From 3007e997de91ec59af39a3f9c91595b31ae6e08b Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 14 Jun 2007 04:27:23 +0900 Subject: sysfs: use sysfs_mutex to protect the sysfs_dirent tree As kobj sysfs dentries and inodes are gonna be made reclaimable, i_mutex can't be used to protect sysfs_dirent tree. Use sysfs_mutex globally instead. As the whole tree is protected with sysfs_mutex, there is no reason to keep sysfs_rename_sem. Drop it. While at it, add docbook comments to functions which require sysfs_mutex locking. Signed-off-by: Tejun Heo Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/inode.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) (limited to 'fs/sysfs/inode.c') diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index e4c23939fb3..d439c0b4bfc 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -277,20 +277,14 @@ void sysfs_drop_dentry(struct sysfs_dirent *sd) int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name) { - struct dentry *dir; struct sysfs_dirent **pos, *sd; int found = 0; if (!dir_sd) return -ENOENT; - dir = dir_sd->s_dentry; + mutex_lock(&sysfs_mutex); - if (dir->d_inode == NULL) - /* no inode means this hasn't been made visible yet */ - return -ENOENT; - - mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); for (pos = &dir_sd->s_children; *pos; pos = &(*pos)->s_sibling) { sd = *pos; @@ -304,7 +298,8 @@ int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name) break; } } - mutex_unlock(&dir->d_inode->i_mutex); + + mutex_unlock(&sysfs_mutex); if (!found) return -ENOENT; -- cgit v1.2.3