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From:   Hsin-Yi Wang <hsinyi@chromium.org>
Date:   Tue, 30 Jul 2019 16:02:37 -0700
Message-ID: <CAJMQK-jQA6aeSMmrRKDeJz+mGDsu09=ywPv+kfuo26GhQJD4Ug@mail.gmail.com>
Subject: Re: [PATCH v3 3/5] OPP: Improve require-opps linking
To:     Saravana Kannan <saravanak@google.com>
Cc:     MyungJoo Ham <myungjoo.ham@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
        Stephen Boyd <sboyd@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Sibi Sankar <sibis@codeaurora.org>, kernel-team@android.com,
        linux-pm@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
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On Wed, Jul 17, 2019 at 10:23 PM Saravana Kannan <saravanak@google.com> wrote:

> -free_required_tables:
> -       _opp_table_free_required_tables(opp_table);
> -put_np:
> -       of_node_put(np);
> +       for (i = 0; i < src->required_opp_count; i++) {
> +               if (src->required_opp_tables[i])
> +                       continue;
> +
> +               req_np = of_parse_required_opp(src_opp->np, i);
> +               if (!req_np)
> +                       continue;
> +
> +               req_table = _find_table_of_opp_np(req_np);
Not yet tested in v4, but in v3:
In _find_table_of_opp_np(), there's a lockdep check:
lockdep_assert_held(&opp_table_lock);
which would lead to lockdep warnings.

Call trace:
_find_table_of_opp_np
_of_lazy_link_required_tables
dev_pm_opp_xlate_opp