linux-kernel - Re: [PATCH 2/5] OPP: Add _link_required

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Message-ID: <CAPDyKFp=k23RFjSvn1QYfZYF6-e5dkN1BT69oopRceyq2mLCmQ@mail.gmail.com>
Date:   Mon, 16 Oct 2023 12:11:35 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] OPP: Add _link_required_opps() to avoid code duplication

On Fri, 13 Oct 2023 at 10:48, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> Factor out _link_required_opps() to remove duplicate code. No functional
> change.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Kind regards
Uffe


> ---
>  drivers/opp/of.c | 62 ++++++++++++++++++++++--------------------------
>  1 file changed, 29 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/opp/of.c b/drivers/opp/of.c
> index 85e2af3d6a49..81fa27599d58 100644
> --- a/drivers/opp/of.c
> +++ b/drivers/opp/of.c
> @@ -296,24 +296,41 @@ void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp)
>         of_node_put(opp->np);
>  }
>
> +static int _link_required_opps(struct dev_pm_opp *opp,
> +                              struct opp_table *required_table, int index)
> +{
> +       struct device_node *np;
> +
> +       np = of_parse_required_opp(opp->np, index);
> +       if (unlikely(!np))
> +               return -ENODEV;
> +
> +       opp->required_opps[index] = _find_opp_of_np(required_table, np);
> +       of_node_put(np);
> +
> +       if (!opp->required_opps[index]) {
> +               pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
> +                      __func__, opp->np, index);
> +               return -ENODEV;
> +       }
> +
> +       return 0;
> +}
> +
>  /* Populate all required OPPs which are part of "required-opps" list */
>  static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
>                                        struct dev_pm_opp *opp)
>  {
> -       struct dev_pm_opp **required_opps;
>         struct opp_table *required_table;
> -       struct device_node *np;
>         int i, ret, count = opp_table->required_opp_count;
>
>         if (!count)
>                 return 0;
>
> -       required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);
> -       if (!required_opps)
> +       opp->required_opps = kcalloc(count, sizeof(*opp->required_opps), GFP_KERNEL);
> +       if (!opp->required_opps)
>                 return -ENOMEM;
>
> -       opp->required_opps = required_opps;
> -
>         for (i = 0; i < count; i++) {
>                 required_table = opp_table->required_opp_tables[i];
>
> @@ -321,21 +338,9 @@ static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
>                 if (IS_ERR_OR_NULL(required_table))
>                         continue;
>
> -               np = of_parse_required_opp(opp->np, i);
> -               if (unlikely(!np)) {
> -                       ret = -ENODEV;
> -                       goto free_required_opps;
> -               }
> -
> -               required_opps[i] = _find_opp_of_np(required_table, np);
> -               of_node_put(np);
> -
> -               if (!required_opps[i]) {
> -                       pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
> -                              __func__, opp->np, i);
> -                       ret = -ENODEV;
> +               ret = _link_required_opps(opp, required_table, i);
> +               if (ret)
>                         goto free_required_opps;
> -               }
>         }
>
>         return 0;
> @@ -350,22 +355,13 @@ static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
>  static int lazy_link_required_opps(struct opp_table *opp_table,
>                                    struct opp_table *new_table, int index)
>  {
> -       struct device_node *required_np;
>         struct dev_pm_opp *opp;
> +       int ret;
>
>         list_for_each_entry(opp, &opp_table->opp_list, node) {
> -               required_np = of_parse_required_opp(opp->np, index);
> -               if (unlikely(!required_np))
> -                       return -ENODEV;
> -
> -               opp->required_opps[index] = _find_opp_of_np(new_table, required_np);
> -               of_node_put(required_np);
> -
> -               if (!opp->required_opps[index]) {
> -                       pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
> -                              __func__, opp->np, index);
> -                       return -ENODEV;
> -               }
> +               ret = _link_required_opps(opp, new_table, index);
> +               if (ret)
> +                       return ret;
>         }
>
>         return 0;
> --
> 2.31.1.272.g89b43f80a514
>