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| author | Tejun Heo <htejun@gmail.com> | 2007-06-14 04:27:23 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-11 16:09:08 -0700 |
| commit | 3007e997de91ec59af39a3f9c91595b31ae6e08b (patch) | |
| tree | 4ed4df3ef3a249d2a4b562e36876fc8d4a3fabd9 /fs/sysfs/inode.c | |
| parent | 5f9953237f684ea1778adb9d26162da00b282225 (diff) | |
| download | linux-3007e997de91ec59af39a3f9c91595b31ae6e08b.tar.gz linux-3007e997de91ec59af39a3f9c91595b31ae6e08b.tar.bz2 linux-3007e997de91ec59af39a3f9c91595b31ae6e08b.zip | |
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 <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/inode.c')
| -rw-r--r-- | fs/sysfs/inode.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index e4c23939fb36..d439c0b4bfce 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; |