linux-kernel - Re: [PATCH v2] powercap: Adjust printing the constraint name with new line

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Date:   Mon, 23 Nov 2020 18:29:22 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v2] powercap: Adjust printing the constraint name with new line

On Tue, Nov 17, 2020 at 2:48 PM Lukasz Luba <lukasz.luba@....com> wrote:
>
> The constrain name has limit of size 30, which sometimes might be hit.
> When this happens the new line might get lost. Prevent this and set the
> max limit for name string length equal 29. This would result is proper
> string clamping (when needed) and storing '\n' at index 29 and '\0' at 30,
> so similarly as desired originally.
>
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
> Hi Rafael,
>
> It is based on top of you current pm/linux-next branch.
>
> Change log:
> v2:
> - switched to sprintf() with "%.*s\n" pattern
> v1 [1]
>
> Regards,
> Lukasz
>
> [1] https://lore.kernel.org/linux-pm/20201109172452.6923-1-lukasz.luba@arm.com/
>
>
>  drivers/powercap/powercap_sys.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/powercap/powercap_sys.c b/drivers/powercap/powercap_sys.c
> index 3f0b8e2ef3d4..f0654a932b37 100644
> --- a/drivers/powercap/powercap_sys.c
> +++ b/drivers/powercap/powercap_sys.c
> @@ -170,9 +170,8 @@ static ssize_t show_constraint_name(struct device *dev,
>         if (pconst && pconst->ops && pconst->ops->get_name) {
>                 name = pconst->ops->get_name(power_zone, id);
>                 if (name) {
> -                       snprintf(buf, POWERCAP_CONSTRAINT_NAME_LEN,
> -                                                               "%s\n", name);
> -                       buf[POWERCAP_CONSTRAINT_NAME_LEN] = '\0';
> +                       sprintf(buf, "%.*s\n", POWERCAP_CONSTRAINT_NAME_LEN - 1,
> +                               name);
>                         len = strlen(buf);
>                 }
>         }
> --

Applied as 5.11 material, thanks!