linux-kernel - Re: [PATCH v5 1/3] drivers/thermal/exynos: Refactor clk_sec initialization inside SOC-specific case

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 for Android: free password hash cracker in your pocket

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

Message-ID: <aAIIH7H1oQH8cf-6@mai.linaro.org>
Date: Fri, 18 Apr 2025 10:06:55 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Anand Moon <linux.amoon@...il.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	"open list:SAMSUNG THERMAL DRIVER" <linux-pm@...r.kernel.org>,
	"open list:SAMSUNG THERMAL DRIVER" <linux-samsung-soc@...r.kernel.org>,
	"moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:CLANG/LLVM BUILD SUPPORT:Keyword:b(?i:clang|llvm)b" <llvm@...ts.linux.dev>
Subject: Re: [PATCH v5 1/3] drivers/thermal/exynos: Refactor clk_sec
 initialization inside SOC-specific case

On Thu, Apr 10, 2025 at 12:07:48PM +0530, Anand Moon wrote:
> Refactor the initialization of the clk_sec clock to be inside the
> SOC_ARCH_EXYNOS5420_TRIMINFO case. It ensures that the clk_sec clock
> is only initialized for the specified SOC and not for other SOCs,
> thereby simplifying the code. The clk_sec clock is used by the TMU
> for GPU on the Exynos 542x platform.
> 
> Removed redundant IS_ERR() checks for the clk_sec clock since error
> handling is already managed internally by clk_unprepare() functions.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> v5: None
> v4: Fix the aligment of code clk for clk_prepare in proper if/else block.
>     update the commit for clk_sec used.
>     checked to goto clean up all the clks are proper.
>     drop IS_ERR() check for clk_sec.
> v3: improve the commit message.
> ---
>  drivers/thermal/samsung/exynos_tmu.c | 37 ++++++++++++++--------------
>  1 file changed, 18 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 47a99b3c5395..3657920de000 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -1037,29 +1037,30 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>  		return ret;
>  
>  	data->clk = devm_clk_get(dev, "tmu_apbif");
> -	if (IS_ERR(data->clk))
> +	if (IS_ERR(data->clk)) {
>  		return dev_err_probe(dev, PTR_ERR(data->clk), "Failed to get clock\n");

As this branch returns, the else block can be removed.

	if (IS_ERR(data->clk))
		return dev_err_probe(dev, PTR_ERR(data->clk), "Failed to get clock\n");

	ret = clk_prepare(data->clk);
	if (ret) {
		...
	}

May be worth to group both calls with devm_clk_get_enabled()

> -
> -	data->clk_sec = devm_clk_get(dev, "tmu_triminfo_apbif");
> -	if (IS_ERR(data->clk_sec)) {
> -		if (data->soc == SOC_ARCH_EXYNOS5420_TRIMINFO)
> -			return dev_err_probe(dev, PTR_ERR(data->clk_sec),
> -					     "Failed to get triminfo clock\n");
>  	} else {
> -		ret = clk_prepare(data->clk_sec);
> +		ret = clk_prepare(data->clk);
>  		if (ret) {
>  			dev_err(dev, "Failed to get clock\n");
>  			return ret;
>  		}
>  	}
>  
> -	ret = clk_prepare(data->clk);
> -	if (ret) {
> -		dev_err(dev, "Failed to get clock\n");
> -		goto err_clk_sec;
> -	}
> -
>  	switch (data->soc) {
> +	case SOC_ARCH_EXYNOS5420_TRIMINFO:
> +		data->clk_sec = devm_clk_get(dev, "tmu_triminfo_apbif");
> +		if (IS_ERR(data->clk_sec)) {
> +			ret = dev_err_probe(dev, PTR_ERR(data->clk_sec),
> +					    "Failed to get clk_sec clock\n");
> +			goto err_clk;
> +		}
> +		ret = clk_prepare(data->clk_sec);

Same comment, devm_clk_get_enabled()

> +		if (ret) {
> +			dev_err(dev, "Failed to prepare clk_sec clock\n");
> +			goto err_clk_sec;
> +		}
> +		break;
>  	case SOC_ARCH_EXYNOS5433:
>  	case SOC_ARCH_EXYNOS7:
>  		data->sclk = devm_clk_get(dev, "tmu_sclk");
> @@ -1112,11 +1113,10 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>  
>  err_sclk:
>  	clk_disable_unprepare(data->sclk);
> +err_clk_sec:
> +	clk_unprepare(data->clk_sec);
>  err_clk:
>  	clk_unprepare(data->clk);
> -err_clk_sec:
> -	if (!IS_ERR(data->clk_sec))
> -		clk_unprepare(data->clk_sec);

With devm_ variant those labels should go away

>  	return ret;
>  }
>  
> @@ -1128,8 +1128,7 @@ static void exynos_tmu_remove(struct platform_device *pdev)
>  
>  	clk_disable_unprepare(data->sclk);
>  	clk_unprepare(data->clk);
> -	if (!IS_ERR(data->clk_sec))
> -		clk_unprepare(data->clk_sec);
> +	clk_unprepare(data->clk_sec);
>  }
>  
>  #ifdef CONFIG_PM_SLEEP
> -- 
> 2.49.0
> 

-- 

 <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog