linux-kernel - Re: [PATCH v11] pwm: bcm2835: Allow PWM driver to be used in atomic context

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Message-ID: <fuku3b5ur6y4k4refd3vmeoenzjo6mwe3b3gtel34rhhhtvnsa@w4uktgbqsc3w>
Date: Fri, 22 Dec 2023 11:30:47 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Sean Young <sean@...s.org>, Thierry Reding <thierry.reding@...il.com>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>, 
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, linux-pwm@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11] pwm: bcm2835: Allow PWM driver to be used in atomic
 context

Hello Sean,

On Wed, Dec 20, 2023 at 02:24:25PM +0000, Sean Young wrote:
> @@ -151,8 +153,26 @@ static int bcm2835_pwm_probe(struct platform_device *pdev)
>  		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk),
>  				     "clock not found\n");
>  
> +	ret = clk_rate_exclusive_get(pc->clk);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "fail to get exclusive rate\n");
> +
> +	ret = devm_add_action_or_reset(&pdev->dev, devm_clk_rate_exclusive_put,
> +				       pc->clk);
> +	if (ret) {
> +		clk_rate_exclusive_put(pc->clk);

That clk_rate_exclusive_put() is wrong. If devm_add_action_or_reset()
fails that is already cared for.

Given that Thierry already applied this patch, getting this fixed in a
timely manner would be good.

> +		return ret;
> +	}
> +
> +	pc->rate = clk_get_rate(pc->clk);
> +	if (!pc->rate)
> +		return dev_err_probe(&pdev->dev, -EINVAL,
> +				     "failed to get clock rate\n");
> +
>  	pc->chip.dev = &pdev->dev;
>  	pc->chip.ops = &bcm2835_pwm_ops;
> +	pc->chip.atomic = true;
>  	pc->chip.npwm = 2;
>  
>  	platform_set_drvdata(pdev, pc);

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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