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author | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2015-04-22 19:36:06 +0300 |
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committer | Peter Huewe <peterhuewe@gmx.de> | 2015-10-19 01:01:19 +0200 |
commit | 37c1c04cca920de8a68285751b2c7b3d937ad50c (patch) | |
tree | 3765e559cc8cce4341f9e26400c23d0f1b1ee487 /fs/sysfs/group.c | |
parent | 399235dc6e95400a1322a9999e92073bc572f0c8 (diff) | |
download | linux-stable-37c1c04cca920de8a68285751b2c7b3d937ad50c.tar.gz linux-stable-37c1c04cca920de8a68285751b2c7b3d937ad50c.tar.bz2 linux-stable-37c1c04cca920de8a68285751b2c7b3d937ad50c.zip |
sysfs: added __compat_only_sysfs_link_entry_to_kobj()
Added a new function __compat_only_sysfs_link_group_to_kobj() that adds
a symlink from attribute or group to a kobject. This needed for
maintaining backwards compatibility with PPI attributes in the TPM
driver.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Diffstat (limited to 'fs/sysfs/group.c')
-rw-r--r-- | fs/sysfs/group.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 39a019936768..e1236594fffe 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -352,3 +352,47 @@ void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name, } } EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group); + +/** + * __compat_only_sysfs_link_entry_to_kobj - add a symlink to a kobject pointing + * to a group or an attribute + * @kobj: The kobject containing the group. + * @target_kobj: The target kobject. + * @target_name: The name of the target group or attribute. + */ +int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj, + struct kobject *target_kobj, + const char *target_name) +{ + struct kernfs_node *target; + struct kernfs_node *entry; + struct kernfs_node *link; + + /* + * We don't own @target_kobj and it may be removed at any time. + * Synchronize using sysfs_symlink_target_lock. See sysfs_remove_dir() + * for details. + */ + spin_lock(&sysfs_symlink_target_lock); + target = target_kobj->sd; + if (target) + kernfs_get(target); + spin_unlock(&sysfs_symlink_target_lock); + if (!target) + return -ENOENT; + + entry = kernfs_find_and_get(target_kobj->sd, target_name); + if (!entry) { + kernfs_put(target); + return -ENOENT; + } + + link = kernfs_create_link(kobj->sd, target_name, entry); + if (IS_ERR(link) && PTR_ERR(link) == -EEXIST) + sysfs_warn_dup(kobj->sd, target_name); + + kernfs_put(entry); + kernfs_put(target); + return IS_ERR(link) ? PTR_ERR(link) : 0; +} +EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj); |