linux-kernel - Re: [PATCH] thermal: fix thermal_cooling_device

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Message-Id: <ABDAFCAB-8DF5-41A7-B1E0-4953A9BF32B3@gmail.com>
Date:   Mon, 26 Jul 2021 10:00:18 -0400
From:   Jean-François Dagenais <jeff.dagenais@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Amit Kucheria <amitk@...nel.org>,
        Lukasz Luba <lukasz.luba@....com>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] thermal: fix thermal_cooling_device_register() prototype

Good job.

> On Jul 22, 2021, at 05:06, Arnd Bergmann <arnd@...nel.org> wrote:
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> There are two pairs of declarations for thermal_cooling_device_register()
> and thermal_of_cooling_device_register(), and only one set was changed
> in a recent patch, so the other one now causes a compile-time warning:
> 
> drivers/net/wireless/mediatek/mt76/mt7915/init.c: In function 'mt7915_thermal_init':
> drivers/net/wireless/mediatek/mt76/mt7915/init.c:134:48: error: passing argument 1 of 'thermal_cooling_device_register' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
>  134 |         cdev = thermal_cooling_device_register(wiphy_name(wiphy), phy,
>      |                                                ^~~~~~~~~~~~~~~~~
> In file included from drivers/net/wireless/mediatek/mt76/mt7915/init.c:7:
> include/linux/thermal.h:407:39: note: expected 'char *' but argument is of type 'const char *'
>  407 | thermal_cooling_device_register(char *type, void *devdata,
>      |                                 ~~~~~~^~~~
> 
> Change the dummy helper functions to have the same arguments as the
> normal version.
> 
> Fixes: f991de53a8ab ("thermal: make device_register's type argument const")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Jean-Francois Dagenais <jeff.dagenais@...il.com>
> ---
> include/linux/thermal.h | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index d296f3b88fb9..8050d929a5b4 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -404,12 +404,13 @@ static inline void thermal_zone_device_unregister(
> 	struct thermal_zone_device *tz)
> { }
> static inline struct thermal_cooling_device *
> -thermal_cooling_device_register(char *type, void *devdata,
> +thermal_cooling_device_register(const char *type, void *devdata,
> 	const struct thermal_cooling_device_ops *ops)
> { return ERR_PTR(-ENODEV); }
> static inline struct thermal_cooling_device *
> thermal_of_cooling_device_register(struct device_node *np,
> -	char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
> +	const char *type, void *devdata,
> +	const struct thermal_cooling_device_ops *ops)
> { return ERR_PTR(-ENODEV); }
> static inline struct thermal_cooling_device *
> devm_thermal_of_cooling_device_register(struct device *dev,
> -- 
> 2.29.2
>