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@@ -427,6 +427,41 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
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}
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+/**
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+ * sysfs_chmod_file - update the modified mode value on an object attribute.
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+ * @kobj: object we're acting for.
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+ * @attr: attribute descriptor.
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+ * @mode: file permissions.
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+ *
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+ */
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+int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
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+{
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+ struct dentry *dir = kobj->dentry;
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+ struct dentry *victim;
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+ struct sysfs_dirent *sd;
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+ umode_t umode = (mode & S_IALLUGO) | S_IFREG;
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+ int res = -ENOENT;
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+
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+ down(&dir->d_inode->i_sem);
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+ victim = sysfs_get_dentry(dir, attr->name);
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+ if (!IS_ERR(victim)) {
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+ if (victim->d_inode &&
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+ (victim->d_parent->d_inode == dir->d_inode)) {
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+ sd = victim->d_fsdata;
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+ attr->mode = mode;
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+ sd->s_mode = umode;
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+ victim->d_inode->i_mode = umode;
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+ dput(victim);
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+ res = 0;
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+ }
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+ }
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+ up(&dir->d_inode->i_sem);
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+
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+ return res;
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+}
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+EXPORT_SYMBOL_GPL(sysfs_chmod_file);
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+
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+
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/**
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* sysfs_remove_file - remove an object attribute.
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* @kobj: object we're acting for.
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