linux-kernel - Re: [PATCH] pinctrl: stm32: Add check for clk

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Message-ID: <3c809cae-991b-4b13-8d8b-bd6cbcc9a9b9@denx.de>
Date: Thu, 5 Dec 2024 06:07:51 +0100
From: Marek Vasut <marex@...x.de>
To: Mingwei Zheng <zmw12306@...il.com>, linus.walleij@...aro.org,
 mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com, make24@...as.ac.cn,
 peng.fan@....com, fabien.dessenne@...s.st.com
Cc: linux-gpio@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Jiasheng Jiang <jiashengjiangcool@...il.com>
Subject: Re: [PATCH] pinctrl: stm32: Add check for clk_enable()

On 12/5/24 5:59 AM, Mingwei Zheng wrote:
> Add check for the return value of clk_enable() to catch the potential
> error. Add a cleanup loop to disable clocks already enabled in case
> of an error during clock enabling for subsequent banks.
> 
> Fixes: 05d8af449d93 ("pinctrl: stm32: Keep pinctrl block clock enabled when LEVEL IRQ requested")
> Signed-off-by: Mingwei Zheng <zmw12306@...il.com>
> Signed-off-by: Jiasheng Jiang <jiashengjiangcool@...il.com>
> ---
>   drivers/pinctrl/stm32/pinctrl-stm32.c | 12 +++++++++---
>   1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
> index 5b7fa77c1184..eb7b2f864d88 100644
> --- a/drivers/pinctrl/stm32/pinctrl-stm32.c
> +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
> @@ -1738,10 +1738,16 @@ int __maybe_unused stm32_pinctrl_resume(struct device *dev)
>   {
>   	struct stm32_pinctrl *pctl = dev_get_drvdata(dev);
>   	struct stm32_pinctrl_group *g = pctl->groups;
> -	int i;
> +	int i, j, ret;
>   
> -	for (i = 0; i < pctl->nbanks; i++)
> -		clk_enable(pctl->banks[i].clk);
> +	for (i = 0; i < pctl->nbanks; i++) {
> +		ret = clk_enable(pctl->banks[i].clk);
> +		if (ret) {
> +			for (j = 0; j < i; j++)

Instead of this open-coded loop, can you please convert the driver to 
clk_bulk*() API and then do simple clk_bulk_enable()/clk_bulk_disable() 
here and everywhere ?

Thank you