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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-03-15 05:14:29 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-03-15 05:14:29 +0300 |
| commit | ce8356335027d3929fbfae4127451adaf36e1cd4 (patch) | |
| tree | 8ac7d71d3b67a6138e811cd4d4e135d934233e47 /fs/configfs | |
| parent | 5fb3fb8aa22ff6e6da4018fd3ab3e30e2fdc5e53 (diff) | |
| parent | 09688c0166e76ce2fb85e86b9d99be8b0084cdf9 (diff) | |
| download | linux-ce8356335027d3929fbfae4127451adaf36e1cd4.tar.xz | |
Merge tag 'v5.17-rc8' into next
Sync up with mainline to again get the latest changes in HID subsystem.
Diffstat (limited to 'fs/configfs')
| -rw-r--r-- | fs/configfs/dir.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index d3cd2a94d1e8..d1f9d2632202 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -34,6 +34,14 @@ */ DEFINE_SPINLOCK(configfs_dirent_lock); +/* + * All of link_obj/unlink_obj/link_group/unlink_group require that + * subsys->su_mutex is held. + * But parent configfs_subsystem is NULL when config_item is root. + * Use this mutex when config_item is root. + */ +static DEFINE_MUTEX(configfs_subsystem_mutex); + static void configfs_d_iput(struct dentry * dentry, struct inode * inode) { @@ -1859,7 +1867,9 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys) group->cg_item.ci_name = group->cg_item.ci_namebuf; sd = root->d_fsdata; + mutex_lock(&configfs_subsystem_mutex); link_group(to_config_group(sd->s_element), group); + mutex_unlock(&configfs_subsystem_mutex); inode_lock_nested(d_inode(root), I_MUTEX_PARENT); @@ -1884,7 +1894,9 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys) inode_unlock(d_inode(root)); if (err) { + mutex_lock(&configfs_subsystem_mutex); unlink_group(group); + mutex_unlock(&configfs_subsystem_mutex); configfs_release_fs(); } put_fragment(frag); @@ -1931,7 +1943,9 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys) dput(dentry); + mutex_lock(&configfs_subsystem_mutex); unlink_group(group); + mutex_unlock(&configfs_subsystem_mutex); configfs_release_fs(); } |