Re: [PATCH v4 02/13] liveupdate: avoid mixing cleanup guards with goto in luo_session_retrieve_fd

[Pasha Tatashin <pasha.tatashin@soleen.com>]

On 06-02 11:13, Mike Rapoport wrote:
> On Sat, 30 May 2026 22:19:27 +0000, Pasha Tatashin <pasha.tatashin@soleen.com> wrote:
> > diff --git a/kernel/liveupdate/luo_session.c b/kernel/liveupdate/luo_session.c
> > index 146414933977..8d9201c25412 100644
> > --- a/kernel/liveupdate/luo_session.c
> > +++ b/kernel/liveupdate/luo_session.c
> > @@ -291,25 +291,24 @@ static int luo_session_retrieve_fd(struct luo_session *session,
> >  	if (argp->fd < 0)
> >  		return argp->fd;
> >  
> > -	guard(mutex)(&session->mutex);
> > -	err = luo_retrieve_file(&session->file_set, argp->token, &file);
> > -	if (err < 0)
> > -		goto  err_put_fd;
> > +	scoped_guard(mutex, &session->mutex) {
> > +		err = luo_retrieve_file(&session->file_set, argp->token, &file);
> > +		if (err < 0) {
> > +			put_unused_fd(argp->fd);
> > +			return err;
> 
> I don't like piling up error handling inside if (err) statements.
> 
> As we only need the lock only for luo_retrieve_file() I think it's better
> drop the guard and use goto:
> 
> 
> 	mutex_lock(&session->mutex);
> 	err = luo_retrieve_file(&session->file_set, argp->token, &file);
> 	mutex_unlock(&session->mutex);
> 	if (err)
> 		...

ok, done.

> 
> -- 
> Sincerely yours,
> Mike.
>