linux-kernel - Re: [PATCH v2 1/2] ASoC: meson: aiu: fix function pointer type mismatch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240214002257.bfp6wk5j3wsaq6f6@google.com>
Date: Wed, 14 Feb 2024 00:22:57 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Jerome Brunet <jbrunet@...libre.com>
Cc: Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>, alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: Re: [PATCH v2 1/2] ASoC: meson: aiu: fix function pointer type
 mismatch

Hi,

On Tue, Feb 13, 2024 at 10:58:03PM +0100, Jerome Brunet wrote:
> clang-16 warns about casting functions to incompatible types, as is done
> here to call clk_disable_unprepare:
>
> sound/soc/meson/aiu.c:243:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>   243 |                                        (void(*)(void *))clk_disable_unprepare,
>
> The pattern of getting, enabling and setting a disable callback for a
> clock can be replaced with devm_clk_get_enabled(), which also fixes
> this warning.
>
> Fixes: 6ae9ca9ce986 ("ASoC: meson: aiu: add i2s and spdif support")
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>

Silences the warning and makes the code more readable without adding any
new helpers. Awesome!

Reviewed-by: Justin Stitt <justinstitt@...gle.com>
> ---
>  sound/soc/meson/aiu.c | 19 ++++---------------
>  sound/soc/meson/aiu.h |  1 -
>  2 files changed, 4 insertions(+), 16 deletions(-)
>
> diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
> index 7109b81cc3d0..5d1419ed7a62 100644
> --- a/sound/soc/meson/aiu.c
> +++ b/sound/soc/meson/aiu.c
> @@ -212,11 +212,12 @@ static const char * const aiu_spdif_ids[] = {
>  static int aiu_clk_get(struct device *dev)
>  {
>  	struct aiu *aiu = dev_get_drvdata(dev);
> +	struct clk *pclk;
>  	int ret;
>
> -	aiu->pclk = devm_clk_get(dev, "pclk");
> -	if (IS_ERR(aiu->pclk))
> -		return dev_err_probe(dev, PTR_ERR(aiu->pclk), "Can't get the aiu pclk\n");
> +	pclk = devm_clk_get_enabled(dev, "pclk");
> +	if (IS_ERR(pclk))
> +		return dev_err_probe(dev, PTR_ERR(pclk), "Can't get the aiu pclk\n");
>
>  	aiu->spdif_mclk = devm_clk_get(dev, "spdif_mclk");
>  	if (IS_ERR(aiu->spdif_mclk))
> @@ -233,18 +234,6 @@ static int aiu_clk_get(struct device *dev)
>  	if (ret)
>  		return dev_err_probe(dev, ret, "Can't get the spdif clocks\n");
>
> -	ret = clk_prepare_enable(aiu->pclk);
> -	if (ret) {
> -		dev_err(dev, "peripheral clock enable failed\n");
> -		return ret;
> -	}
> -
> -	ret = devm_add_action_or_reset(dev,
> -				       (void(*)(void *))clk_disable_unprepare,
> -				       aiu->pclk);
> -	if (ret)
> -		dev_err(dev, "failed to add reset action on pclk");
> -
>  	return ret;
>  }
>
> diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
> index 393b6c2307e4..0f94c8bf6081 100644
> --- a/sound/soc/meson/aiu.h
> +++ b/sound/soc/meson/aiu.h
> @@ -33,7 +33,6 @@ struct aiu_platform_data {
>  };
>
>  struct aiu {
> -	struct clk *pclk;
>  	struct clk *spdif_mclk;
>  	struct aiu_interface i2s;
>  	struct aiu_interface spdif;
> --
> 2.43.0
>
Thanks
Justin