linux-kernel - Re: [PATCH v3 78/79] media: rcar-vin: use pm_runtime_resume_and

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Date:   Tue, 27 Apr 2021 12:34:27 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Linuxarm <linuxarm@...wei.com>, mauro.chehab@...wei.com,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Subject: Re: [PATCH v3 78/79] media: rcar-vin: use pm_runtime_resume_and_get()

On Tue, Apr 27, 2021 at 12:28 PM Mauro Carvalho Chehab
<mchehab+huawei@...nel.org> wrote:
> Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> added pm_runtime_resume_and_get() in order to automatically handle
> dev->power.usage_count decrement on errors.
>
> Use the new API, in order to cleanup the error check logic.
>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> @@ -408,6 +408,12 @@ static void rcsi2_enter_standby(struct rcar_csi2 *priv)
>
>  static void rcsi2_exit_standby(struct rcar_csi2 *priv)
>  {
> +       /*
> +        * The code at rcsi2_enter_standby() assumes
> +        * inconditionally that PM runtime usage count was

unconditionally

> +        * incremented. So, it shouldn't use pm_runtime_resume_and_get()
> +        * here.
> +        */
>         pm_runtime_get_sync(priv->dev);
>         reset_control_deassert(priv->rstc);
>  }

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds