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| author | Tejun Heo <htejun@gmail.com> | 2007-07-31 12:15:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-08-22 23:35:34 +0200 |
| commit | 6cb52147b254373364a2fef5df8b4aa3739c8bb6 (patch) | |
| tree | 423fa52521460ac39169397f637e2d9d9a2c8dab /fs/sysfs/dir.c | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog (diff) | |
| download | linux-6cb52147b254373364a2fef5df8b4aa3739c8bb6.tar.xz linux-6cb52147b254373364a2fef5df8b4aa3739c8bb6.zip | |
sysfs: fix locking in sysfs_lookup() and sysfs_rename_dir()
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 <htejun@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/dir.c')
| -rw-r--r-- | 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 048e6054c2fd..83e76b3813c9 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); |