linux-kernel - Re: [PATCH V3 3/3] thermal/drivers/cpu_cooling: cpufreq_cooling

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Date:   Wed, 26 Jun 2019 08:29:53 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rjw@...ysocki.net, edubezval@...il.com,
        linux-kernel@...r.kernel.org,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Javi Merino <javi.merino@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Keerthy <j-keerthy@...com>,
        "open list:THERMAL/CPU_COOLING" <linux-pm@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:TI BANDGAP AND THERMAL DRIVER" 
        <linux-omap@...r.kernel.org>
Subject: Re: [PATCH V3 3/3] thermal/drivers/cpu_cooling:
 cpufreq_cooling_register returns an int

On 25-06-19, 13:32, Daniel Lezcano wrote:
> It looks like after the changes in the patch the only reason for

which patch ? Instead of "patch" you should refer to the latest
changes in code, like "now that cpufreq_cooling_unregister() doesn't
accept cdev as an argument ....."

> returning (struct thermal_cooling_device *) from
> cpufreq_cooling_register() is error checking, but it would be much
> more straightforward to return int for this purpose.
> 
> Moreover, that would prevent the callers of it from doing incorrect
> things with the returned pointers (like using it to unregister the
> cooling device).
> 
> Replace the returned value an integer instead of a pointer to a

                             as ?

> thermal cooling device structure.
> 
> Suggested-by: Rafael J. Wysocki <rafael@...nel.org>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/thermal/cpu_cooling.c                 | 63 +++++++++----------
>  drivers/thermal/imx_thermal.c                 |  6 +-
>  .../ti-soc-thermal/ti-thermal-common.c        |  7 +--
>  include/linux/cpu_cooling.h                   | 16 ++---
>  4 files changed, 40 insertions(+), 52 deletions(-)

-- 
viresh