linux-kernel - Re: [PATCH v2 1/2] thermal: fix and clean up tz and cdev registration

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Date:   Thu, 5 Dec 2019 09:43:36 +0530
From:   Amit Kucheria <amit.kucheria@...durent.com>
To:     Wei Wang <wvw@...gle.com>
Cc:     Wei Wang <wei.vince.wang@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] thermal: fix and clean up tz and cdev registration

Hi Wei,

On Thu, Dec 5, 2019 at 3:26 AM Wei Wang <wvw@...gle.com> wrote:
>
> Make cooling device registration behavior consistent with

Consistent how? Please add details.

> thermal zone. This patch also cleans up a unnecessary
> nullptr check.
>
> Signed-off-by: Wei Wang <wvw@...gle.com>
> ---
>  drivers/thermal/thermal_core.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index d4481cc8958f..64fbb59c2f44 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -954,8 +954,16 @@ __thermal_cooling_device_register(struct device_node *np,
>         struct thermal_zone_device *pos = NULL;
>         int result;
>
> -       if (type && strlen(type) >= THERMAL_NAME_LENGTH)
> -               return ERR_PTR(-EINVAL);
> +       if (!type || !type[0]) {
> +           pr_err("Error: No cooling device type defined\n");
> +           return ERR_PTR(-EINVAL);
> +       }
> +
> +       if (strlen(type) >= THERMAL_NAME_LENGTH) {
> +           pr_err("Error: Cooling device name (%s) too long, "
> +                  "should be under %d chars\n", type, THERMAL_NAME_LENGTH);

Consider fitting into a single greppable string as "Error: Cooling
device name over %d chars: %s\n"

> +           return ERR_PTR(-EINVAL);
> +       }
>
>         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
>             !ops->set_cur_state)
> @@ -972,7 +980,7 @@ __thermal_cooling_device_register(struct device_node *np,
>         }
>
>         cdev->id = result;
> -       strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
> +       strlcpy(cdev->type, type, sizeof(cdev->type));
>         mutex_init(&cdev->lock);
>         INIT_LIST_HEAD(&cdev->thermal_instances);
>         cdev->np = np;
> @@ -1250,7 +1258,7 @@ thermal_zone_device_register(const char *type, int trips, int mask,
>                 return ERR_PTR(-EINVAL);
>         }
>
> -       if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
> +       if (strlen(type) >= THERMAL_NAME_LENGTH) {
>                 pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n",
>                        type, THERMAL_NAME_LENGTH);
>                 return ERR_PTR(-EINVAL);
> --
> 2.24.0.393.g34dc348eaf-goog
>