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

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Message-ID: <ZYVmzrRwgVOGinmy@gofer.mess.org>
Date: Fri, 22 Dec 2023 10:37:02 +0000
From: Sean Young <sean@...s.org>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Thierry Reding <thierry.reding@...il.com>,
	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

On Fri, Dec 22, 2023 at 11:30:47AM +0100, Uwe Kleine-König wrote:
> 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.

Yes, you're right. I missed that - should've checked.

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

I'll send out a patch shortly, thanks for catching.


Sean