linux-kernel - Re: [PATCH RESEND v7] pinctrl: stm32: Add check for clk

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Message-ID: <b2f2f1e6-a539-4d1b-876f-6715c126ac3e@denx.de>
Date: Sun, 29 Dec 2024 18:11:43 +0100
From: Marek Vasut <marex@...x.de>
To: Mingwei Zheng <zmw12306@...il.com>
Cc: antonio.borneo@...s.st.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, 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 RESEND v7] pinctrl: stm32: Add check for clk_enable()

On 12/24/24 9:06 PM, Mingwei Zheng wrote:

[...]

> @@ -1390,15 +1379,11 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
>   	err = gpiochip_add_data(&bank->gpio_chip, bank);

There is one other nasty problem here -- this gpiochip_add_data() needs 
to be undone (*) below, otherwise ...
...

> +	ret = clk_bulk_prepare_enable(banks, pctl->clks);
> +	if (ret) {
> +		dev_err(dev, "failed to prepare_enable clk (%d)\n", ret);
> +		return ret;
> +	}
> +
>   	for_each_gpiochip_node(dev, child) {
>   		ret = stm32_gpiolib_register_bank(pctl, child);

... if this stm32_gpiolib_register_bank() fails for second or later bank 
, then ...

>   		if (ret) {
>   			fwnode_handle_put(child);
> -
> -			for (i = 0; i < pctl->nbanks; i++)
> -				clk_disable_unprepare(pctl->banks[i].clk);
> -
> -			return ret;
> +			goto err_clk;
>   		}
>   
>   		pctl->nbanks++;
> @@ -1658,6 +1642,10 @@ int stm32_pctl_probe(struct platform_device *pdev)
>   	dev_info(dev, "Pinctrl STM32 initialized\n");
>   
>   	return 0;
> +
> +err_clk:
> +	clk_bulk_disable_unprepare(banks, pctl->clks);

... this clk_bulk_disable_unprepare() will disable all bank clocks, 
including the clocks for the banks which got successfully registered.

Before calling clk_bulk_disable_unprepare(), it is necessary to 
unregister the GPIO chips again, i.e.:

i = 0;
for_each_gpiochip_node(dev, child) {
   struct stm32_gpio_bank *bank = &pctl->banks[i];
   gpiochip_remove(*bank->gpio_chip);
}
clk_bulk_disable_unprepare(banks, pctl->clks);

Otherwise I think the patch is pretty good, thank you !