linux-kernel - Re: [PATCH v2] PM / Domains: Allow holes in genpd

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Message-ID: <CAPDyKFqA8Fevi3LivsypeXjmF979=eFBEE9Gd82iL06FzMACvg@mail.gmail.com>
Date:   Thu, 15 Sep 2016 16:16:25 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2] PM / Domains: Allow holes in genpd_data.domains array

On 15 September 2016 at 14:05, Tomeu Vizoso <tomeu.vizoso@...labora.com> wrote:
> In platforms such as Rockchip's, the array of domains isn't always
> filled without holes, as which domains are present depend on the
> particular SoC revision.
>
> By allowing holes to be in the array, such SoCs can still use a single
> set of constants to index the array of power domains.
>
> Fixes: 0159ec670763 ("PM / Domains: Verify the PM domain is present when adding a provider")
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> Cc: Jon Hunter <jonathanh@...dia.com>
> Cc: Heiko Stuebner <heiko@...ech.de>

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

Kind regards
Uffe

>
> ---
>
> v2: Also skip holes in the error path.
> ---
>  drivers/base/power/domain.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index b0cf46dcae73..83ae3d7d3fdd 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -1581,6 +1581,8 @@ int of_genpd_add_provider_onecell(struct device_node *np,
>         mutex_lock(&gpd_list_lock);
>
>         for (i = 0; i < data->num_domains; i++) {
> +               if (!data->domains[i])
> +                       continue;
>                 if (!pm_genpd_present(data->domains[i]))
>                         goto error;
>
> @@ -1598,6 +1600,8 @@ int of_genpd_add_provider_onecell(struct device_node *np,
>
>  error:
>         while (i--) {
> +               if (!data->domains[i])
> +                       continue;
>                 data->domains[i]->provider = NULL;
>                 data->domains[i]->has_provider = false;
>         }
> --
> 2.7.4
>