Re: [PATCH v3 78/79] media: rcar-vin: use pm_runtime_resume_and_get()

[Geert Uytterhoeven]

On Tue, Apr 27, 2021 at 12:28 PM Mauro Carvalho Chehab
<mchehab+huawei@xxxxxxxxxx> 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@xxxxxxxxxxxx>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>

Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

> --- 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@xxxxxxxxxxxxxx

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