linux-kernel - Re: [PATCH v3 1/3] thermal: prevent cooling device with no type to be registered

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Date:   Mon, 9 Dec 2019 13:11:25 +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 v3 1/3] thermal: prevent cooling device with no type to be registered

On Thu, Dec 5, 2019 at 12:50 PM Wei Wang <wvw@...gle.com> wrote:
>
> commit 54fa38cc2eda ("thermal: core: prevent zones with no types to be
> registered") added logic to prevent thermal zone with empty type to be
> registered. Similarly, there are APIs that rely on cdev->type.
> This patch prevents cooling device without valid type to be registered.
>
> Signed-off-by: Wei Wang <wvw@...gle.com>

Looks better now. Thanks.

Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
Tested-by: Amit Kucheria <amit.kucheria@...aro.org>

> ---
>  drivers/thermal/thermal_core.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index d4481cc8958f..974e2d91c30b 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -954,12 +954,22 @@ __thermal_cooling_device_register(struct device_node *np,
>         struct thermal_zone_device *pos = NULL;
>         int result;
>
> -       if (type && strlen(type) >= THERMAL_NAME_LENGTH)
> +       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 over %d chars: %s\n",
> +                       THERMAL_NAME_LENGTH, type);
> +               return ERR_PTR(-EINVAL);
> +       }
>
>         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
> -           !ops->set_cur_state)
> +           !ops->set_cur_state) {
> +               pr_err("Error: Cooling device missing callbacks: %s\n", type);
>                 return ERR_PTR(-EINVAL);
> +       }
>
>         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
>         if (!cdev)
> @@ -972,7 +982,7 @@ __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;
> --
> 2.24.0.393.g34dc348eaf-goog
>