd->s_children; sd; sd = sd->s_sibling) { if (sysfs_type(sd) && !strcmp(sd->s_name, dentry->d_name.name)) { @@ -778,14 +781,14 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, /* no such entry */ if (!found) - return NULL; + goto out_unlock; /* attach dentry and inode */ inode = sysfs_get_inode(sd); - if (!inode) - return ERR_PTR(-ENOMEM); - - mutex_lock(&sysfs_mutex); + if (!inode) { + ret = ERR_PTR(-ENOMEM); + goto out_unlock; + } if (inode->i_state & I_NEW) { /* initialize inode according to type */ @@ -815,9 +818,9 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, sysfs_instantiate(dentry, inode); sysfs_attach_dentry(sd, dentry); + out_unlock: mutex_unlock(&sysfs_mutex); - - return NULL; + return ret; } const struct inode_operations sysfs_dir_inode_operations = { @@ -942,6 +945,8 @@ int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd, if (error) goto out_drop; + mutex_lock(&sysfs_mutex); + dup_name = sd->s_name; sd->s_name = new_name; @@ -949,8 +954,6 @@ int sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd, d_add(new_dentry, NULL); d_move(sd->s_dentry, new_dentry); - mutex_lock(&sysfs_mutex); - sysfs_unlink_sibling(sd); sysfs_get(new_parent_sd); sysfs_put(sd->s_parent); -- 1.5.3.rc5