linux-kernel - Re: [PATCH v2 02/16] thermal/core: Show a debug message when get

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Message-ID: <CAJZ5v0hSfXY3MnShyUdjT7FKot0eiYW1DhCQytTPOazYxSL8Mw@mail.gmail.com>
Date:   Wed, 22 Feb 2023 20:25:29 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rafael@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v2 02/16] thermal/core: Show a debug message when
 get_temp() fails

On Tue, Feb 21, 2023 at 7:07 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> The different thermal drivers are showing an error in case the
> get_temp() fails. Actually no traces should be displayed in the
> backend ops but in the call site of this ops.
>
> Furthermore, the message is often a dev_dbg message where the
> tz->device is used, thus using the internal of the structure from the
> driver.
>
> Show a debug message if the thermal_zone_get_temp() fails to read the
> sensor temperature, so code showing the message is factored out and
> the tz->device accesss is in the scope of the thermal core framework.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/thermal/thermal_helpers.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c
> index 0f648131b0b5..9558339f5633 100644
> --- a/drivers/thermal/thermal_helpers.c
> +++ b/drivers/thermal/thermal_helpers.c
> @@ -107,6 +107,9 @@ int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
>                         *temp = tz->emul_temperature;
>         }
>
> +       if (ret)
> +               dev_dbg(&tz->device, "Failed to get temperature: %d\n", ret);
> +
>         return ret;
>  }
>
> --
> 2.34.1
>