linux-kernel - Re: [PATCH v3 3/3] PM: domains: Make of_genpd_add_subdomain() to return -EPROBE

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Message-ID: <CAPDyKFpKHQQjbeBdnx1AVHmYJFD0XaXSqps8XZUyCK_9VB5FeA@mail.gmail.com>
Date:   Mon, 18 Jan 2021 11:32:48 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] PM: domains: Make of_genpd_add_subdomain() to
 return -EPROBE_DEFER

On Mon, 18 Jan 2021 at 02:13, Dmitry Osipenko <digetx@...il.com> wrote:
>
> Driver of a power domain provider may not be ready at the time of
> of_genpd_add_subdomain() invocation. Make this function to return
> -EPROBE_DEFER instead of -ENOENT in order to remove a need from
> power domain drivers to handle the error code specially.
>
> Suggested-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

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

Kind regards
Uffe

> ---
>  drivers/base/power/domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 2ab77aa516eb..7ef6764ee30f 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2462,7 +2462,7 @@ int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
>  out:
>         mutex_unlock(&gpd_list_lock);
>
> -       return ret;
> +       return ret == -ENOENT ? -EPROBE_DEFER : ret;
>  }
>  EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
>
> --
> 2.29.2
>