> @@ -2353,10 +2338,18 @@ static int cgroup_file_open(struct inode *inode, struct file *file)
> WARN_ON_ONCE(cfe->css && cfe->css != css);
> cfe->css = css;
>
> - if (cft->open)
> + if (cft->open) {
> err = cft->open(inode, file);
> - else
> - err = single_open(file, cgroup_seqfile_show, cfe);
> + } else {
> + err = single_open_size(file, cgroup_seqfile_show, cfe,
> + sizeof(struct cgroup_open_file));
This is wrong.
I guess you wanted to use single_open_private(), which doesn't exist.
> + if (!err) {
> + struct seq_file *sf = file->private_data;
> + struct cgroup_open_file *of = sf->private;
> +
> + of->cfe = cfe;
> + }
> + }
>
> if (css->ss && err)
> css_put(css);
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